Manually import wpt/editing and wpt/selection/

third_party/WebKit/LayoutTests/imported/wpt/editing/include/implementation.js

+"use strict";
+
+var htmlNamespace = "http://www.w3.org/1999/xhtml";
+
+var cssStylingFlag = false;
+
+var defaultSingleLineContainerName = "div";
+
+// This is bad :(
+var globalRange = null;
+
+// Commands are stored in a dictionary where we call their actions and such
+var commands = {};
+
+///////////////////////////////////////////////////////////////////////////////
+////////////////////////////// Utility functions //////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+//@{
+
+function nextNode(node) {
+    if (node.hasChildNodes()) {
+        return node.firstChild;
+    }
+    return nextNodeDescendants(node);
+}
+
+function previousNode(node) {
+    if (node.previousSibling) {
+        node = node.previousSibling;
+        while (node.hasChildNodes()) {
+            node = node.lastChild;
+        }
+        return node;
+    }
+    if (node.parentNode
+    && node.parentNode.nodeType == Node.ELEMENT_NODE) {
+        return node.parentNode;
+    }
+    return null;
+}
+
+function nextNodeDescendants(node) {
+    while (node && !node.nextSibling) {
+        node = node.parentNode;
+    }
+    if (!node) {
+        return null;
+    }
+    return node.nextSibling;
+}
+
+/**
+ * Returns true if ancestor is an ancestor of descendant, false otherwise.
+ */
+function isAncestor(ancestor, descendant) {
+    return ancestor
+        && descendant
+        && Boolean(ancestor.compareDocumentPosition(descendant) & Node.DOCUMENT_POSITION_CONTAINED_BY);
+}
+
+/**
+ * Returns true if ancestor is an ancestor of or equal to descendant, false
+ * otherwise.
+ */
+function isAncestorContainer(ancestor, descendant) {
+    return (ancestor || descendant)
+        && (ancestor == descendant || isAncestor(ancestor, descendant));
+}
+
+/**
+ * Returns true if descendant is a descendant of ancestor, false otherwise.
+ */
+function isDescendant(descendant, ancestor) {
+    return ancestor
+        && descendant
+        && Boolean(ancestor.compareDocumentPosition(descendant) & Node.DOCUMENT_POSITION_CONTAINED_BY);
+}
+
+/**
+ * Returns true if node1 is before node2 in tree order, false otherwise.
+ */
+function isBefore(node1, node2) {
+    return Boolean(node1.compareDocumentPosition(node2) & Node.DOCUMENT_POSITION_FOLLOWING);
+}
+
+/**
+ * Returns true if node1 is after node2 in tree order, false otherwise.
+ */
+function isAfter(node1, node2) {
+    return Boolean(node1.compareDocumentPosition(node2) & Node.DOCUMENT_POSITION_PRECEDING);
+}
+
+function getAncestors(node) {
+    var ancestors = [];
+    while (node.parentNode) {
+        ancestors.unshift(node.parentNode);
+        node = node.parentNode;
+    }
+    return ancestors;
+}
+
+function getInclusiveAncestors(node) {
+    return getAncestors(node).concat(node);
+}
+
+function getDescendants(node) {
+    var descendants = [];
+    var stop = nextNodeDescendants(node);
+    while ((node = nextNode(node))
+    && node != stop) {
+        descendants.push(node);
+    }
+    return descendants;
+}
+
+function getInclusiveDescendants(node) {
+    return [node].concat(getDescendants(node));
+}
+
+function convertProperty(property) {
+    // Special-case for now
+    var map = {
+        "fontFamily": "font-family",
+        "fontSize": "font-size",
+        "fontStyle": "font-style",
+        "fontWeight": "font-weight",
+        "textDecoration": "text-decoration",
+    };
+    if (typeof map[property] != "undefined") {
+        return map[property];
+    }
+
+    return property;
+}
+
+// Return the <font size=X> value for the given CSS size, or undefined if there
+// is none.
+function cssSizeToLegacy(cssVal) {
+    return {
+        "x-small": 1,
+        "small": 2,
+        "medium": 3,
+        "large": 4,
+        "x-large": 5,
+        "xx-large": 6,
+        "xxx-large": 7
+    }[cssVal];
+}
+
+// Return the CSS size given a legacy size.
+function legacySizeToCss(legacyVal) {
+    return {
+        1: "x-small",
+        2: "small",
+        3: "medium",
+        4: "large",
+        5: "x-large",
+        6: "xx-large",
+        7: "xxx-large",
+    }[legacyVal];
+}
+
+// Opera 11 puts HTML elements in the null namespace, it seems.
+function isHtmlNamespace(ns) {
+    return ns === null
+        || ns === htmlNamespace;
+}
+
+// "the directionality" from HTML.  I don't bother caring about non-HTML
+// elements.
+//
+// "The directionality of an element is either 'ltr' or 'rtl', and is
+// determined as per the first appropriate set of steps from the following
+// list:"
+function getDirectionality(element) {
+    // "If the element's dir attribute is in the ltr state
+    //     The directionality of the element is 'ltr'."
+    if (element.dir == "ltr") {
+        return "ltr";
+    }
+
+    // "If the element's dir attribute is in the rtl state
+    //     The directionality of the element is 'rtl'."
+    if (element.dir == "rtl") {
+        return "rtl";
+    }
+
+    // "If the element's dir attribute is in the auto state
+    // "If the element is a bdi element and the dir attribute is not in a
+    // defined state (i.e. it is not present or has an invalid value)
+    //     [lots of complicated stuff]
+    //
+    // Skip this, since no browser implements it anyway.
+
+    // "If the element is a root element and the dir attribute is not in a
+    // defined state (i.e. it is not present or has an invalid value)
+    //     The directionality of the element is 'ltr'."
+    if (!isHtmlElement(element.parentNode)) {
+        return "ltr";
+    }
+
+    // "If the element has a parent element and the dir attribute is not in a
+    // defined state (i.e. it is not present or has an invalid value)
+    //     The directionality of the element is the same as the element's
+    //     parent element's directionality."
+    return getDirectionality(element.parentNode);
+}
+
+//@}
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////// DOM Range functions /////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+//@{
+
+function getNodeIndex(node) {
+    var ret = 0;
+    while (node.previousSibling) {
+        ret++;
+        node = node.previousSibling;
+    }
+    return ret;
+}
+
+// "The length of a Node node is the following, depending on node:
+//
+// ProcessingInstruction
+// DocumentType
+//   Always 0.
+// Text
+// Comment
+//   node's length.
+// Any other node
+//   node's childNodes's length."
+function getNodeLength(node) {
+    switch (node.nodeType) {
+        case Node.PROCESSING_INSTRUCTION_NODE:
+        case Node.DOCUMENT_TYPE_NODE:
+            return 0;
+
+        case Node.TEXT_NODE:
+        case Node.COMMENT_NODE:
+            return node.length;
+
+        default:
+            return node.childNodes.length;
+    }
+}
+
+/**
+ * The position of two boundary points relative to one another, as defined by
+ * DOM Range.
+ */
+function getPosition(nodeA, offsetA, nodeB, offsetB) {
+    // "If node A is the same as node B, return equal if offset A equals offset
+    // B, before if offset A is less than offset B, and after if offset A is
+    // greater than offset B."
+    if (nodeA == nodeB) {
+        if (offsetA == offsetB) {
+            return "equal";
+        }
+        if (offsetA < offsetB) {
+            return "before";
+        }
+        if (offsetA > offsetB) {
+            return "after";
+        }
+    }
+
+    // "If node A is after node B in tree order, compute the position of (node
+    // B, offset B) relative to (node A, offset A). If it is before, return
+    // after. If it is after, return before."
+    if (nodeB.compareDocumentPosition(nodeA) & Node.DOCUMENT_POSITION_FOLLOWING) {
+        var pos = getPosition(nodeB, offsetB, nodeA, offsetA);
+        if (pos == "before") {
+            return "after";
+        }
+        if (pos == "after") {
+            return "before";
+        }
+    }
+
+    // "If node A is an ancestor of node B:"
+    if (nodeB.compareDocumentPosition(nodeA) & Node.DOCUMENT_POSITION_CONTAINS) {
+        // "Let child equal node B."
+        var child = nodeB;
+
+        // "While child is not a child of node A, set child to its parent."
+        while (child.parentNode != nodeA) {
+            child = child.parentNode;
+        }
+
+        // "If the index of child is less than offset A, return after."
+        if (getNodeIndex(child) < offsetA) {
+            return "after";
+        }
+    }
+
+    // "Return before."
+    return "before";
+}
+
+/**
+ * Returns the furthest ancestor of a Node as defined by DOM Range.
+ */
+function getFurthestAncestor(node) {
+    var root = node;
+    while (root.parentNode != null) {
+        root = root.parentNode;
+    }
+    return root;
+}
+
+/**
+ * "contained" as defined by DOM Range: "A Node node is contained in a range
+ * range if node's furthest ancestor is the same as range's root, and (node, 0)
+ * is after range's start, and (node, length of node) is before range's end."
+ */
+function isContained(node, range) {
+    var pos1 = getPosition(node, 0, range.startContainer, range.startOffset);
+    var pos2 = getPosition(node, getNodeLength(node), range.endContainer, range.endOffset);
+
+    return getFurthestAncestor(node) == getFurthestAncestor(range.startContainer)
+        && pos1 == "after"
+        && pos2 == "before";
+}
+
+/**
+ * Return all nodes contained in range that the provided function returns true
+ * for, omitting any with an ancestor already being returned.
+ */
+function getContainedNodes(range, condition) {
+    if (typeof condition == "undefined") {
+        condition = function() { return true };
+    }
+    var node = range.startContainer;
+    if (node.hasChildNodes()
+    && range.startOffset < node.childNodes.length) {
+        // A child is contained
+        node = node.childNodes[range.startOffset];
+    } else if (range.startOffset == getNodeLength(node)) {
+        // No descendant can be contained
+        node = nextNodeDescendants(node);
+    } else {
+        // No children; this node at least can't be contained
+        node = nextNode(node);
+    }
+
+    var stop = range.endContainer;
+    if (stop.hasChildNodes()
+    && range.endOffset < stop.childNodes.length) {
+        // The node after the last contained node is a child
+        stop = stop.childNodes[range.endOffset];
+    } else {
+        // This node and/or some of its children might be contained
+        stop = nextNodeDescendants(stop);
+    }
+
+    var nodeList = [];
+    while (isBefore(node, stop)) {
+        if (isContained(node, range)
+        && condition(node)) {
+            nodeList.push(node);
+            node = nextNodeDescendants(node);
+            continue;
+        }
+        node = nextNode(node);
+    }
+    return nodeList;
+}
+
+/**
+ * As above, but includes nodes with an ancestor that's already been returned.
+ */
+function getAllContainedNodes(range, condition) {
+    if (typeof condition == "undefined") {
+        condition = function() { return true };
+    }
+    var node = range.startContainer;
+    if (node.hasChildNodes()
+    && range.startOffset < node.childNodes.length) {
+        // A child is contained
+        node = node.childNodes[range.startOffset];
+    } else if (range.startOffset == getNodeLength(node)) {
+        // No descendant can be contained
+        node = nextNodeDescendants(node);
+    } else {
+        // No children; this node at least can't be contained
+        node = nextNode(node);
+    }
+
+    var stop = range.endContainer;
+    if (stop.hasChildNodes()
+    && range.endOffset < stop.childNodes.length) {
+        // The node after the last contained node is a child
+        stop = stop.childNodes[range.endOffset];
+    } else {
+        // This node and/or some of its children might be contained
+        stop = nextNodeDescendants(stop);
+    }
+
+    var nodeList = [];
+    while (isBefore(node, stop)) {
+        if (isContained(node, range)
+        && condition(node)) {
+            nodeList.push(node);
+        }
+        node = nextNode(node);
+    }
+    return nodeList;
+}
+
+// Returns either null, or something of the form rgb(x, y, z), or something of
+// the form rgb(x, y, z, w) with w != 0.
+function normalizeColor(color) {
+    if (color.toLowerCase() == "currentcolor") {
+        return null;
+    }
+
+    if (normalizeColor.resultCache === undefined) {
+        normalizeColor.resultCache = {};
+    }
+
+    if (normalizeColor.resultCache[color] !== undefined) {
+        return normalizeColor.resultCache[color];
+    }
+
+    var originalColor = color;
+
+    var outerSpan = document.createElement("span");
+    document.body.appendChild(outerSpan);
+    outerSpan.style.color = "black";
+
+    var innerSpan = document.createElement("span");
+    outerSpan.appendChild(innerSpan);
+    innerSpan.style.color = color;
+    color = getComputedStyle(innerSpan).color;
+
+    if (color == "rgb(0, 0, 0)") {
+        // Maybe it's really black, maybe it's invalid.
+        outerSpan.color = "white";
+        color = getComputedStyle(innerSpan).color;
+        if (color != "rgb(0, 0, 0)") {
+            return normalizeColor.resultCache[originalColor] = null;
+        }
+    }
+
+    document.body.removeChild(outerSpan);
+
+    // I rely on the fact that browsers generally provide consistent syntax for
+    // getComputedStyle(), although it's not standardized.  There are only
+    // three exceptions I found:
+    if (/^rgba\([0-9]+, [0-9]+, [0-9]+, 1\)$/.test(color)) {
+        // IE10PP2 seems to do this sometimes.
+        return normalizeColor.resultCache[originalColor] =
+            color.replace("rgba", "rgb").replace(", 1)", ")");
+    }
+    if (color == "transparent") {
+        // IE10PP2, Firefox 7.0a2, and Opera 11.50 all return "transparent" if
+        // the specified value is "transparent".
+        return normalizeColor.resultCache[originalColor] =
+            "rgba(0, 0, 0, 0)";
+    }
+    // Chrome 15 dev adds way too many significant figures.  This isn't a full
+    // fix, it just fixes one case that comes up in tests.
+    color = color.replace(/, 0.496094\)$/, ", 0.5)");
+    return normalizeColor.resultCache[originalColor] = color;
+}
+
+// Returns either null, or something of the form #xxxxxx.
+function parseSimpleColor(color) {
+    color = normalizeColor(color);
+    var matches = /^rgb\(([0-9]+), ([0-9]+), ([0-9]+)\)$/.exec(color);
+    if (matches) {
+        return "#"
+            + parseInt(matches[1]).toString(16).replace(/^.$/, "0$&")
+            + parseInt(matches[2]).toString(16).replace(/^.$/, "0$&")
+            + parseInt(matches[3]).toString(16).replace(/^.$/, "0$&");
+    }
+    return null;
+}
+
+//@}
+
+//////////////////////////////////////////////////////////////////////////////
+/////////////////////////// Edit command functions ///////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+
+/////////////////////////////////////////////////
+///// Methods of the HTMLDocument interface /////
+/////////////////////////////////////////////////
+//@{
+
+var executionStackDepth = 0;
+
+// Helper function for common behavior.
+function editCommandMethod(command, range, callback) {
+    // Set up our global range magic, but only if we're the outermost function
+    if (executionStackDepth == 0 && typeof range != "undefined") {
+        globalRange = range;
+    } else if (executionStackDepth == 0) {
+        globalRange = null;
+        globalRange = getActiveRange();
+    }
+
+    executionStackDepth++;
+    try {
+        var ret = callback();
+    } catch(e) {
+        executionStackDepth--;
+        throw e;
+    }
+    executionStackDepth--;
+    return ret;
+}
+
+function myExecCommand(command, showUi, value, range) {
+    // "All of these methods must treat their command argument ASCII
+    // case-insensitively."
+    command = command.toLowerCase();
+
+    // "If only one argument was provided, let show UI be false."
+    //
+    // If range was passed, I can't actually detect how many args were passed
+    // . . .
+    if (arguments.length == 1
+    || (arguments.length >=4 && typeof showUi == "undefined")) {
+        showUi = false;
+    }
+
+    // "If only one or two arguments were provided, let value be the empty
+    // string."
+    if (arguments.length <= 2
+    || (arguments.length >=4 && typeof value == "undefined")) {
+        value = "";
+    }
+
+    return editCommandMethod(command, range, (function(command, showUi, value) { return function() {
+        // "If command is not supported or not enabled, return false."
+        if (!(command in commands) || !myQueryCommandEnabled(command)) {
+            return false;
+        }
+
+        // "Take the action for command, passing value to the instructions as an
+        // argument."
+        var ret = commands[command].action(value);
+
+        // Check for bugs
+        if (ret !== true && ret !== false) {
+            throw "execCommand() didn't return true or false: " + ret;
+        }
+
+        // "If the previous step returned false, return false."
+        if (ret === false) {
+            return false;
+        }
+
+        // "Return true."
+        return true;
+    }})(command, showUi, value));
+}
+
+function myQueryCommandEnabled(command, range) {
+    // "All of these methods must treat their command argument ASCII
+    // case-insensitively."
+    command = command.toLowerCase();
+
+    return editCommandMethod(command, range, (function(command) { return function() {
+        // "Return true if command is both supported and enabled, false
+        // otherwise."
+        if (!(command in commands)) {
+            return false;
+        }
+
+        // "Among commands defined in this specification, those listed in
+        // Miscellaneous commands are always enabled, except for the cut
+        // command and the paste command. The other commands defined here are
+        // enabled if the active range is not null, its start node is either
+        // editable or an editing host, its end node is either editable or an
+        // editing host, and there is some editing host that is an inclusive
+        // ancestor of both its start node and its end node."
+        return ["copy", "defaultparagraphseparator", "selectall", "stylewithcss",
+        "usecss"].indexOf(command) != -1
+            || (
+                getActiveRange() !== null
+                && (isEditable(getActiveRange().startContainer) || isEditingHost(getActiveRange().startContainer))
+                && (isEditable(getActiveRange().endContainer) || isEditingHost(getActiveRange().endContainer))
+                && (getInclusiveAncestors(getActiveRange().commonAncestorContainer).some(isEditingHost))
+            );
+    }})(command));
+}
+
+function myQueryCommandIndeterm(command, range) {
+    // "All of these methods must treat their command argument ASCII
+    // case-insensitively."
+    command = command.toLowerCase();
+
+    return editCommandMethod(command, range, (function(command) { return function() {
+        // "If command is not supported or has no indeterminacy, return false."
+        if (!(command in commands) || !("indeterm" in commands[command])) {
+            return false;
+        }
+
+        // "Return true if command is indeterminate, otherwise false."
+        return commands[command].indeterm();
+    }})(command));
+}
+
+function myQueryCommandState(command, range) {
+    // "All of these methods must treat their command argument ASCII
+    // case-insensitively."
+    command = command.toLowerCase();
+
+    return editCommandMethod(command, range, (function(command) { return function() {
+        // "If command is not supported or has no state, return false."
+        if (!(command in commands) || !("state" in commands[command])) {
+            return false;
+        }
+
+        // "If the state override for command is set, return it."
+        if (typeof getStateOverride(command) != "undefined") {
+            return getStateOverride(command);
+        }
+
+        // "Return true if command's state is true, otherwise false."
+        return commands[command].state();
+    }})(command));
+}
+
+// "When the queryCommandSupported(command) method on the HTMLDocument
+// interface is invoked, the user agent must return true if command is
+// supported, and false otherwise."
+function myQueryCommandSupported(command) {
+    // "All of these methods must treat their command argument ASCII
+    // case-insensitively."
+    command = command.toLowerCase();
+
+    return command in commands;
+}
+
+function myQueryCommandValue(command, range) {
+    // "All of these methods must treat their command argument ASCII
+    // case-insensitively."
+    command = command.toLowerCase();
+
+    return editCommandMethod(command, range, function() {
+        // "If command is not supported or has no value, return the empty string."
+        if (!(command in commands) || !("value" in commands[command])) {
+            return "";
+        }
+
+        // "If command is "fontSize" and its value override is set, convert the
+        // value override to an integer number of pixels and return the legacy
+        // font size for the result."
+        if (command == "fontsize"
+        && getValueOverride("fontsize") !== undefined) {
+            return getLegacyFontSize(getValueOverride("fontsize"));
+        }
+
+        // "If the value override for command is set, return it."
+        if (typeof getValueOverride(command) != "undefined") {
+            return getValueOverride(command);
+        }
+
+        // "Return command's value."
+        return commands[command].value();
+    });
+}
+//@}
+
+//////////////////////////////
+///// Common definitions /////
+//////////////////////////////
+//@{
+
+// "An HTML element is an Element whose namespace is the HTML namespace."
+//
+// I allow an extra argument to more easily check whether something is a
+// particular HTML element, like isHtmlElement(node, "OL").  It accepts arrays
+// too, like isHtmlElement(node, ["OL", "UL"]) to check if it's an ol or ul.
+function isHtmlElement(node, tags) {
+    if (typeof tags == "string") {
+        tags = [tags];
+    }
+    if (typeof tags == "object") {
+        tags = tags.map(function(tag) { return tag.toUpperCase() });
+    }
+    return node
+        && node.nodeType == Node.ELEMENT_NODE
+        && isHtmlNamespace(node.namespaceURI)
+        && (typeof tags == "undefined" || tags.indexOf(node.tagName) != -1);
+}
+
+// "A prohibited paragraph child name is "address", "article", "aside",
+// "blockquote", "caption", "center", "col", "colgroup", "dd", "details",
+// "dir", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer",
+// "form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hgroup", "hr", "li",
+// "listing", "menu", "nav", "ol", "p", "plaintext", "pre", "section",
+// "summary", "table", "tbody", "td", "tfoot", "th", "thead", "tr", "ul", or
+// "xmp"."
+var prohibitedParagraphChildNames = ["address", "article", "aside",
+    "blockquote", "caption", "center", "col", "colgroup", "dd", "details",
+    "dir", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer",
+    "form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hgroup", "hr", "li",
+    "listing", "menu", "nav", "ol", "p", "plaintext", "pre", "section",
+    "summary", "table", "tbody", "td", "tfoot", "th", "thead", "tr", "ul",
+    "xmp"];
+
+// "A prohibited paragraph child is an HTML element whose local name is a
+// prohibited paragraph child name."
+function isProhibitedParagraphChild(node) {
+    return isHtmlElement(node, prohibitedParagraphChildNames);
+}
+
+// "A block node is either an Element whose "display" property does not have
+// resolved value "inline" or "inline-block" or "inline-table" or "none", or a
+// Document, or a DocumentFragment."
+function isBlockNode(node) {
+    return node
+        && ((node.nodeType == Node.ELEMENT_NODE && ["inline", "inline-block", "inline-table", "none"].indexOf(getComputedStyle(node).display) == -1)
+        || node.nodeType == Node.DOCUMENT_NODE
+        || node.nodeType == Node.DOCUMENT_FRAGMENT_NODE);
+}
+
+// "An inline node is a node that is not a block node."
+function isInlineNode(node) {
+    return node && !isBlockNode(node);
+}
+
+// "An editing host is a node that is either an HTML element with a
+// contenteditable attribute set to the true state, or the HTML element child
+// of a Document whose designMode is enabled."
+function isEditingHost(node) {
+    return node
+        && isHtmlElement(node)
+        && (node.contentEditable == "true"
+        || (node.parentNode
+        && node.parentNode.nodeType == Node.DOCUMENT_NODE
+        && node.parentNode.designMode == "on"));
+}
+
+// "Something is editable if it is a node; it is not an editing host; it does
+// not have a contenteditable attribute set to the false state; its parent is
+// an editing host or editable; and either it is an HTML element, or it is an
+// svg or math element, or it is not an Element and its parent is an HTML
+// element."
+function isEditable(node) {
+    return node
+        && !isEditingHost(node)
+        && (node.nodeType != Node.ELEMENT_NODE || node.contentEditable != "false")
+        && (isEditingHost(node.parentNode) || isEditable(node.parentNode))
+        && (isHtmlElement(node)
+        || (node.nodeType == Node.ELEMENT_NODE && node.namespaceURI == "http://www.w3.org/2000/svg" && node.localName == "svg")
+        || (node.nodeType == Node.ELEMENT_NODE && node.namespaceURI == "http://www.w3.org/1998/Math/MathML" && node.localName == "math")
+        || (node.nodeType != Node.ELEMENT_NODE && isHtmlElement(node.parentNode)));
+}
+
+// Helper function, not defined in the spec
+function hasEditableDescendants(node) {
+    for (var i = 0; i < node.childNodes.length; i++) {
+        if (isEditable(node.childNodes[i])
+        || hasEditableDescendants(node.childNodes[i])) {
+            return true;
+        }
+    }
+    return false;
+}
+
+// "The editing host of node is null if node is neither editable nor an editing
+// host; node itself, if node is an editing host; or the nearest ancestor of
+// node that is an editing host, if node is editable."
+function getEditingHostOf(node) {
+    if (isEditingHost(node)) {
+        return node;
+    } else if (isEditable(node)) {
+        var ancestor = node.parentNode;
+        while (!isEditingHost(ancestor)) {
+            ancestor = ancestor.parentNode;
+        }
+        return ancestor;
+    } else {
+        return null;
+    }
+}
+
+// "Two nodes are in the same editing host if the editing host of the first is
+// non-null and the same as the editing host of the second."
+function inSameEditingHost(node1, node2) {
+    return getEditingHostOf(node1)
+        && getEditingHostOf(node1) == getEditingHostOf(node2);
+}
+
+// "A collapsed line break is a br that begins a line box which has nothing
+// else in it, and therefore has zero height."
+function isCollapsedLineBreak(br) {
+    if (!isHtmlElement(br, "br")) {
+        return false;
+    }
+
+    // Add a zwsp after it and see if that changes the height of the nearest
+    // non-inline parent.  Note: this is not actually reliable, because the
+    // parent might have a fixed height or something.
+    var ref = br.parentNode;
+    while (getComputedStyle(ref).display == "inline") {
+        ref = ref.parentNode;
+    }
+    var refStyle = ref.hasAttribute("style") ? ref.getAttribute("style") : null;
+    ref.style.height = "auto";
+    ref.style.maxHeight = "none";
+    ref.style.minHeight = "0";
+    var space = document.createTextNode("\u200b");
+    var origHeight = ref.offsetHeight;
+    if (origHeight == 0) {
+        throw "isCollapsedLineBreak: original height is zero, bug?";
+    }
+    br.parentNode.insertBefore(space, br.nextSibling);
+    var finalHeight = ref.offsetHeight;
+    space.parentNode.removeChild(space);
+    if (refStyle === null) {
+        // Without the setAttribute() line, removeAttribute() doesn't work in
+        // Chrome 14 dev.  I have no idea why.
+        ref.setAttribute("style", "");
+        ref.removeAttribute("style");
+    } else {
+        ref.setAttribute("style", refStyle);
+    }
+
+    // Allow some leeway in case the zwsp didn't create a whole new line, but
+    // only made an existing line slightly higher.  Firefox 6.0a2 shows this
+    // behavior when the first line is bold.
+    return origHeight < finalHeight - 5;
+}
+
+// "An extraneous line break is a br that has no visual effect, in that
+// removing it from the DOM would not change layout, except that a br that is
+// the sole child of an li is not extraneous."
+//
+// FIXME: This doesn't work in IE, since IE ignores display: none in
+// contenteditable.
+function isExtraneousLineBreak(br) {
+    if (!isHtmlElement(br, "br")) {
+        return false;
+    }
+
+    if (isHtmlElement(br.parentNode, "li")
+    && br.parentNode.childNodes.length == 1) {
+        return false;
+    }
+
+    // Make the line break disappear and see if that changes the block's
+    // height.  Yes, this is an absurd hack.  We have to reset height etc. on
+    // the reference node because otherwise its height won't change if it's not
+    // auto.
+    var ref = br.parentNode;
+    while (getComputedStyle(ref).display == "inline") {
+        ref = ref.parentNode;
+    }
+    var refStyle = ref.hasAttribute("style") ? ref.getAttribute("style") : null;
+    ref.style.height = "auto";
+    ref.style.maxHeight = "none";
+    ref.style.minHeight = "0";
+    var brStyle = br.hasAttribute("style") ? br.getAttribute("style") : null;
+    var origHeight = ref.offsetHeight;
+    if (origHeight == 0) {
+        throw "isExtraneousLineBreak: original height is zero, bug?";
+    }
+    br.setAttribute("style", "display:none");
+    var finalHeight = ref.offsetHeight;
+    if (refStyle === null) {
+        // Without the setAttribute() line, removeAttribute() doesn't work in
+        // Chrome 14 dev.  I have no idea why.
+        ref.setAttribute("style", "");
+        ref.removeAttribute("style");
+    } else {
+        ref.setAttribute("style", refStyle);
+    }
+    if (brStyle === null) {
+        br.removeAttribute("style");
+    } else {
+        br.setAttribute("style", brStyle);
+    }
+
+    return origHeight == finalHeight;
+}
+
+// "A whitespace node is either a Text node whose data is the empty string; or
+// a Text node whose data consists only of one or more tabs (0x0009), line
+// feeds (0x000A), carriage returns (0x000D), and/or spaces (0x0020), and whose
+// parent is an Element whose resolved value for "white-space" is "normal" or
+// "nowrap"; or a Text node whose data consists only of one or more tabs
+// (0x0009), carriage returns (0x000D), and/or spaces (0x0020), and whose
+// parent is an Element whose resolved value for "white-space" is "pre-line"."
+function isWhitespaceNode(node) {
+    return node
+        && node.nodeType == Node.TEXT_NODE
+        && (node.data == ""
+        || (
+            /^[\t\n\r ]+$/.test(node.data)
+            && node.parentNode
+            && node.parentNode.nodeType == Node.ELEMENT_NODE
+            && ["normal", "nowrap"].indexOf(getComputedStyle(node.parentNode).whiteSpace) != -1
+        ) || (
+            /^[\t\r ]+$/.test(node.data)
+            && node.parentNode
+            && node.parentNode.nodeType == Node.ELEMENT_NODE
+            && getComputedStyle(node.parentNode).whiteSpace == "pre-line"
+        ));
+}
+
+// "node is a collapsed whitespace node if the following algorithm returns
+// true:"
+function isCollapsedWhitespaceNode(node) {
+    // "If node is not a whitespace node, return false."
+    if (!isWhitespaceNode(node)) {
+        return false;
+    }
+
+    // "If node's data is the empty string, return true."
+    if (node.data == "") {
+        return true;
+    }
+
+    // "Let ancestor be node's parent."
+    var ancestor = node.parentNode;
+
+    // "If ancestor is null, return true."
+    if (!ancestor) {
+        return true;
+    }
+
+    // "If the "display" property of some ancestor of node has resolved value
+    // "none", return true."
+    if (getAncestors(node).some(function(ancestor) {
+        return ancestor.nodeType == Node.ELEMENT_NODE
+            && getComputedStyle(ancestor).display == "none";
+    })) {
+        return true;
+    }
+
+    // "While ancestor is not a block node and its parent is not null, set
+    // ancestor to its parent."
+    while (!isBlockNode(ancestor)
+    && ancestor.parentNode) {
+        ancestor = ancestor.parentNode;
+    }
+
+    // "Let reference be node."
+    var reference = node;
+
+    // "While reference is a descendant of ancestor:"
+    while (reference != ancestor) {
+        // "Let reference be the node before it in tree order."
+        reference = previousNode(reference);
+
+        // "If reference is a block node or a br, return true."
+        if (isBlockNode(reference)
+        || isHtmlElement(reference, "br")) {
+            return true;
+        }
+
+        // "If reference is a Text node that is not a whitespace node, or is an
+        // img, break from this loop."
+        if ((reference.nodeType == Node.TEXT_NODE && !isWhitespaceNode(reference))
+        || isHtmlElement(reference, "img")) {
+            break;
+        }
+    }
+
+    // "Let reference be node."
+    reference = node;
+
+    // "While reference is a descendant of ancestor:"
+    var stop = nextNodeDescendants(ancestor);
+    while (reference != stop) {
+        // "Let reference be the node after it in tree order, or null if there
+        // is no such node."
+        reference = nextNode(reference);
+
+        // "If reference is a block node or a br, return true."
+        if (isBlockNode(reference)
+        || isHtmlElement(reference, "br")) {
+            return true;
+        }
+
+        // "If reference is a Text node that is not a whitespace node, or is an
+        // img, break from this loop."
+        if ((reference && reference.nodeType == Node.TEXT_NODE && !isWhitespaceNode(reference))
+        || isHtmlElement(reference, "img")) {
+            break;
+        }
+    }
+
+    // "Return false."
+    return false;
+}
+
+// "Something is visible if it is a node that either is a block node, or a Text
+// node that is not a collapsed whitespace node, or an img, or a br that is not
+// an extraneous line break, or any node with a visible descendant; excluding
+// any node with an ancestor container Element whose "display" property has
+// resolved value "none"."
+function isVisible(node) {
+    if (!node) {
+        return false;
+    }
+
+    if (getAncestors(node).concat(node)
+    .filter(function(node) { return node.nodeType == Node.ELEMENT_NODE })
+    .some(function(node) { return getComputedStyle(node).display == "none" })) {
+        return false;
+    }
+
+    if (isBlockNode(node)
+    || (node.nodeType == Node.TEXT_NODE && !isCollapsedWhitespaceNode(node))
+    || isHtmlElement(node, "img")
+    || (isHtmlElement(node, "br") && !isExtraneousLineBreak(node))) {
+        return true;
+    }
+
+    for (var i = 0; i < node.childNodes.length; i++) {
+        if (isVisible(node.childNodes[i])) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+// "Something is invisible if it is a node that is not visible."
+function isInvisible(node) {
+    return node && !isVisible(node);
+}
+
+// "A collapsed block prop is either a collapsed line break that is not an
+// extraneous line break, or an Element that is an inline node and whose
+// children are all either invisible or collapsed block props and that has at
+// least one child that is a collapsed block prop."
+function isCollapsedBlockProp(node) {
+    if (isCollapsedLineBreak(node)
+    && !isExtraneousLineBreak(node)) {
+        return true;
+    }
+
+    if (!isInlineNode(node)
+    || node.nodeType != Node.ELEMENT_NODE) {
+        return false;
+    }
+
+    var hasCollapsedBlockPropChild = false;
+    for (var i = 0; i < node.childNodes.length; i++) {
+        if (!isInvisible(node.childNodes[i])
+        && !isCollapsedBlockProp(node.childNodes[i])) {
+            return false;
+        }
+        if (isCollapsedBlockProp(node.childNodes[i])) {
+            hasCollapsedBlockPropChild = true;
+        }
+    }
+
+    return hasCollapsedBlockPropChild;
+}
+
+// "The active range is the range of the selection given by calling
+// getSelection() on the context object. (Thus the active range may be null.)"
+//
+// We cheat and return globalRange if that's defined.  We also ensure that the
+// active range meets the requirements that selection boundary points are
+// supposed to meet, i.e., that the nodes are both Text or Element nodes that
+// descend from a Document.
+function getActiveRange() {
+    var ret;
+    if (globalRange) {
+        ret = globalRange;
+    } else if (getSelection().rangeCount) {
+        ret = getSelection().getRangeAt(0);
+    } else {
+        return null;
+    }
+    if ([Node.TEXT_NODE, Node.ELEMENT_NODE].indexOf(ret.startContainer.nodeType) == -1
+    || [Node.TEXT_NODE, Node.ELEMENT_NODE].indexOf(ret.endContainer.nodeType) == -1
+    || !ret.startContainer.ownerDocument
+    || !ret.endContainer.ownerDocument
+    || !isDescendant(ret.startContainer, ret.startContainer.ownerDocument)
+    || !isDescendant(ret.endContainer, ret.endContainer.ownerDocument)) {
+        throw "Invalid active range; test bug?";
+    }
+    return ret;
+}
+
+// "For some commands, each HTMLDocument must have a boolean state override
+// and/or a string value override. These do not change the command's state or
+// value, but change the way some algorithms behave, as specified in those
+// algorithms' definitions. Initially, both must be unset for every command.
+// Whenever the number of ranges in the Selection changes to something
+// different, and whenever a boundary point of the range at a given index in
+// the Selection changes to something different, the state override and value
+// override must be unset for every command."
+//
+// We implement this crudely by using setters and getters.  To verify that the
+// selection hasn't changed, we copy the active range and just check the
+// endpoints match.  This isn't really correct, but it's good enough for us.
+// Unset state/value overrides are undefined.  We put everything in a function
+// so no one can access anything except via the provided functions, since
+// otherwise callers might mistakenly use outdated overrides (if the selection
+// has changed).
+var getStateOverride, setStateOverride, unsetStateOverride,
+    getValueOverride, setValueOverride, unsetValueOverride;
+(function() {
+    var stateOverrides = {};
+    var valueOverrides = {};
+    var storedRange = null;
+
+    function resetOverrides() {
+        if (!storedRange
+        || storedRange.startContainer != getActiveRange().startContainer
+        || storedRange.endContainer != getActiveRange().endContainer
+        || storedRange.startOffset != getActiveRange().startOffset
+        || storedRange.endOffset != getActiveRange().endOffset) {
+            stateOverrides = {};
+            valueOverrides = {};
+            storedRange = getActiveRange().cloneRange();
+        }
+    }
+
+    getStateOverride = function(command) {
+        resetOverrides();
+        return stateOverrides[command];
+    };
+
+    setStateOverride = function(command, newState) {
+        resetOverrides();
+        stateOverrides[command] = newState;
+    };
+
+    unsetStateOverride = function(command) {
+        resetOverrides();
+        delete stateOverrides[command];
+    }
+
+    getValueOverride = function(command) {
+        resetOverrides();
+        return valueOverrides[command];
+    }
+
+    // "The value override for the backColor command must be the same as the
+    // value override for the hiliteColor command, such that setting one sets
+    // the other to the same thing and unsetting one unsets the other."
+    setValueOverride = function(command, newValue) {
+        resetOverrides();
+        valueOverrides[command] = newValue;
+        if (command == "backcolor") {
+            valueOverrides.hilitecolor = newValue;
+        } else if (command == "hilitecolor") {
+            valueOverrides.backcolor = newValue;
+        }
+    }
+
+    unsetValueOverride = function(command) {
+        resetOverrides();
+        delete valueOverrides[command];
+        if (command == "backcolor") {
+            delete valueOverrides.hilitecolor;
+        } else if (command == "hilitecolor") {
+            delete valueOverrides.backcolor;
+        }
+    }
+})();
+
+//@}
+
+/////////////////////////////
+///// Common algorithms /////
+/////////////////////////////
+
+///// Assorted common algorithms /////
+//@{
+
+// Magic array of extra ranges whose endpoints we want to preserve.
+var extraRanges = [];
+
+function movePreservingRanges(node, newParent, newIndex) {
+    // For convenience, I allow newIndex to be -1 to mean "insert at the end".
+    if (newIndex == -1) {
+        newIndex = newParent.childNodes.length;
+    }
+
+    // "When the user agent is to move a Node to a new location, preserving
+    // ranges, it must remove the Node from its original parent (if any), then
+    // insert it in the new location. In doing so, however, it must ignore the
+    // regular range mutation rules, and instead follow these rules:"
+
+    // "Let node be the moved Node, old parent and old index be the old parent
+    // (which may be null) and index, and new parent and new index be the new
+    // parent and index."
+    var oldParent = node.parentNode;
+    var oldIndex = getNodeIndex(node);
+
+    // We preserve the global range object, the ranges in the selection, and
+    // any range that's in the extraRanges array.  Any other ranges won't get
+    // updated, because we have no references to them.
+    var ranges = [globalRange].concat(extraRanges);
+    for (var i = 0; i < getSelection().rangeCount; i++) {
+        ranges.push(getSelection().getRangeAt(i));
+    }
+    var boundaryPoints = [];
+    ranges.forEach(function(range) {
+        boundaryPoints.push([range.startContainer, range.startOffset]);
+        boundaryPoints.push([range.endContainer, range.endOffset]);
+    });
+
+    boundaryPoints.forEach(function(boundaryPoint) {
+        // "If a boundary point's node is the same as or a descendant of node,
+        // leave it unchanged, so it moves to the new location."
+        //
+        // No modifications necessary.
+
+        // "If a boundary point's node is new parent and its offset is greater
+        // than new index, add one to its offset."
+        if (boundaryPoint[0] == newParent
+        && boundaryPoint[1] > newIndex) {
+            boundaryPoint[1]++;
+        }
+
+        // "If a boundary point's node is old parent and its offset is old index or
+        // old index + 1, set its node to new parent and add new index − old index
+        // to its offset."
+        if (boundaryPoint[0] == oldParent
+        && (boundaryPoint[1] == oldIndex
+        || boundaryPoint[1] == oldIndex + 1)) {
+            boundaryPoint[0] = newParent;
+            boundaryPoint[1] += newIndex - oldIndex;
+        }
+
+        // "If a boundary point's node is old parent and its offset is greater than
+        // old index + 1, subtract one from its offset."
+        if (boundaryPoint[0] == oldParent
+        && boundaryPoint[1] > oldIndex + 1) {
+            boundaryPoint[1]--;
+        }
+    });
+
+    // Now actually move it and preserve the ranges.
+    if (newParent.childNodes.length == newIndex) {
+        newParent.appendChild(node);
+    } else {
+        newParent.insertBefore(node, newParent.childNodes[newIndex]);
+    }
+
+    globalRange.setStart(boundaryPoints[0][0], boundaryPoints[0][1]);
+    globalRange.setEnd(boundaryPoints[1][0], boundaryPoints[1][1]);
+
+    for (var i = 0; i < extraRanges.length; i++) {
+        extraRanges[i].setStart(boundaryPoints[2*i + 2][0], boundaryPoints[2*i + 2][1]);
+        extraRanges[i].setEnd(boundaryPoints[2*i + 3][0], boundaryPoints[2*i + 3][1]);
+    }
+
+    getSelection().removeAllRanges();
+    for (var i = 1 + extraRanges.length; i < ranges.length; i++) {
+        var newRange = document.createRange();
+        newRange.setStart(boundaryPoints[2*i][0], boundaryPoints[2*i][1]);
+        newRange.setEnd(boundaryPoints[2*i + 1][0], boundaryPoints[2*i + 1][1]);
+        getSelection().addRange(newRange);
+    }
+}
+
+function setTagName(element, newName) {
+    // "If element is an HTML element with local name equal to new name, return
+    // element."
+    if (isHtmlElement(element, newName.toUpperCase())) {
+        return element;
+    }
+
+    // "If element's parent is null, return element."
+    if (!element.parentNode) {
+        return element;
+    }
+
+    // "Let replacement element be the result of calling createElement(new
+    // name) on the ownerDocument of element."
+    var replacementElement = element.ownerDocument.createElement(newName);
+
+    // "Insert replacement element into element's parent immediately before
+    // element."
+    element.parentNode.insertBefore(replacementElement, element);
+
+    // "Copy all attributes of element to replacement element, in order."
+    for (var i = 0; i < element.attributes.length; i++) {
+        replacementElement.setAttributeNS(element.attributes[i].namespaceURI, element.attributes[i].name, element.attributes[i].value);
+    }
+
+    // "While element has children, append the first child of element as the
+    // last child of replacement element, preserving ranges."
+    while (element.childNodes.length) {
+        movePreservingRanges(element.firstChild, replacementElement, replacementElement.childNodes.length);
+    }
+
+    // "Remove element from its parent."
+    element.parentNode.removeChild(element);
+
+    // "Return replacement element."
+    return replacementElement;
+}
+
+function removeExtraneousLineBreaksBefore(node) {
+    // "Let ref be the previousSibling of node."
+    var ref = node.previousSibling;
+
+    // "If ref is null, abort these steps."
+    if (!ref) {
+        return;
+    }
+
+    // "While ref has children, set ref to its lastChild."
+    while (ref.hasChildNodes()) {
+        ref = ref.lastChild;
+    }
+
+    // "While ref is invisible but not an extraneous line break, and ref does
+    // not equal node's parent, set ref to the node before it in tree order."
+    while (isInvisible(ref)
+    && !isExtraneousLineBreak(ref)
+    && ref != node.parentNode) {
+        ref = previousNode(ref);
+    }
+
+    // "If ref is an editable extraneous line break, remove it from its
+    // parent."
+    if (isEditable(ref)
+    && isExtraneousLineBreak(ref)) {
+        ref.parentNode.removeChild(ref);
+    }
+}
+
+function removeExtraneousLineBreaksAtTheEndOf(node) {
+    // "Let ref be node."
+    var ref = node;
+
+    // "While ref has children, set ref to its lastChild."
+    while (ref.hasChildNodes()) {
+        ref = ref.lastChild;
+    }
+
+    // "While ref is invisible but not an extraneous line break, and ref does
+    // not equal node, set ref to the node before it in tree order."
+    while (isInvisible(ref)
+    && !isExtraneousLineBreak(ref)
+    && ref != node) {
+        ref = previousNode(ref);
+    }
+
+    // "If ref is an editable extraneous line break:"
+    if (isEditable(ref)
+    && isExtraneousLineBreak(ref)) {
+        // "While ref's parent is editable and invisible, set ref to its
+        // parent."
+        while (isEditable(ref.parentNode)
+        && isInvisible(ref.parentNode)) {
+            ref = ref.parentNode;
+        }
+
+        // "Remove ref from its parent."
+        ref.parentNode.removeChild(ref);
+    }
+}
+
+// "To remove extraneous line breaks from a node, first remove extraneous line
+// breaks before it, then remove extraneous line breaks at the end of it."
+function removeExtraneousLineBreaksFrom(node) {
+    removeExtraneousLineBreaksBefore(node);
+    removeExtraneousLineBreaksAtTheEndOf(node);
+}
+
+//@}
+///// Wrapping a list of nodes /////
+//@{
+
+function wrap(nodeList, siblingCriteria, newParentInstructions) {
+    // "If not provided, sibling criteria returns false and new parent
+    // instructions returns null."
+    if (typeof siblingCriteria == "undefined") {
+        siblingCriteria = function() { return false };
+    }
+    if (typeof newParentInstructions == "undefined") {
+        newParentInstructions = function() { return null };
+    }
+
+    // "If every member of node list is invisible, and none is a br, return
+    // null and abort these steps."
+    if (nodeList.every(isInvisible)
+    && !nodeList.some(function(node) { return isHtmlElement(node, "br") })) {
+        return null;
+    }
+
+    // "If node list's first member's parent is null, return null and abort
+    // these steps."
+    if (!nodeList[0].parentNode) {
+        return null;
+    }
+
+    // "If node list's last member is an inline node that's not a br, and node
+    // list's last member's nextSibling is a br, append that br to node list."
+    if (isInlineNode(nodeList[nodeList.length - 1])
+    && !isHtmlElement(nodeList[nodeList.length - 1], "br")
+    && isHtmlElement(nodeList[nodeList.length - 1].nextSibling, "br")) {
+        nodeList.push(nodeList[nodeList.length - 1].nextSibling);
+    }
+
+    // "While node list's first member's previousSibling is invisible, prepend
+    // it to node list."
+    while (isInvisible(nodeList[0].previousSibling)) {
+        nodeList.unshift(nodeList[0].previousSibling);
+    }
+
+    // "While node list's last member's nextSibling is invisible, append it to
+    // node list."
+    while (isInvisible(nodeList[nodeList.length - 1].nextSibling)) {
+        nodeList.push(nodeList[nodeList.length - 1].nextSibling);
+    }
+
+    // "If the previousSibling of the first member of node list is editable and
+    // running sibling criteria on it returns true, let new parent be the
+    // previousSibling of the first member of node list."
+    var newParent;
+    if (isEditable(nodeList[0].previousSibling)
+    && siblingCriteria(nodeList[0].previousSibling)) {
+        newParent = nodeList[0].previousSibling;
+
+    // "Otherwise, if the nextSibling of the last member of node list is
+    // editable and running sibling criteria on it returns true, let new parent
+    // be the nextSibling of the last member of node list."
+    } else if (isEditable(nodeList[nodeList.length - 1].nextSibling)
+    && siblingCriteria(nodeList[nodeList.length - 1].nextSibling)) {
+        newParent = nodeList[nodeList.length - 1].nextSibling;
+
+    // "Otherwise, run new parent instructions, and let new parent be the
+    // result."
+    } else {
+        newParent = newParentInstructions();
+    }
+
+    // "If new parent is null, abort these steps and return null."
+    if (!newParent) {
+        return null;
+    }
+
+    // "If new parent's parent is null:"
+    if (!newParent.parentNode) {
+        // "Insert new parent into the parent of the first member of node list
+        // immediately before the first member of node list."
+        nodeList[0].parentNode.insertBefore(newParent, nodeList[0]);
+
+        // "If any range has a boundary point with node equal to the parent of
+        // new parent and offset equal to the index of new parent, add one to
+        // that boundary point's offset."
+        //
+        // Only try to fix the global range.
+        if (globalRange.startContainer == newParent.parentNode
+        && globalRange.startOffset == getNodeIndex(newParent)) {
+            globalRange.setStart(globalRange.startContainer, globalRange.startOffset + 1);
+        }
+        if (globalRange.endContainer == newParent.parentNode
+        && globalRange.endOffset == getNodeIndex(newParent)) {
+            globalRange.setEnd(globalRange.endContainer, globalRange.endOffset + 1);
+        }
+    }
+
+    // "Let original parent be the parent of the first member of node list."
+    var originalParent = nodeList[0].parentNode;
+
+    // "If new parent is before the first member of node list in tree order:"
+    if (isBefore(newParent, nodeList[0])) {
+        // "If new parent is not an inline node, but the last visible child of
+        // new parent and the first visible member of node list are both inline
+        // nodes, and the last child of new parent is not a br, call
+        // createElement("br") on the ownerDocument of new parent and append
+        // the result as the last child of new parent."
+        if (!isInlineNode(newParent)
+        && isInlineNode([].filter.call(newParent.childNodes, isVisible).slice(-1)[0])
+        && isInlineNode(nodeList.filter(isVisible)[0])
+        && !isHtmlElement(newParent.lastChild, "BR")) {
+            newParent.appendChild(newParent.ownerDocument.createElement("br"));
+        }
+
+        // "For each node in node list, append node as the last child of new
+        // parent, preserving ranges."
+        for (var i = 0; i < nodeList.length; i++) {
+            movePreservingRanges(nodeList[i], newParent, -1);
+        }
+
+    // "Otherwise:"
+    } else {
+        // "If new parent is not an inline node, but the first visible child of
+        // new parent and the last visible member of node list are both inline
+        // nodes, and the last member of node list is not a br, call
+        // createElement("br") on the ownerDocument of new parent and insert
+        // the result as the first child of new parent."
+        if (!isInlineNode(newParent)
+        && isInlineNode([].filter.call(newParent.childNodes, isVisible)[0])
+        && isInlineNode(nodeList.filter(isVisible).slice(-1)[0])
+        && !isHtmlElement(nodeList[nodeList.length - 1], "BR")) {
+            newParent.insertBefore(newParent.ownerDocument.createElement("br"), newParent.firstChild);
+        }
+
+        // "For each node in node list, in reverse order, insert node as the
+        // first child of new parent, preserving ranges."
+        for (var i = nodeList.length - 1; i >= 0; i--) {
+            movePreservingRanges(nodeList[i], newParent, 0);
+        }
+    }
+
+    // "If original parent is editable and has no children, remove it from its
+    // parent."
+    if (isEditable(originalParent) && !originalParent.hasChildNodes()) {
+        originalParent.parentNode.removeChild(originalParent);
+    }
+
+    // "If new parent's nextSibling is editable and running sibling criteria on
+    // it returns true:"
+    if (isEditable(newParent.nextSibling)
+    && siblingCriteria(newParent.nextSibling)) {
+        // "If new parent is not an inline node, but new parent's last child
+        // and new parent's nextSibling's first child are both inline nodes,
+        // and new parent's last child is not a br, call createElement("br") on
+        // the ownerDocument of new parent and append the result as the last
+        // child of new parent."
+        if (!isInlineNode(newParent)
+        && isInlineNode(newParent.lastChild)
+        && isInlineNode(newParent.nextSibling.firstChild)
+        && !isHtmlElement(newParent.lastChild, "BR")) {
+            newParent.appendChild(newParent.ownerDocument.createElement("br"));
+        }
+
+        // "While new parent's nextSibling has children, append its first child
+        // as the last child of new parent, preserving ranges."
+        while (newParent.nextSibling.hasChildNodes()) {
+            movePreservingRanges(newParent.nextSibling.firstChild, newParent, -1);
+        }
+
+        // "Remove new parent's nextSibling from its parent."
+        newParent.parentNode.removeChild(newParent.nextSibling);
+    }
+
+    // "Remove extraneous line breaks from new parent."
+    removeExtraneousLineBreaksFrom(newParent);
+
+    // "Return new parent."
+    return newParent;
+}
+
+
+//@}
+///// Allowed children /////
+//@{
+
+// "A name of an element with inline contents is "a", "abbr", "b", "bdi",
+// "bdo", "cite", "code", "dfn", "em", "h1", "h2", "h3", "h4", "h5", "h6", "i",
+// "kbd", "mark", "p", "pre", "q", "rp", "rt", "ruby", "s", "samp", "small",
+// "span", "strong", "sub", "sup", "u", "var", "acronym", "listing", "strike",
+// "xmp", "big", "blink", "font", "marquee", "nobr", or "tt"."
+var namesOfElementsWithInlineContents = ["a", "abbr", "b", "bdi", "bdo",
+    "cite", "code", "dfn", "em", "h1", "h2", "h3", "h4", "h5", "h6", "i",
+    "kbd", "mark", "p", "pre", "q", "rp", "rt", "ruby", "s", "samp", "small",
+    "span", "strong", "sub", "sup", "u", "var", "acronym", "listing", "strike",
+    "xmp", "big", "blink", "font", "marquee", "nobr", "tt"];
+
+// "An element with inline contents is an HTML element whose local name is a
+// name of an element with inline contents."
+function isElementWithInlineContents(node) {
+    return isHtmlElement(node, namesOfElementsWithInlineContents);
+}
+
+function isAllowedChild(child, parent_) {
+    // "If parent is "colgroup", "table", "tbody", "tfoot", "thead", "tr", or
+    // an HTML element with local name equal to one of those, and child is a
+    // Text node whose data does not consist solely of space characters, return
+    // false."
+    if ((["colgroup", "table", "tbody", "tfoot", "thead", "tr"].indexOf(parent_) != -1
+    || isHtmlElement(parent_, ["colgroup", "table", "tbody", "tfoot", "thead", "tr"]))
+    && typeof child == "object"
+    && child.nodeType == Node.TEXT_NODE
+    && !/^[ \t\n\f\r]*$/.test(child.data)) {
+        return false;
+    }
+
+    // "If parent is "script", "style", "plaintext", or "xmp", or an HTML
+    // element with local name equal to one of those, and child is not a Text
+    // node, return false."
+    if ((["script", "style", "plaintext", "xmp"].indexOf(parent_) != -1
+    || isHtmlElement(parent_, ["script", "style", "plaintext", "xmp"]))
+    && (typeof child != "object" || child.nodeType != Node.TEXT_NODE)) {
+        return false;
+    }
+
+    // "If child is a Document, DocumentFragment, or DocumentType, return
+    // false."
+    if (typeof child == "object"
+    && (child.nodeType == Node.DOCUMENT_NODE
+    || child.nodeType == Node.DOCUMENT_FRAGMENT_NODE
+    || child.nodeType == Node.DOCUMENT_TYPE_NODE)) {
+        return false;
+    }
+
+    // "If child is an HTML element, set child to the local name of child."
+    if (isHtmlElement(child)) {
+        child = child.tagName.toLowerCase();
+    }
+
+    // "If child is not a string, return true."
+    if (typeof child != "string") {
+        return true;
+    }
+
+    // "If parent is an HTML element:"
+    if (isHtmlElement(parent_)) {
+        // "If child is "a", and parent or some ancestor of parent is an a,
+        // return false."
+        //
+        // "If child is a prohibited paragraph child name and parent or some
+        // ancestor of parent is an element with inline contents, return
+        // false."
+        //
+        // "If child is "h1", "h2", "h3", "h4", "h5", or "h6", and parent or
+        // some ancestor of parent is an HTML element with local name "h1",
+        // "h2", "h3", "h4", "h5", or "h6", return false."
+        var ancestor = parent_;
+        while (ancestor) {
+            if (child == "a" && isHtmlElement(ancestor, "a")) {
+                return false;
+            }
+            if (prohibitedParagraphChildNames.indexOf(child) != -1
+            && isElementWithInlineContents(ancestor)) {
+                return false;
+            }
+            if (/^h[1-6]$/.test(child)
+            && isHtmlElement(ancestor)
+            && /^H[1-6]$/.test(ancestor.tagName)) {
+                return false;
+            }
+            ancestor = ancestor.parentNode;
+        }
+
+        // "Let parent be the local name of parent."
+        parent_ = parent_.tagName.toLowerCase();
+    }
+
+    // "If parent is an Element or DocumentFragment, return true."
+    if (typeof parent_ == "object"
+    && (parent_.nodeType == Node.ELEMENT_NODE
+    || parent_.nodeType == Node.DOCUMENT_FRAGMENT_NODE)) {
+        return true;
+    }
+
+    // "If parent is not a string, return false."
+    if (typeof parent_ != "string") {
+        return false;
+    }
+
+    // "If parent is on the left-hand side of an entry on the following list,
+    // then return true if child is listed on the right-hand side of that
+    // entry, and false otherwise."
+    switch (parent_) {
+        case "colgroup":
+            return child == "col";
+        case "table":
+            return ["caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"].indexOf(child) != -1;
+        case "tbody":
+        case "thead":
+        case "tfoot":
+            return ["td", "th", "tr"].indexOf(child) != -1;
+        case "tr":
+            return ["td", "th"].indexOf(child) != -1;
+        case "dl":
+            return ["dt", "dd"].indexOf(child) != -1;
+        case "dir":
+        case "ol":
+        case "ul":
+            return ["dir", "li", "ol", "ul"].indexOf(child) != -1;
+        case "hgroup":
+            return /^h[1-6]$/.test(child);
+    }
+
+    // "If child is "body", "caption", "col", "colgroup", "frame", "frameset",
+    // "head", "html", "tbody", "td", "tfoot", "th", "thead", or "tr", return
+    // false."
+    if (["body", "caption", "col", "colgroup", "frame", "frameset", "head",
+    "html", "tbody", "td", "tfoot", "th", "thead", "tr"].indexOf(child) != -1) {
+        return false;
+    }
+
+    // "If child is "dd" or "dt" and parent is not "dl", return false."
+    if (["dd", "dt"].indexOf(child) != -1
+    && parent_ != "dl") {
+        return false;
+    }
+
+    // "If child is "li" and parent is not "ol" or "ul", return false."
+    if (child == "li"
+    && parent_ != "ol"
+    && parent_ != "ul") {
+        return false;
+    }
+
+    // "If parent is on the left-hand side of an entry on the following list
+    // and child is listed on the right-hand side of that entry, return false."
+    var table = [
+        [["a"], ["a"]],
+        [["dd", "dt"], ["dd", "dt"]],
+        [["h1", "h2", "h3", "h4", "h5", "h6"], ["h1", "h2", "h3", "h4", "h5", "h6"]],
+        [["li"], ["li"]],
+        [["nobr"], ["nobr"]],
+        [namesOfElementsWithInlineContents, prohibitedParagraphChildNames],
+        [["td", "th"], ["caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"]],
+    ];
+    for (var i = 0; i < table.length; i++) {
+        if (table[i][0].indexOf(parent_) != -1
+        && table[i][1].indexOf(child) != -1) {
+            return false;
+        }
+    }
+
+    // "Return true."
+    return true;
+}
+
+
+//@}
+
+//////////////////////////////////////
+///// Inline formatting commands /////
+//////////////////////////////////////
+
+///// Inline formatting command definitions /////
+//@{
+
+// "A node node is effectively contained in a range range if range is not
+// collapsed, and at least one of the following holds:"
+function isEffectivelyContained(node, range) {
+    if (range.collapsed) {
+        return false;
+    }
+
+    // "node is contained in range."
+    if (isContained(node, range)) {
+        return true;
+    }
+
+    // "node is range's start node, it is a Text node, and its length is
+    // different from range's start offset."
+    if (node == range.startContainer
+    && node.nodeType == Node.TEXT_NODE
+    && getNodeLength(node) != range.startOffset) {
+        return true;
+    }
+
+    // "node is range's end node, it is a Text node, and range's end offset is
+    // not 0."
+    if (node == range.endContainer
+    && node.nodeType == Node.TEXT_NODE
+    && range.endOffset != 0) {
+        return true;
+    }
+
+    // "node has at least one child; and all its children are effectively
+    // contained in range; and either range's start node is not a descendant of
+    // node or is not a Text node or range's start offset is zero; and either
+    // range's end node is not a descendant of node or is not a Text node or
+    // range's end offset is its end node's length."
+    if (node.hasChildNodes()
+    && [].every.call(node.childNodes, function(child) { return isEffectivelyContained(child, range) })
+    && (!isDescendant(range.startContainer, node)
+    || range.startContainer.nodeType != Node.TEXT_NODE
+    || range.startOffset == 0)
+    && (!isDescendant(range.endContainer, node)
+    || range.endContainer.nodeType != Node.TEXT_NODE
+    || range.endOffset == getNodeLength(range.endContainer))) {
+        return true;
+    }
+
+    return false;
+}
+
+// Like get(All)ContainedNodes(), but for effectively contained nodes.
+function getEffectivelyContainedNodes(range, condition) {
+    if (typeof condition == "undefined") {
+        condition = function() { return true };
+    }
+    var node = range.startContainer;
+    while (isEffectivelyContained(node.parentNode, range)) {
+        node = node.parentNode;
+    }
+
+    var stop = nextNodeDescendants(range.endContainer);
+
+    var nodeList = [];
+    while (isBefore(node, stop)) {
+        if (isEffectivelyContained(node, range)
+        && condition(node)) {
+            nodeList.push(node);
+            node = nextNodeDescendants(node);
+            continue;
+        }
+        node = nextNode(node);
+    }
+    return nodeList;
+}
+
+function getAllEffectivelyContainedNodes(range, condition) {
+    if (typeof condition == "undefined") {
+        condition = function() { return true };
+    }
+    var node = range.startContainer;
+    while (isEffectivelyContained(node.parentNode, range)) {
+        node = node.parentNode;
+    }
+
+    var stop = nextNodeDescendants(range.endContainer);
+
+    var nodeList = [];
+    while (isBefore(node, stop)) {
+        if (isEffectivelyContained(node, range)
+        && condition(node)) {
+            nodeList.push(node);
+        }
+        node = nextNode(node);
+    }
+    return nodeList;
+}
+
+// "A modifiable element is a b, em, i, s, span, strong, sub, sup, or u element
+// with no attributes except possibly style; or a font element with no
+// attributes except possibly style, color, face, and/or size; or an a element
+// with no attributes except possibly style and/or href."
+function isModifiableElement(node) {
+    if (!isHtmlElement(node)) {
+        return false;
+    }
+
+    if (["B", "EM", "I", "S", "SPAN", "STRIKE", "STRONG", "SUB", "SUP", "U"].indexOf(node.tagName) != -1) {
+        if (node.attributes.length == 0) {
+            return true;
+        }
+
+        if (node.attributes.length == 1
+        && node.hasAttribute("style")) {
+            return true;
+        }
+    }
+
+    if (node.tagName == "FONT" || node.tagName == "A") {
+        var numAttrs = node.attributes.length;
+
+        if (node.hasAttribute("style")) {
+            numAttrs--;
+        }
+
+        if (node.tagName == "FONT") {
+            if (node.hasAttribute("color")) {
+                numAttrs--;
+            }
+
+            if (node.hasAttribute("face")) {
+                numAttrs--;
+            }
+
+            if (node.hasAttribute("size")) {
+                numAttrs--;
+            }
+        }
+
+        if (node.tagName == "A"
+        && node.hasAttribute("href")) {
+            numAttrs--;
+        }
+
+        if (numAttrs == 0) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+function isSimpleModifiableElement(node) {
+    // "A simple modifiable element is an HTML element for which at least one
+    // of the following holds:"
+    if (!isHtmlElement(node)) {
+        return false;
+    }
+
+    // Only these elements can possibly be a simple modifiable element.
+    if (["A", "B", "EM", "FONT", "I", "S", "SPAN", "STRIKE", "STRONG", "SUB", "SUP", "U"].indexOf(node.tagName) == -1) {
+        return false;
+    }
+
+    // "It is an a, b, em, font, i, s, span, strike, strong, sub, sup, or u
+    // element with no attributes."
+    if (node.attributes.length == 0) {
+        return true;
+    }
+
+    // If it's got more than one attribute, everything after this fails.
+    if (node.attributes.length > 1) {
+        return false;
+    }
+
+    // "It is an a, b, em, font, i, s, span, strike, strong, sub, sup, or u
+    // element with exactly one attribute, which is style, which sets no CSS
+    // properties (including invalid or unrecognized properties)."
+    //
+    // Not gonna try for invalid or unrecognized.
+    if (node.hasAttribute("style")
+    && node.style.length == 0) {
+        return true;
+    }
+
+    // "It is an a element with exactly one attribute, which is href."
+    if (node.tagName == "A"
+    && node.hasAttribute("href")) {
+        return true;
+    }
+
+    // "It is a font element with exactly one attribute, which is either color,
+    // face, or size."
+    if (node.tagName == "FONT"
+    && (node.hasAttribute("color")
+    || node.hasAttribute("face")
+    || node.hasAttribute("size")
+    )) {
+        return true;
+    }
+
+    // "It is a b or strong element with exactly one attribute, which is style,
+    // and the style attribute sets exactly one CSS property (including invalid
+    // or unrecognized properties), which is "font-weight"."
+    if ((node.tagName == "B" || node.tagName == "STRONG")
+    && node.hasAttribute("style")
+    && node.style.length == 1
+    && node.style.fontWeight != "") {
+        return true;
+    }
+
+    // "It is an i or em element with exactly one attribute, which is style,
+    // and the style attribute sets exactly one CSS property (including invalid
+    // or unrecognized properties), which is "font-style"."
+    if ((node.tagName == "I" || node.tagName == "EM")
+    && node.hasAttribute("style")
+    && node.style.length == 1
+    && node.style.fontStyle != "") {
+        return true;
+    }
+
+    // "It is an a, font, or span element with exactly one attribute, which is
+    // style, and the style attribute sets exactly one CSS property (including
+    // invalid or unrecognized properties), and that property is not
+    // "text-decoration"."
+    if ((node.tagName == "A" || node.tagName == "FONT" || node.tagName == "SPAN")
+    && node.hasAttribute("style")
+    && node.style.length == 1
+    && node.style.textDecoration == "") {
+        return true;
+    }
+
+    // "It is an a, font, s, span, strike, or u element with exactly one
+    // attribute, which is style, and the style attribute sets exactly one CSS
+    // property (including invalid or unrecognized properties), which is
+    // "text-decoration", which is set to "line-through" or "underline" or
+    // "overline" or "none"."
+    //
+    // The weird extra node.style.length check is for Firefox, which as of
+    // 8.0a2 has annoying and weird behavior here.
+    if (["A", "FONT", "S", "SPAN", "STRIKE", "U"].indexOf(node.tagName) != -1
+    && node.hasAttribute("style")
+    && (node.style.length == 1
+        || (node.style.length == 4
+            && "MozTextBlink" in node.style
+            && "MozTextDecorationColor" in node.style
+            && "MozTextDecorationLine" in node.style
+            && "MozTextDecorationStyle" in node.style)
+        || (node.style.length == 4
+            && "MozTextBlink" in node.style
+            && "textDecorationColor" in node.style
+            && "textDecorationLine" in node.style
+            && "textDecorationStyle" in node.style)
+    )
+    && (node.style.textDecoration == "line-through"
+    || node.style.textDecoration == "underline"
+    || node.style.textDecoration == "overline"
+    || node.style.textDecoration == "none")) {
+        return true;
+    }
+
+    return false;
+}
+
+// "A formattable node is an editable visible node that is either a Text node,
+// an img, or a br."
+function isFormattableNode(node) {
+    return isEditable(node)
+        && isVisible(node)
+        && (node.nodeType == Node.TEXT_NODE
+        || isHtmlElement(node, ["img", "br"]));
+}
+
+// "Two quantities are equivalent values for a command if either both are null,
+// or both are strings and they're equal and the command does not define any
+// equivalent values, or both are strings and the command defines equivalent
+// values and they match the definition."
+function areEquivalentValues(command, val1, val2) {
+    if (val1 === null && val2 === null) {
+        return true;
+    }
+
+    if (typeof val1 == "string"
+    && typeof val2 == "string"
+    && val1 == val2
+    && !("equivalentValues" in commands[command])) {
+        return true;
+    }
+
+    if (typeof val1 == "string"
+    && typeof val2 == "string"
+    && "equivalentValues" in commands[command]
+    && commands[command].equivalentValues(val1, val2)) {
+        return true;
+    }
+
+    return false;
+}
+
+// "Two quantities are loosely equivalent values for a command if either they
+// are equivalent values for the command, or if the command is the fontSize
+// command; one of the quantities is one of "x-small", "small", "medium",
+// "large", "x-large", "xx-large", or "xxx-large"; and the other quantity is
+// the resolved value of "font-size" on a font element whose size attribute has
+// the corresponding value set ("1" through "7" respectively)."
+function areLooselyEquivalentValues(command, val1, val2) {
+    if (areEquivalentValues(command, val1, val2)) {
+        return true;
+    }
+
+    if (command != "fontsize"
+    || typeof val1 != "string"
+    || typeof val2 != "string") {
+        return false;
+    }
+
+    // Static variables in JavaScript?
+    var callee = areLooselyEquivalentValues;
+    if (callee.sizeMap === undefined) {
+        callee.sizeMap = {};
+        var font = document.createElement("font");
+        document.body.appendChild(font);
+        ["x-small", "small", "medium", "large", "x-large", "xx-large",
+        "xxx-large"].forEach(function(keyword) {
+            font.size = cssSizeToLegacy(keyword);
+            callee.sizeMap[keyword] = getComputedStyle(font).fontSize;
+        });
+        document.body.removeChild(font);
+    }
+
+    return val1 === callee.sizeMap[val2]
+        || val2 === callee.sizeMap[val1];
+}
+
+//@}
+///// Assorted inline formatting command algorithms /////
+//@{
+
+function getEffectiveCommandValue(node, command) {
+    // "If neither node nor its parent is an Element, return null."
+    if (node.nodeType != Node.ELEMENT_NODE
+    && (!node.parentNode || node.parentNode.nodeType != Node.ELEMENT_NODE)) {
+        return null;
+    }
+
+    // "If node is not an Element, return the effective command value of its
+    // parent for command."
+    if (node.nodeType != Node.ELEMENT_NODE) {
+        return getEffectiveCommandValue(node.parentNode, command);
+    }
+
+    // "If command is "createLink" or "unlink":"
+    if (command == "createlink" || command == "unlink") {
+        // "While node is not null, and is not an a element that has an href
+        // attribute, set node to its parent."
+        while (node
+        && (!isHtmlElement(node)
+        || node.tagName != "A"
+        || !node.hasAttribute("href"))) {
+            node = node.parentNode;
+        }
+
+        // "If node is null, return null."
+        if (!node) {
+            return null;
+        }
+
+        // "Return the value of node's href attribute."
+        return node.getAttribute("href");
+    }
+
+    // "If command is "backColor" or "hiliteColor":"
+    if (command == "backcolor"
+    || command == "hilitecolor") {
+        // "While the resolved value of "background-color" on node is any
+        // fully transparent value, and node's parent is an Element, set
+        // node to its parent."
+        //
+        // Another lame hack to avoid flawed APIs.
+        while ((getComputedStyle(node).backgroundColor == "rgba(0, 0, 0, 0)"
+        || getComputedStyle(node).backgroundColor === ""
+        || getComputedStyle(node).backgroundColor == "transparent")
+        && node.parentNode
+        && node.parentNode.nodeType == Node.ELEMENT_NODE) {
+            node = node.parentNode;
+        }
+
+        // "Return the resolved value of "background-color" for node."
+        return getComputedStyle(node).backgroundColor;
+    }
+
+    // "If command is "subscript" or "superscript":"
+    if (command == "subscript" || command == "superscript") {
+        // "Let affected by subscript and affected by superscript be two
+        // boolean variables, both initially false."
+        var affectedBySubscript = false;
+        var affectedBySuperscript = false;
+
+        // "While node is an inline node:"
+        while (isInlineNode(node)) {
+            var verticalAlign = getComputedStyle(node).verticalAlign;
+
+            // "If node is a sub, set affected by subscript to true."
+            if (isHtmlElement(node, "sub")) {
+                affectedBySubscript = true;
+            // "Otherwise, if node is a sup, set affected by superscript to
+            // true."
+            } else if (isHtmlElement(node, "sup")) {
+                affectedBySuperscript = true;
+            }
+
+            // "Set node to its parent."
+            node = node.parentNode;
+        }
+
+        // "If affected by subscript and affected by superscript are both true,
+        // return the string "mixed"."
+        if (affectedBySubscript && affectedBySuperscript) {
+            return "mixed";
+        }
+
+        // "If affected by subscript is true, return "subscript"."
+        if (affectedBySubscript) {
+            return "subscript";
+        }
+
+        // "If affected by superscript is true, return "superscript"."
+        if (affectedBySuperscript) {
+            return "superscript";
+        }
+
+        // "Return null."
+        return null;
+    }
+
+    // "If command is "strikethrough", and the "text-decoration" property of
+    // node or any of its ancestors has resolved value containing
+    // "line-through", return "line-through". Otherwise, return null."
+    if (command == "strikethrough") {
+        do {
+            if (getComputedStyle(node).textDecoration.indexOf("line-through") != -1) {
+                return "line-through";
+            }
+            node = node.parentNode;
+        } while (node && node.nodeType == Node.ELEMENT_NODE);
+        return null;
+    }
+
+    // "If command is "underline", and the "text-decoration" property of node
+    // or any of its ancestors has resolved value containing "underline",
+    // return "underline". Otherwise, return null."
+    if (command == "underline") {
+        do {
+            if (getComputedStyle(node).textDecoration.indexOf("underline") != -1) {
+                return "underline";
+            }
+            node = node.parentNode;
+        } while (node && node.nodeType == Node.ELEMENT_NODE);
+        return null;
+    }
+
+    if (!("relevantCssProperty" in commands[command])) {
+        throw "Bug: no relevantCssProperty for " + command + " in getEffectiveCommandValue";
+    }
+
+    // "Return the resolved value for node of the relevant CSS property for
+    // command."
+    return getComputedStyle(node)[commands[command].relevantCssProperty];
+}
+
+function getSpecifiedCommandValue(element, command) {
+    // "If command is "backColor" or "hiliteColor" and element's display
+    // property does not have resolved value "inline", return null."
+    if ((command == "backcolor" || command == "hilitecolor")
+    && getComputedStyle(element).display != "inline") {
+        return null;
+    }
+
+    // "If command is "createLink" or "unlink":"
+    if (command == "createlink" || command == "unlink") {
+        // "If element is an a element and has an href attribute, return the
+        // value of that attribute."
+        if (isHtmlElement(element)
+        && element.tagName == "A"
+        && element.hasAttribute("href")) {
+            return element.getAttribute("href");
+        }
+
+        // "Return null."
+        return null;
+    }
+
+    // "If command is "subscript" or "superscript":"
+    if (command == "subscript" || command == "superscript") {
+        // "If element is a sup, return "superscript"."
+        if (isHtmlElement(element, "sup")) {
+            return "superscript";
+        }
+
+        // "If element is a sub, return "subscript"."
+        if (isHtmlElement(element, "sub")) {
+            return "subscript";
+        }
+
+        // "Return null."
+        return null;
+    }
+
+    // "If command is "strikethrough", and element has a style attribute set,
+    // and that attribute sets "text-decoration":"
+    if (command == "strikethrough"
+    && element.style.textDecoration != "") {
+        // "If element's style attribute sets "text-decoration" to a value
+        // containing "line-through", return "line-through"."
+        if (element.style.textDecoration.indexOf("line-through") != -1) {
+            return "line-through";
+        }
+
+        // "Return null."
+        return null;
+    }
+
+    // "If command is "strikethrough" and element is a s or strike element,
+    // return "line-through"."
+    if (command == "strikethrough"
+    && isHtmlElement(element, ["S", "STRIKE"])) {
+        return "line-through";
+    }
+
+    // "If command is "underline", and element has a style attribute set, and
+    // that attribute sets "text-decoration":"
+    if (command == "underline"
+    && element.style.textDecoration != "") {
+        // "If element's style attribute sets "text-decoration" to a value
+        // containing "underline", return "underline"."
+        if (element.style.textDecoration.indexOf("underline") != -1) {
+            return "underline";
+        }
+
+        // "Return null."
+        return null;
+    }
+
+    // "If command is "underline" and element is a u element, return
+    // "underline"."
+    if (command == "underline"
+    && isHtmlElement(element, "U")) {
+        return "underline";
+    }
+
+    // "Let property be the relevant CSS property for command."
+    var property = commands[command].relevantCssProperty;
+
+    // "If property is null, return null."
+    if (property === null) {
+        return null;
+    }
+
+    // "If element has a style attribute set, and that attribute has the
+    // effect of setting property, return the value that it sets property to."
+    if (element.style[property] != "") {
+        return element.style[property];
+    }
+
+    // "If element is a font element that has an attribute whose effect is
+    // to create a presentational hint for property, return the value that the
+    // hint sets property to.  (For a size of 7, this will be the non-CSS value
+    // "xxx-large".)"
+    if (isHtmlNamespace(element.namespaceURI)
+    && element.tagName == "FONT") {
+        if (property == "color" && element.hasAttribute("color")) {
+            return element.color;
+        }
+        if (property == "fontFamily" && element.hasAttribute("face")) {
+            return element.face;
+        }
+        if (property == "fontSize" && element.hasAttribute("size")) {
+            // This is not even close to correct in general.
+            var size = parseInt(element.size);
+            if (size < 1) {
+                size = 1;
+            }
+            if (size > 7) {
+                size = 7;
+            }
+            return {
+                1: "x-small",
+                2: "small",
+                3: "medium",
+                4: "large",
+                5: "x-large",
+                6: "xx-large",
+                7: "xxx-large"
+            }[size];
+        }
+    }
+
+    // "If element is in the following list, and property is equal to the
+    // CSS property name listed for it, return the string listed for it."
+    //
+    // A list follows, whose meaning is copied here.
+    if (property == "fontWeight"
+    && (element.tagName == "B" || element.tagName == "STRONG")) {
+        return "bold";
+    }
+    if (property == "fontStyle"
+    && (element.tagName == "I" || element.tagName == "EM")) {
+        return "italic";
+    }
+
+    // "Return null."
+    return null;
+}
+
+function reorderModifiableDescendants(node, command, newValue) {
+    // "Let candidate equal node."
+    var candidate = node;
+
+    // "While candidate is a modifiable element, and candidate has exactly one
+    // child, and that child is also a modifiable element, and candidate is not
+    // a simple modifiable element or candidate's specified command value for
+    // command is not equivalent to new value, set candidate to its child."
+    while (isModifiableElement(candidate)
+    && candidate.childNodes.length == 1
+    && isModifiableElement(candidate.firstChild)
+    && (!isSimpleModifiableElement(candidate)
+    || !areEquivalentValues(command, getSpecifiedCommandValue(candidate, command), newValue))) {
+        candidate = candidate.firstChild;
+    }
+
+    // "If candidate is node, or is not a simple modifiable element, or its
+    // specified command value is not equivalent to new value, or its effective
+    // command value is not loosely equivalent to new value, abort these
+    // steps."
+    if (candidate == node
+    || !isSimpleModifiableElement(candidate)
+    || !areEquivalentValues(command, getSpecifiedCommandValue(candidate, command), newValue)
+    || !areLooselyEquivalentValues(command, getEffectiveCommandValue(candidate, command), newValue)) {
+        return;
+    }
+
+    // "While candidate has children, insert the first child of candidate into
+    // candidate's parent immediately before candidate, preserving ranges."
+    while (candidate.hasChildNodes()) {
+        movePreservingRanges(candidate.firstChild, candidate.parentNode, getNodeIndex(candidate));
+    }
+
+    // "Insert candidate into node's parent immediately after node."
+    node.parentNode.insertBefore(candidate, node.nextSibling);
+
+    // "Append the node as the last child of candidate, preserving ranges."
+    movePreservingRanges(node, candidate, -1);
+}
+
+function recordValues(nodeList) {
+    // "Let values be a list of (node, command, specified command value)
+    // triples, initially empty."
+    var values = [];
+
+    // "For each node in node list, for each command in the list "subscript",
+    // "bold", "fontName", "fontSize", "foreColor", "hiliteColor", "italic",
+    // "strikethrough", and "underline" in that order:"
+    nodeList.forEach(function(node) {
+        ["subscript", "bold", "fontname", "fontsize", "forecolor",
+        "hilitecolor", "italic", "strikethrough", "underline"].forEach(function(command) {
+            // "Let ancestor equal node."
+            var ancestor = node;
+
+            // "If ancestor is not an Element, set it to its parent."
+            if (ancestor.nodeType != Node.ELEMENT_NODE) {
+                ancestor = ancestor.parentNode;
+            }
+
+            // "While ancestor is an Element and its specified command value
+            // for command is null, set it to its parent."
+            while (ancestor
+            && ancestor.nodeType == Node.ELEMENT_NODE
+            && getSpecifiedCommandValue(ancestor, command) === null) {
+                ancestor = ancestor.parentNode;
+            }
+
+            // "If ancestor is an Element, add (node, command, ancestor's
+            // specified command value for command) to values. Otherwise add
+            // (node, command, null) to values."
+            if (ancestor && ancestor.nodeType == Node.ELEMENT_NODE) {
+                values.push([node, command, getSpecifiedCommandValue(ancestor, command)]);
+            } else {
+                values.push([node, command, null]);
+            }
+        });
+    });
+
+    // "Return values."
+    return values;
+}
+
+function restoreValues(values) {
+    // "For each (node, command, value) triple in values:"
+    values.forEach(function(triple) {
+        var node = triple[0];
+        var command = triple[1];
+        var value = triple[2];
+
+        // "Let ancestor equal node."
+        var ancestor = node;
+
+        // "If ancestor is not an Element, set it to its parent."
+        if (!ancestor || ancestor.nodeType != Node.ELEMENT_NODE) {
+            ancestor = ancestor.parentNode;
+        }
+
+        // "While ancestor is an Element and its specified command value for
+        // command is null, set it to its parent."
+        while (ancestor
+        && ancestor.nodeType == Node.ELEMENT_NODE
+        && getSpecifiedCommandValue(ancestor, command) === null) {
+            ancestor = ancestor.parentNode;
+        }
+
+        // "If value is null and ancestor is an Element, push down values on
+        // node for command, with new value null."
+        if (value === null
+        && ancestor
+        && ancestor.nodeType == Node.ELEMENT_NODE) {
+            pushDownValues(node, command, null);
+
+        // "Otherwise, if ancestor is an Element and its specified command
+        // value for command is not equivalent to value, or if ancestor is not
+        // an Element and value is not null, force the value of command to
+        // value on node."
+        } else if ((ancestor
+        && ancestor.nodeType == Node.ELEMENT_NODE
+        && !areEquivalentValues(command, getSpecifiedCommandValue(ancestor, command), value))
+        || ((!ancestor || ancestor.nodeType != Node.ELEMENT_NODE)
+        && value !== null)) {
+            forceValue(node, command, value);
+        }
+    });
+}
+
+
+//@}
+///// Clearing an element's value /////
+//@{
+
+function clearValue(element, command) {
+    // "If element is not editable, return the empty list."
+    if (!isEditable(element)) {
+        return [];
+    }
+
+    // "If element's specified command value for command is null, return the
+    // empty list."
+    if (getSpecifiedCommandValue(element, command) === null) {
+        return [];
+    }
+
+    // "If element is a simple modifiable element:"
+    if (isSimpleModifiableElement(element)) {
+        // "Let children be the children of element."
+        var children = Array.prototype.slice.call(element.childNodes);
+
+        // "For each child in children, insert child into element's parent
+        // immediately before element, preserving ranges."
+        for (var i = 0; i < children.length; i++) {
+            movePreservingRanges(children[i], element.parentNode, getNodeIndex(element));
+        }
+
+        // "Remove element from its parent."
+        element.parentNode.removeChild(element);
+
+        // "Return children."
+        return children;
+    }
+
+    // "If command is "strikethrough", and element has a style attribute that
+    // sets "text-decoration" to some value containing "line-through", delete
+    // "line-through" from the value."
+    if (command == "strikethrough"
+    && element.style.textDecoration.indexOf("line-through") != -1) {
+        if (element.style.textDecoration == "line-through") {
+            element.style.textDecoration = "";
+        } else {
+            element.style.textDecoration = element.style.textDecoration.replace("line-through", "");
+        }
+        if (element.getAttribute("style") == "") {
+            element.removeAttribute("style");
+        }
+    }
+
+    // "If command is "underline", and element has a style attribute that sets
+    // "text-decoration" to some value containing "underline", delete
+    // "underline" from the value."
+    if (command == "underline"
+    && element.style.textDecoration.indexOf("underline") != -1) {
+        if (element.style.textDecoration == "underline") {
+            element.style.textDecoration = "";
+        } else {
+            element.style.textDecoration = element.style.textDecoration.replace("underline", "");
+        }
+        if (element.getAttribute("style") == "") {
+            element.removeAttribute("style");
+        }
+    }
+
+    // "If the relevant CSS property for command is not null, unset the CSS
+    // property property of element."
+    if (commands[command].relevantCssProperty !== null) {
+        element.style[commands[command].relevantCssProperty] = '';
+        if (element.getAttribute("style") == "") {
+            element.removeAttribute("style");
+        }
+    }
+
+    // "If element is a font element:"
+    if (isHtmlNamespace(element.namespaceURI) && element.tagName == "FONT") {
+        // "If command is "foreColor", unset element's color attribute, if set."
+        if (command == "forecolor") {
+            element.removeAttribute("color");
+        }
+
+        // "If command is "fontName", unset element's face attribute, if set."
+        if (command == "fontname") {
+            element.removeAttribute("face");
+        }
+
+        // "If command is "fontSize", unset element's size attribute, if set."
+        if (command == "fontsize") {
+            element.removeAttribute("size");
+        }
+    }
+
+    // "If element is an a element and command is "createLink" or "unlink",
+    // unset the href property of element."
+    if (isHtmlElement(element, "A")
+    && (command == "createlink" || command == "unlink")) {
+        element.removeAttribute("href");
+    }
+
+    // "If element's specified command value for command is null, return the
+    // empty list."
+    if (getSpecifiedCommandValue(element, command) === null) {
+        return [];
+    }
+
+    // "Set the tag name of element to "span", and return the one-node list
+    // consisting of the result."
+    return [setTagName(element, "span")];
+}
+
+
+//@}
+///// Pushing down values /////
+//@{
+
+function pushDownValues(node, command, newValue) {
+    // "If node's parent is not an Element, abort this algorithm."
+    if (!node.parentNode
+    || node.parentNode.nodeType != Node.ELEMENT_NODE) {
+        return;
+    }
+
+    // "If the effective command value of command is loosely equivalent to new
+    // value on node, abort this algorithm."
+    if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
+        return;
+    }
+
+    // "Let current ancestor be node's parent."
+    var currentAncestor = node.parentNode;
+
+    // "Let ancestor list be a list of Nodes, initially empty."
+    var ancestorList = [];
+
+    // "While current ancestor is an editable Element and the effective command
+    // value of command is not loosely equivalent to new value on it, append
+    // current ancestor to ancestor list, then set current ancestor to its
+    // parent."
+    while (isEditable(currentAncestor)
+    && currentAncestor.nodeType == Node.ELEMENT_NODE
+    && !areLooselyEquivalentValues(command, getEffectiveCommandValue(currentAncestor, command), newValue)) {
+        ancestorList.push(currentAncestor);
+        currentAncestor = currentAncestor.parentNode;
+    }
+
+    // "If ancestor list is empty, abort this algorithm."
+    if (!ancestorList.length) {
+        return;
+    }
+
+    // "Let propagated value be the specified command value of command on the
+    // last member of ancestor list."
+    var propagatedValue = getSpecifiedCommandValue(ancestorList[ancestorList.length - 1], command);
+
+    // "If propagated value is null and is not equal to new value, abort this
+    // algorithm."
+    if (propagatedValue === null && propagatedValue != newValue) {
+        return;
+    }
+
+    // "If the effective command value for the parent of the last member of
+    // ancestor list is not loosely equivalent to new value, and new value is
+    // not null, abort this algorithm."
+    if (newValue !== null
+    && !areLooselyEquivalentValues(command, getEffectiveCommandValue(ancestorList[ancestorList.length - 1].parentNode, command), newValue)) {
+        return;
+    }
+
+    // "While ancestor list is not empty:"
+    while (ancestorList.length) {
+        // "Let current ancestor be the last member of ancestor list."
+        // "Remove the last member from ancestor list."
+        var currentAncestor = ancestorList.pop();
+
+        // "If the specified command value of current ancestor for command is
+        // not null, set propagated value to that value."
+        if (getSpecifiedCommandValue(currentAncestor, command) !== null) {
+            propagatedValue = getSpecifiedCommandValue(currentAncestor, command);
+        }
+
+        // "Let children be the children of current ancestor."
+        var children = Array.prototype.slice.call(currentAncestor.childNodes);
+
+        // "If the specified command value of current ancestor for command is
+        // not null, clear the value of current ancestor."
+        if (getSpecifiedCommandValue(currentAncestor, command) !== null) {
+            clearValue(currentAncestor, command);
+        }
+
+        // "For every child in children:"
+        for (var i = 0; i < children.length; i++) {
+            var child = children[i];
+
+            // "If child is node, continue with the next child."
+            if (child == node) {
+                continue;
+            }
+
+            // "If child is an Element whose specified command value for
+            // command is neither null nor equivalent to propagated value,
+            // continue with the next child."
+            if (child.nodeType == Node.ELEMENT_NODE
+            && getSpecifiedCommandValue(child, command) !== null
+            && !areEquivalentValues(command, propagatedValue, getSpecifiedCommandValue(child, command))) {
+                continue;
+            }
+
+            // "If child is the last member of ancestor list, continue with the
+            // next child."
+            if (child == ancestorList[ancestorList.length - 1]) {
+                continue;
+            }
+
+            // "Force the value of child, with command as in this algorithm
+            // and new value equal to propagated value."
+            forceValue(child, command, propagatedValue);
+        }
+    }
+}
+
+
+//@}
+///// Forcing the value of a node /////
+//@{
+
+function forceValue(node, command, newValue) {
+    // "If node's parent is null, abort this algorithm."
+    if (!node.parentNode) {
+        return;
+    }
+
+    // "If new value is null, abort this algorithm."
+    if (newValue === null) {
+        return;
+    }
+
+    // "If node is an allowed child of "span":"
+    if (isAllowedChild(node, "span")) {
+        // "Reorder modifiable descendants of node's previousSibling."
+        reorderModifiableDescendants(node.previousSibling, command, newValue);
+
+        // "Reorder modifiable descendants of node's nextSibling."
+        reorderModifiableDescendants(node.nextSibling, command, newValue);
+
+        // "Wrap the one-node list consisting of node, with sibling criteria
+        // returning true for a simple modifiable element whose specified
+        // command value is equivalent to new value and whose effective command
+        // value is loosely equivalent to new value and false otherwise, and
+        // with new parent instructions returning null."
+        wrap([node],
+            function(node) {
+                return isSimpleModifiableElement(node)
+                    && areEquivalentValues(command, getSpecifiedCommandValue(node, command), newValue)
+                    && areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue);
+            },
+            function() { return null }
+        );
+    }
+
+    // "If node is invisible, abort this algorithm."
+    if (isInvisible(node)) {
+        return;
+    }
+
+    // "If the effective command value of command is loosely equivalent to new
+    // value on node, abort this algorithm."
+    if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
+        return;
+    }
+
+    // "If node is not an allowed child of "span":"
+    if (!isAllowedChild(node, "span")) {
+        // "Let children be all children of node, omitting any that are
+        // Elements whose specified command value for command is neither null
+        // nor equivalent to new value."
+        var children = [];
+        for (var i = 0; i < node.childNodes.length; i++) {
+            if (node.childNodes[i].nodeType == Node.ELEMENT_NODE) {
+                var specifiedValue = getSpecifiedCommandValue(node.childNodes[i], command);
+
+                if (specifiedValue !== null
+                && !areEquivalentValues(command, newValue, specifiedValue)) {
+                    continue;
+                }
+            }
+            children.push(node.childNodes[i]);
+        }
+
+        // "Force the value of each Node in children, with command and new
+        // value as in this invocation of the algorithm."
+        for (var i = 0; i < children.length; i++) {
+            forceValue(children[i], command, newValue);
+        }
+
+        // "Abort this algorithm."
+        return;
+    }
+
+    // "If the effective command value of command is loosely equivalent to new
+    // value on node, abort this algorithm."
+    if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
+        return;
+    }
+
+    // "Let new parent be null."
+    var newParent = null;
+
+    // "If the CSS styling flag is false:"
+    if (!cssStylingFlag) {
+        // "If command is "bold" and new value is "bold", let new parent be the
+        // result of calling createElement("b") on the ownerDocument of node."
+        if (command == "bold" && (newValue == "bold" || newValue == "700")) {
+            newParent = node.ownerDocument.createElement("b");
+        }
+
+        // "If command is "italic" and new value is "italic", let new parent be
+        // the result of calling createElement("i") on the ownerDocument of
+        // node."
+        if (command == "italic" && newValue == "italic") {
+            newParent = node.ownerDocument.createElement("i");
+        }
+
+        // "If command is "strikethrough" and new value is "line-through", let
+        // new parent be the result of calling createElement("s") on the
+        // ownerDocument of node."
+        if (command == "strikethrough" && newValue == "line-through") {
+            newParent = node.ownerDocument.createElement("s");
+        }
+
+        // "If command is "underline" and new value is "underline", let new
+        // parent be the result of calling createElement("u") on the
+        // ownerDocument of node."
+        if (command == "underline" && newValue == "underline") {
+            newParent = node.ownerDocument.createElement("u");
+        }
+
+        // "If command is "foreColor", and new value is fully opaque with red,
+        // green, and blue components in the range 0 to 255:"
+        if (command == "forecolor" && parseSimpleColor(newValue)) {
+            // "Let new parent be the result of calling createElement("font")
+            // on the ownerDocument of node."
+            newParent = node.ownerDocument.createElement("font");
+
+            // "Set the color attribute of new parent to the result of applying
+            // the rules for serializing simple color values to new value
+            // (interpreted as a simple color)."
+            newParent.setAttribute("color", parseSimpleColor(newValue));
+        }
+
+        // "If command is "fontName", let new parent be the result of calling
+        // createElement("font") on the ownerDocument of node, then set the
+        // face attribute of new parent to new value."
+        if (command == "fontname") {
+            newParent = node.ownerDocument.createElement("font");
+            newParent.face = newValue;
+        }
+    }
+
+    // "If command is "createLink" or "unlink":"
+    if (command == "createlink" || command == "unlink") {
+        // "Let new parent be the result of calling createElement("a") on the
+        // ownerDocument of node."
+        newParent = node.ownerDocument.createElement("a");
+
+        // "Set the href attribute of new parent to new value."
+        newParent.setAttribute("href", newValue);
+
+        // "Let ancestor be node's parent."
+        var ancestor = node.parentNode;
+
+        // "While ancestor is not null:"
+        while (ancestor) {
+            // "If ancestor is an a, set the tag name of ancestor to "span",
+            // and let ancestor be the result."
+            if (isHtmlElement(ancestor, "A")) {
+                ancestor = setTagName(ancestor, "span");
+            }
+
+            // "Set ancestor to its parent."
+            ancestor = ancestor.parentNode;
+        }
+    }
+
+    // "If command is "fontSize"; and new value is one of "x-small", "small",
+    // "medium", "large", "x-large", "xx-large", or "xxx-large"; and either the
+    // CSS styling flag is false, or new value is "xxx-large": let new parent
+    // be the result of calling createElement("font") on the ownerDocument of
+    // node, then set the size attribute of new parent to the number from the
+    // following table based on new value: [table omitted]"
+    if (command == "fontsize"
+    && ["x-small", "small", "medium", "large", "x-large", "xx-large", "xxx-large"].indexOf(newValue) != -1
+    && (!cssStylingFlag || newValue == "xxx-large")) {
+        newParent = node.ownerDocument.createElement("font");
+        newParent.size = cssSizeToLegacy(newValue);
+    }
+
+    // "If command is "subscript" or "superscript" and new value is
+    // "subscript", let new parent be the result of calling
+    // createElement("sub") on the ownerDocument of node."
+    if ((command == "subscript" || command == "superscript")
+    && newValue == "subscript") {
+        newParent = node.ownerDocument.createElement("sub");
+    }
+
+    // "If command is "subscript" or "superscript" and new value is
+    // "superscript", let new parent be the result of calling
+    // createElement("sup") on the ownerDocument of node."
+    if ((command == "subscript" || command == "superscript")
+    && newValue == "superscript") {
+        newParent = node.ownerDocument.createElement("sup");
+    }
+
+    // "If new parent is null, let new parent be the result of calling
+    // createElement("span") on the ownerDocument of node."
+    if (!newParent) {
+        newParent = node.ownerDocument.createElement("span");
+    }
+
+    // "Insert new parent in node's parent before node."
+    node.parentNode.insertBefore(newParent, node);
+
+    // "If the effective command value of command for new parent is not loosely
+    // equivalent to new value, and the relevant CSS property for command is
+    // not null, set that CSS property of new parent to new value (if the new
+    // value would be valid)."
+    var property = commands[command].relevantCssProperty;
+    if (property !== null
+    && !areLooselyEquivalentValues(command, getEffectiveCommandValue(newParent, command), newValue)) {
+        newParent.style[property] = newValue;
+    }
+
+    // "If command is "strikethrough", and new value is "line-through", and the
+    // effective command value of "strikethrough" for new parent is not
+    // "line-through", set the "text-decoration" property of new parent to
+    // "line-through"."
+    if (command == "strikethrough"
+    && newValue == "line-through"
+    && getEffectiveCommandValue(newParent, "strikethrough") != "line-through") {
+        newParent.style.textDecoration = "line-through";
+    }
+
+    // "If command is "underline", and new value is "underline", and the
+    // effective command value of "underline" for new parent is not
+    // "underline", set the "text-decoration" property of new parent to
+    // "underline"."
+    if (command == "underline"
+    && newValue == "underline"
+    && getEffectiveCommandValue(newParent, "underline") != "underline") {
+        newParent.style.textDecoration = "underline";
+    }
+
+    // "Append node to new parent as its last child, preserving ranges."
+    movePreservingRanges(node, newParent, newParent.childNodes.length);
+
+    // "If node is an Element and the effective command value of command for
+    // node is not loosely equivalent to new value:"
+    if (node.nodeType == Node.ELEMENT_NODE
+    && !areEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
+        // "Insert node into the parent of new parent before new parent,
+        // preserving ranges."
+        movePreservingRanges(node, newParent.parentNode, getNodeIndex(newParent));
+
+        // "Remove new parent from its parent."
+        newParent.parentNode.removeChild(newParent);
+
+        // "Let children be all children of node, omitting any that are
+        // Elements whose specified command value for command is neither null
+        // nor equivalent to new value."
+        var children = [];
+        for (var i = 0; i < node.childNodes.length; i++) {
+            if (node.childNodes[i].nodeType == Node.ELEMENT_NODE) {
+                var specifiedValue = getSpecifiedCommandValue(node.childNodes[i], command);
+
+                if (specifiedValue !== null
+                && !areEquivalentValues(command, newValue, specifiedValue)) {
+                    continue;
+                }
+            }
+            children.push(node.childNodes[i]);
+        }
+
+        // "Force the value of each Node in children, with command and new
+        // value as in this invocation of the algorithm."
+        for (var i = 0; i < children.length; i++) {
+            forceValue(children[i], command, newValue);
+        }
+    }
+}
+
+
+//@}
+///// Setting the selection's value /////
+//@{
+
+function setSelectionValue(command, newValue) {
+    // "If there is no formattable node effectively contained in the active
+    // range:"
+    if (!getAllEffectivelyContainedNodes(getActiveRange())
+    .some(isFormattableNode)) {
+        // "If command has inline command activated values, set the state
+        // override to true if new value is among them and false if it's not."
+        if ("inlineCommandActivatedValues" in commands[command]) {
+            setStateOverride(command, commands[command].inlineCommandActivatedValues
+                .indexOf(newValue) != -1);
+        }
+
+        // "If command is "subscript", unset the state override for
+        // "superscript"."
+        if (command == "subscript") {
+            unsetStateOverride("superscript");
+        }
+
+        // "If command is "superscript", unset the state override for
+        // "subscript"."
+        if (command == "superscript") {
+            unsetStateOverride("subscript");
+        }
+
+        // "If new value is null, unset the value override (if any)."
+        if (newValue === null) {
+            unsetValueOverride(command);
+
+        // "Otherwise, if command is "createLink" or it has a value specified,
+        // set the value override to new value."
+        } else if (command == "createlink" || "value" in commands[command]) {
+            setValueOverride(command, newValue);
+        }
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "If the active range's start node is an editable Text node, and its
+    // start offset is neither zero nor its start node's length, call
+    // splitText() on the active range's start node, with argument equal to the
+    // active range's start offset. Then set the active range's start node to
+    // the result, and its start offset to zero."
+    if (isEditable(getActiveRange().startContainer)
+    && getActiveRange().startContainer.nodeType == Node.TEXT_NODE
+    && getActiveRange().startOffset != 0
+    && getActiveRange().startOffset != getNodeLength(getActiveRange().startContainer)) {
+        // Account for browsers not following range mutation rules
+        var newActiveRange = document.createRange();
+        var newNode;
+        if (getActiveRange().startContainer == getActiveRange().endContainer) {
+            var newEndOffset = getActiveRange().endOffset - getActiveRange().startOffset;
+            newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
+            newActiveRange.setEnd(newNode, newEndOffset);
+            getActiveRange().setEnd(newNode, newEndOffset);
+        } else {
+            newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
+        }
+        newActiveRange.setStart(newNode, 0);
+        getSelection().removeAllRanges();
+        getSelection().addRange(newActiveRange);
+
+        getActiveRange().setStart(newNode, 0);
+    }
+
+    // "If the active range's end node is an editable Text node, and its end
+    // offset is neither zero nor its end node's length, call splitText() on
+    // the active range's end node, with argument equal to the active range's
+    // end offset."
+    if (isEditable(getActiveRange().endContainer)
+    && getActiveRange().endContainer.nodeType == Node.TEXT_NODE
+    && getActiveRange().endOffset != 0
+    && getActiveRange().endOffset != getNodeLength(getActiveRange().endContainer)) {
+        // IE seems to mutate the range incorrectly here, so we need correction
+        // here as well.  The active range will be temporarily in orphaned
+        // nodes, so calling getActiveRange() after splitText() but before
+        // fixing the range will throw an exception.
+        var activeRange = getActiveRange();
+        var newStart = [activeRange.startContainer, activeRange.startOffset];
+        var newEnd = [activeRange.endContainer, activeRange.endOffset];
+        activeRange.endContainer.splitText(activeRange.endOffset);
+        activeRange.setStart(newStart[0], newStart[1]);
+        activeRange.setEnd(newEnd[0], newEnd[1]);
+
+        getSelection().removeAllRanges();
+        getSelection().addRange(activeRange);
+    }
+
+    // "Let element list be all editable Elements effectively contained in the
+    // active range.
+    //
+    // "For each element in element list, clear the value of element."
+    getAllEffectivelyContainedNodes(getActiveRange(), function(node) {
+        return isEditable(node) && node.nodeType == Node.ELEMENT_NODE;
+    }).forEach(function(element) {
+        clearValue(element, command);
+    });
+
+    // "Let node list be all editable nodes effectively contained in the active
+    // range.
+    //
+    // "For each node in node list:"
+    getAllEffectivelyContainedNodes(getActiveRange(), isEditable).forEach(function(node) {
+        // "Push down values on node."
+        pushDownValues(node, command, newValue);
+
+        // "If node is an allowed child of span, force the value of node."
+        if (isAllowedChild(node, "span")) {
+            forceValue(node, command, newValue);
+        }
+    });
+}
+
+
+//@}
+///// The backColor command /////
+//@{
+commands.backcolor = {
+    // Copy-pasted, same as hiliteColor
+    action: function(value) {
+        // Action is further copy-pasted, same as foreColor
+
+        // "If value is not a valid CSS color, prepend "#" to it."
+        //
+        // "If value is still not a valid CSS color, or if it is currentColor,
+        // return false."
+        //
+        // Cheap hack for testing, no attempt to be comprehensive.
+        if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
+            value = "#" + value;
+        }
+        if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
+        && !parseSimpleColor(value)
+        && value.toLowerCase() != "transparent") {
+            return false;
+        }
+
+        // "Set the selection's value to value."
+        setSelectionValue("backcolor", value);
+
+        // "Return true."
+        return true;
+    }, standardInlineValueCommand: true, relevantCssProperty: "backgroundColor",
+    equivalentValues: function(val1, val2) {
+        // "Either both strings are valid CSS colors and have the same red,
+        // green, blue, and alpha components, or neither string is a valid CSS
+        // color."
+        return normalizeColor(val1) === normalizeColor(val2);
+    },
+};
+
+//@}
+///// The bold command /////
+//@{
+commands.bold = {
+    action: function() {
+        // "If queryCommandState("bold") returns true, set the selection's
+        // value to "normal". Otherwise set the selection's value to "bold".
+        // Either way, return true."
+        if (myQueryCommandState("bold")) {
+            setSelectionValue("bold", "normal");
+        } else {
+            setSelectionValue("bold", "bold");
+        }
+        return true;
+    }, inlineCommandActivatedValues: ["bold", "600", "700", "800", "900"],
+    relevantCssProperty: "fontWeight",
+    equivalentValues: function(val1, val2) {
+        // "Either the two strings are equal, or one is "bold" and the other is
+        // "700", or one is "normal" and the other is "400"."
+        return val1 == val2
+            || (val1 == "bold" && val2 == "700")
+            || (val1 == "700" && val2 == "bold")
+            || (val1 == "normal" && val2 == "400")
+            || (val1 == "400" && val2 == "normal");
+    },
+};
+
+//@}
+///// The createLink command /////
+//@{
+commands.createlink = {
+    action: function(value) {
+        // "If value is the empty string, return false."
+        if (value === "") {
+            return false;
+        }
+
+        // "For each editable a element that has an href attribute and is an
+        // ancestor of some node effectively contained in the active range, set
+        // that a element's href attribute to value."
+        //
+        // TODO: We don't actually do this in tree order, not that it matters
+        // unless you're spying with mutation events.
+        getAllEffectivelyContainedNodes(getActiveRange()).forEach(function(node) {
+            getAncestors(node).forEach(function(ancestor) {
+                if (isEditable(ancestor)
+                && isHtmlElement(ancestor, "a")
+                && ancestor.hasAttribute("href")) {
+                    ancestor.setAttribute("href", value);
+                }
+            });
+        });
+
+        // "Set the selection's value to value."
+        setSelectionValue("createlink", value);
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The fontName command /////
+//@{
+commands.fontname = {
+    action: function(value) {
+        // "Set the selection's value to value, then return true."
+        setSelectionValue("fontname", value);
+        return true;
+    }, standardInlineValueCommand: true, relevantCssProperty: "fontFamily"
+};
+
+//@}
+///// The fontSize command /////
+//@{
+
+// Helper function for fontSize's action plus queryOutputHelper.  It's just the
+// middle of fontSize's action, ripped out into its own function.  Returns null
+// if the size is invalid.
+function normalizeFontSize(value) {
+    // "Strip leading and trailing whitespace from value."
+    //
+    // Cheap hack, not following the actual algorithm.
+    value = value.trim();
+
+    // "If value is not a valid floating point number, and would not be a valid
+    // floating point number if a single leading "+" character were stripped,
+    // return false."
+    if (!/^[-+]?[0-9]+(\.[0-9]+)?([eE][-+]?[0-9]+)?$/.test(value)) {
+        return null;
+    }
+
+    var mode;
+
+    // "If the first character of value is "+", delete the character and let
+    // mode be "relative-plus"."
+    if (value[0] == "+") {
+        value = value.slice(1);
+        mode = "relative-plus";
+    // "Otherwise, if the first character of value is "-", delete the character
+    // and let mode be "relative-minus"."
+    } else if (value[0] == "-") {
+        value = value.slice(1);
+        mode = "relative-minus";
+    // "Otherwise, let mode be "absolute"."
+    } else {
+        mode = "absolute";
+    }
+
+    // "Apply the rules for parsing non-negative integers to value, and let
+    // number be the result."
+    //
+    // Another cheap hack.
+    var num = parseInt(value);
+
+    // "If mode is "relative-plus", add three to number."
+    if (mode == "relative-plus") {
+        num += 3;
+    }
+
+    // "If mode is "relative-minus", negate number, then add three to it."
+    if (mode == "relative-minus") {
+        num = 3 - num;
+    }
+
+    // "If number is less than one, let number equal 1."
+    if (num < 1) {
+        num = 1;
+    }
+
+    // "If number is greater than seven, let number equal 7."
+    if (num > 7) {
+        num = 7;
+    }
+
+    // "Set value to the string here corresponding to number:" [table omitted]
+    value = {
+        1: "x-small",
+        2: "small",
+        3: "medium",
+        4: "large",
+        5: "x-large",
+        6: "xx-large",
+        7: "xxx-large"
+    }[num];
+
+    return value;
+}
+
+commands.fontsize = {
+    action: function(value) {
+        value = normalizeFontSize(value);
+        if (value === null) {
+            return false;
+        }
+
+        // "Set the selection's value to value."
+        setSelectionValue("fontsize", value);
+
+        // "Return true."
+        return true;
+    }, indeterm: function() {
+        // "True if among formattable nodes that are effectively contained in
+        // the active range, there are two that have distinct effective command
+        // values.  Otherwise false."
+        return getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)
+        .map(function(node) {
+            return getEffectiveCommandValue(node, "fontsize");
+        }).filter(function(value, i, arr) {
+            return arr.slice(0, i).indexOf(value) == -1;
+        }).length >= 2;
+    }, value: function() {
+        // "If the active range is null, return the empty string."
+        if (!getActiveRange()) {
+            return "";
+        }
+
+        // "Let pixel size be the effective command value of the first
+        // formattable node that is effectively contained in the active range,
+        // or if there is no such node, the effective command value of the
+        // active range's start node, in either case interpreted as a number of
+        // pixels."
+        var node = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)[0];
+        if (node === undefined) {
+            node = getActiveRange().startContainer;
+        }
+        var pixelSize = getEffectiveCommandValue(node, "fontsize");
+
+        // "Return the legacy font size for pixel size."
+        return getLegacyFontSize(pixelSize);
+    }, relevantCssProperty: "fontSize"
+};
+
+function getLegacyFontSize(size) {
+    if (getLegacyFontSize.resultCache === undefined) {
+        getLegacyFontSize.resultCache = {};
+    }
+
+    if (getLegacyFontSize.resultCache[size] !== undefined) {
+        return getLegacyFontSize.resultCache[size];
+    }
+
+    // For convenience in other places in my code, I handle all sizes, not just
+    // pixel sizes as the spec says.  This means pixel sizes have to be passed
+    // in suffixed with "px", not as plain numbers.
+    if (normalizeFontSize(size) !== null) {
+        return getLegacyFontSize.resultCache[size] = cssSizeToLegacy(normalizeFontSize(size));
+    }
+
+    if (["x-small", "x-small", "small", "medium", "large", "x-large", "xx-large", "xxx-large"].indexOf(size) == -1
+    && !/^[0-9]+(\.[0-9]+)?(cm|mm|in|pt|pc|px)$/.test(size)) {
+        // There is no sensible legacy size for things like "2em".
+        return getLegacyFontSize.resultCache[size] = null;
+    }
+
+    var font = document.createElement("font");
+    document.body.appendChild(font);
+    if (size == "xxx-large") {
+        font.size = 7;
+    } else {
+        font.style.fontSize = size;
+    }
+    var pixelSize = parseInt(getComputedStyle(font).fontSize);
+    document.body.removeChild(font);
+
+    // "Let returned size be 1."
+    var returnedSize = 1;
+
+    // "While returned size is less than 7:"
+    while (returnedSize < 7) {
+        // "Let lower bound be the resolved value of "font-size" in pixels
+        // of a font element whose size attribute is set to returned size."
+        var font = document.createElement("font");
+        font.size = returnedSize;
+        document.body.appendChild(font);
+        var lowerBound = parseInt(getComputedStyle(font).fontSize);
+
+        // "Let upper bound be the resolved value of "font-size" in pixels
+        // of a font element whose size attribute is set to one plus
+        // returned size."
+        font.size = 1 + returnedSize;
+        var upperBound = parseInt(getComputedStyle(font).fontSize);
+        document.body.removeChild(font);
+
+        // "Let average be the average of upper bound and lower bound."
+        var average = (upperBound + lowerBound)/2;
+
+        // "If pixel size is less than average, return the one-element
+        // string consisting of the digit returned size."
+        if (pixelSize < average) {
+            return getLegacyFontSize.resultCache[size] = String(returnedSize);
+        }
+
+        // "Add one to returned size."
+        returnedSize++;
+    }
+
+    // "Return "7"."
+    return getLegacyFontSize.resultCache[size] = "7";
+}
+
+//@}
+///// The foreColor command /////
+//@{
+commands.forecolor = {
+    action: function(value) {
+        // Copy-pasted, same as backColor and hiliteColor
+
+        // "If value is not a valid CSS color, prepend "#" to it."
+        //
+        // "If value is still not a valid CSS color, or if it is currentColor,
+        // return false."
+        //
+        // Cheap hack for testing, no attempt to be comprehensive.
+        if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
+            value = "#" + value;
+        }
+        if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
+        && !parseSimpleColor(value)
+        && value.toLowerCase() != "transparent") {
+            return false;
+        }
+
+        // "Set the selection's value to value."
+        setSelectionValue("forecolor", value);
+
+        // "Return true."
+        return true;
+    }, standardInlineValueCommand: true, relevantCssProperty: "color",
+    equivalentValues: function(val1, val2) {
+        // "Either both strings are valid CSS colors and have the same red,
+        // green, blue, and alpha components, or neither string is a valid CSS
+        // color."
+        return normalizeColor(val1) === normalizeColor(val2);
+    },
+};
+
+//@}
+///// The hiliteColor command /////
+//@{
+commands.hilitecolor = {
+    // Copy-pasted, same as backColor
+    action: function(value) {
+        // Action is further copy-pasted, same as foreColor
+
+        // "If value is not a valid CSS color, prepend "#" to it."
+        //
+        // "If value is still not a valid CSS color, or if it is currentColor,
+        // return false."
+        //
+        // Cheap hack for testing, no attempt to be comprehensive.
+        if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
+            value = "#" + value;
+        }
+        if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
+        && !parseSimpleColor(value)
+        && value.toLowerCase() != "transparent") {
+            return false;
+        }
+
+        // "Set the selection's value to value."
+        setSelectionValue("hilitecolor", value);
+
+        // "Return true."
+        return true;
+    }, indeterm: function() {
+        // "True if among editable Text nodes that are effectively contained in
+        // the active range, there are two that have distinct effective command
+        // values.  Otherwise false."
+        return getAllEffectivelyContainedNodes(getActiveRange(), function(node) {
+            return isEditable(node) && node.nodeType == Node.TEXT_NODE;
+        }).map(function(node) {
+            return getEffectiveCommandValue(node, "hilitecolor");
+        }).filter(function(value, i, arr) {
+            return arr.slice(0, i).indexOf(value) == -1;
+        }).length >= 2;
+    }, standardInlineValueCommand: true, relevantCssProperty: "backgroundColor",
+    equivalentValues: function(val1, val2) {
+        // "Either both strings are valid CSS colors and have the same red,
+        // green, blue, and alpha components, or neither string is a valid CSS
+        // color."
+        return normalizeColor(val1) === normalizeColor(val2);
+    },
+};
+
+//@}
+///// The italic command /////
+//@{
+commands.italic = {
+    action: function() {
+        // "If queryCommandState("italic") returns true, set the selection's
+        // value to "normal". Otherwise set the selection's value to "italic".
+        // Either way, return true."
+        if (myQueryCommandState("italic")) {
+            setSelectionValue("italic", "normal");
+        } else {
+            setSelectionValue("italic", "italic");
+        }
+        return true;
+    }, inlineCommandActivatedValues: ["italic", "oblique"],
+    relevantCssProperty: "fontStyle"
+};
+
+//@}
+///// The removeFormat command /////
+//@{
+commands.removeformat = {
+    action: function() {
+        // "A removeFormat candidate is an editable HTML element with local
+        // name "abbr", "acronym", "b", "bdi", "bdo", "big", "blink", "cite",
+        // "code", "dfn", "em", "font", "i", "ins", "kbd", "mark", "nobr", "q",
+        // "s", "samp", "small", "span", "strike", "strong", "sub", "sup",
+        // "tt", "u", or "var"."
+        function isRemoveFormatCandidate(node) {
+            return isEditable(node)
+                && isHtmlElement(node, ["abbr", "acronym", "b", "bdi", "bdo",
+                "big", "blink", "cite", "code", "dfn", "em", "font", "i",
+                "ins", "kbd", "mark", "nobr", "q", "s", "samp", "small",
+                "span", "strike", "strong", "sub", "sup", "tt", "u", "var"]);
+        }
+
+        // "Let elements to remove be a list of every removeFormat candidate
+        // effectively contained in the active range."
+        var elementsToRemove = getAllEffectivelyContainedNodes(getActiveRange(), isRemoveFormatCandidate);
+
+        // "For each element in elements to remove:"
+        elementsToRemove.forEach(function(element) {
+            // "While element has children, insert the first child of element
+            // into the parent of element immediately before element,
+            // preserving ranges."
+            while (element.hasChildNodes()) {
+                movePreservingRanges(element.firstChild, element.parentNode, getNodeIndex(element));
+            }
+
+            // "Remove element from its parent."
+            element.parentNode.removeChild(element);
+        });
+
+        // "If the active range's start node is an editable Text node, and its
+        // start offset is neither zero nor its start node's length, call
+        // splitText() on the active range's start node, with argument equal to
+        // the active range's start offset. Then set the active range's start
+        // node to the result, and its start offset to zero."
+        if (isEditable(getActiveRange().startContainer)
+        && getActiveRange().startContainer.nodeType == Node.TEXT_NODE
+        && getActiveRange().startOffset != 0
+        && getActiveRange().startOffset != getNodeLength(getActiveRange().startContainer)) {
+            // Account for browsers not following range mutation rules
+            if (getActiveRange().startContainer == getActiveRange().endContainer) {
+                var newEnd = getActiveRange().endOffset - getActiveRange().startOffset;
+                var newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
+                getActiveRange().setStart(newNode, 0);
+                getActiveRange().setEnd(newNode, newEnd);
+            } else {
+                getActiveRange().setStart(getActiveRange().startContainer.splitText(getActiveRange().startOffset), 0);
+            }
+        }
+
+        // "If the active range's end node is an editable Text node, and its
+        // end offset is neither zero nor its end node's length, call
+        // splitText() on the active range's end node, with argument equal to
+        // the active range's end offset."
+        if (isEditable(getActiveRange().endContainer)
+        && getActiveRange().endContainer.nodeType == Node.TEXT_NODE
+        && getActiveRange().endOffset != 0
+        && getActiveRange().endOffset != getNodeLength(getActiveRange().endContainer)) {
+            // IE seems to mutate the range incorrectly here, so we need
+            // correction here as well.  Have to be careful to set the range to
+            // something not including the text node so that getActiveRange()
+            // doesn't throw an exception due to a temporarily detached
+            // endpoint.
+            var newStart = [getActiveRange().startContainer, getActiveRange().startOffset];
+            var newEnd = [getActiveRange().endContainer, getActiveRange().endOffset];
+            getActiveRange().setEnd(document.documentElement, 0);
+            newEnd[0].splitText(newEnd[1]);
+            getActiveRange().setStart(newStart[0], newStart[1]);
+            getActiveRange().setEnd(newEnd[0], newEnd[1]);
+        }
+
+        // "Let node list consist of all editable nodes effectively contained
+        // in the active range."
+        //
+        // "For each node in node list, while node's parent is a removeFormat
+        // candidate in the same editing host as node, split the parent of the
+        // one-node list consisting of node."
+        getAllEffectivelyContainedNodes(getActiveRange(), isEditable).forEach(function(node) {
+            while (isRemoveFormatCandidate(node.parentNode)
+            && inSameEditingHost(node.parentNode, node)) {
+                splitParent([node]);
+            }
+        });
+
+        // "For each of the entries in the following list, in the given order,
+        // set the selection's value to null, with command as given."
+        [
+            "subscript",
+            "bold",
+            "fontname",
+            "fontsize",
+            "forecolor",
+            "hilitecolor",
+            "italic",
+            "strikethrough",
+            "underline",
+        ].forEach(function(command) {
+            setSelectionValue(command, null);
+        });
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The strikethrough command /////
+//@{
+commands.strikethrough = {
+    action: function() {
+        // "If queryCommandState("strikethrough") returns true, set the
+        // selection's value to null. Otherwise set the selection's value to
+        // "line-through".  Either way, return true."
+        if (myQueryCommandState("strikethrough")) {
+            setSelectionValue("strikethrough", null);
+        } else {
+            setSelectionValue("strikethrough", "line-through");
+        }
+        return true;
+    }, inlineCommandActivatedValues: ["line-through"]
+};
+
+//@}
+///// The subscript command /////
+//@{
+commands.subscript = {
+    action: function() {
+        // "Call queryCommandState("subscript"), and let state be the result."
+        var state = myQueryCommandState("subscript");
+
+        // "Set the selection's value to null."
+        setSelectionValue("subscript", null);
+
+        // "If state is false, set the selection's value to "subscript"."
+        if (!state) {
+            setSelectionValue("subscript", "subscript");
+        }
+
+        // "Return true."
+        return true;
+    }, indeterm: function() {
+        // "True if either among formattable nodes that are effectively
+        // contained in the active range, there is at least one with effective
+        // command value "subscript" and at least one with some other effective
+        // command value; or if there is some formattable node effectively
+        // contained in the active range with effective command value "mixed".
+        // Otherwise false."
+        var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
+        return (nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") == "subscript" })
+            && nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") != "subscript" }))
+            || nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") == "mixed" });
+    }, inlineCommandActivatedValues: ["subscript"],
+};
+
+//@}
+///// The superscript command /////
+//@{
+commands.superscript = {
+    action: function() {
+        // "Call queryCommandState("superscript"), and let state be the
+        // result."
+        var state = myQueryCommandState("superscript");
+
+        // "Set the selection's value to null."
+        setSelectionValue("superscript", null);
+
+        // "If state is false, set the selection's value to "superscript"."
+        if (!state) {
+            setSelectionValue("superscript", "superscript");
+        }
+
+        // "Return true."
+        return true;
+    }, indeterm: function() {
+        // "True if either among formattable nodes that are effectively
+        // contained in the active range, there is at least one with effective
+        // command value "superscript" and at least one with some other
+        // effective command value; or if there is some formattable node
+        // effectively contained in the active range with effective command
+        // value "mixed".  Otherwise false."
+        var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
+        return (nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") == "superscript" })
+            && nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") != "superscript" }))
+            || nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") == "mixed" });
+    }, inlineCommandActivatedValues: ["superscript"],
+};
+
+//@}
+///// The underline command /////
+//@{
+commands.underline = {
+    action: function() {
+        // "If queryCommandState("underline") returns true, set the selection's
+        // value to null. Otherwise set the selection's value to "underline".
+        // Either way, return true."
+        if (myQueryCommandState("underline")) {
+            setSelectionValue("underline", null);
+        } else {
+            setSelectionValue("underline", "underline");
+        }
+        return true;
+    }, inlineCommandActivatedValues: ["underline"]
+};
+
+//@}
+///// The unlink command /////
+//@{
+commands.unlink = {
+    action: function() {
+        // "Let hyperlinks be a list of every a element that has an href
+        // attribute and is contained in the active range or is an ancestor of
+        // one of its boundary points."
+        //
+        // As usual, take care to ensure it's tree order.  The correctness of
+        // the following is left as an exercise for the reader.
+        var range = getActiveRange();
+        var hyperlinks = [];
+        for (
+            var node = range.startContainer;
+            node;
+            node = node.parentNode
+        ) {
+            if (isHtmlElement(node, "A")
+            && node.hasAttribute("href")) {
+                hyperlinks.unshift(node);
+            }
+        }
+        for (
+            var node = range.startContainer;
+            node != nextNodeDescendants(range.endContainer);
+            node = nextNode(node)
+        ) {
+            if (isHtmlElement(node, "A")
+            && node.hasAttribute("href")
+            && (isContained(node, range)
+            || isAncestor(node, range.endContainer)
+            || node == range.endContainer)) {
+                hyperlinks.push(node);
+            }
+        }
+
+        // "Clear the value of each member of hyperlinks."
+        for (var i = 0; i < hyperlinks.length; i++) {
+            clearValue(hyperlinks[i], "unlink");
+        }
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+
+/////////////////////////////////////
+///// Block formatting commands /////
+/////////////////////////////////////
+
+///// Block formatting command definitions /////
+//@{
+
+// "An indentation element is either a blockquote, or a div that has a style
+// attribute that sets "margin" or some subproperty of it."
+function isIndentationElement(node) {
+    if (!isHtmlElement(node)) {
+        return false;
+    }
+
+    if (node.tagName == "BLOCKQUOTE") {
+        return true;
+    }
+
+    if (node.tagName != "DIV") {
+        return false;
+    }
+
+    for (var i = 0; i < node.style.length; i++) {
+        // Approximate check
+        if (/^(-[a-z]+-)?margin/.test(node.style[i])) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+// "A simple indentation element is an indentation element that has no
+// attributes except possibly
+//
+//   * "a style attribute that sets no properties other than "margin",
+//     "border", "padding", or subproperties of those; and/or
+//   * "a dir attribute."
+function isSimpleIndentationElement(node) {
+    if (!isIndentationElement(node)) {
+        return false;
+    }
+
+    for (var i = 0; i < node.attributes.length; i++) {
+        if (!isHtmlNamespace(node.attributes[i].namespaceURI)
+        || ["style", "dir"].indexOf(node.attributes[i].name) == -1) {
+            return false;
+        }
+    }
+
+    for (var i = 0; i < node.style.length; i++) {
+        // This is approximate, but it works well enough for my purposes.
+        if (!/^(-[a-z]+-)?(margin|border|padding)/.test(node.style[i])) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+// "A non-list single-line container is an HTML element with local name
+// "address", "div", "h1", "h2", "h3", "h4", "h5", "h6", "listing", "p", "pre",
+// or "xmp"."
+function isNonListSingleLineContainer(node) {
+    return isHtmlElement(node, ["address", "div", "h1", "h2", "h3", "h4", "h5",
+        "h6", "listing", "p", "pre", "xmp"]);
+}
+
+// "A single-line container is either a non-list single-line container, or an
+// HTML element with local name "li", "dt", or "dd"."
+function isSingleLineContainer(node) {
+    return isNonListSingleLineContainer(node)
+        || isHtmlElement(node, ["li", "dt", "dd"]);
+}
+
+function getBlockNodeOf(node) {
+    // "While node is an inline node, set node to its parent."
+    while (isInlineNode(node)) {
+        node = node.parentNode;
+    }
+
+    // "Return node."
+    return node;
+}
+
+//@}
+///// Assorted block formatting command algorithms /////
+//@{
+
+function fixDisallowedAncestors(node) {
+    // "If node is not editable, abort these steps."
+    if (!isEditable(node)) {
+        return;
+    }
+
+    // "If node is not an allowed child of any of its ancestors in the same
+    // editing host:"
+    if (getAncestors(node).every(function(ancestor) {
+        return !inSameEditingHost(node, ancestor)
+            || !isAllowedChild(node, ancestor)
+    })) {
+        // "If node is a dd or dt, wrap the one-node list consisting of node,
+        // with sibling criteria returning true for any dl with no attributes
+        // and false otherwise, and new parent instructions returning the
+        // result of calling createElement("dl") on the context object. Then
+        // abort these steps."
+        if (isHtmlElement(node, ["dd", "dt"])) {
+            wrap([node],
+                function(sibling) { return isHtmlElement(sibling, "dl") && !sibling.attributes.length },
+                function() { return document.createElement("dl") });
+            return;
+        }
+
+        // "If "p" is not an allowed child of the editing host of node, abort
+        // these steps."
+        if (!isAllowedChild("p", getEditingHostOf(node))) {
+            return;
+        }
+
+        // "If node is not a prohibited paragraph child, abort these steps."
+        if (!isProhibitedParagraphChild(node)) {
+            return;
+        }
+
+        // "Set the tag name of node to the default single-line container name,
+        // and let node be the result."
+        node = setTagName(node, defaultSingleLineContainerName);
+
+        // "Fix disallowed ancestors of node."
+        fixDisallowedAncestors(node);
+
+        // "Let children be node's children."
+        var children = [].slice.call(node.childNodes);
+
+        // "For each child in children, if child is a prohibited paragraph
+        // child:"
+        children.filter(isProhibitedParagraphChild)
+        .forEach(function(child) {
+            // "Record the values of the one-node list consisting of child, and
+            // let values be the result."
+            var values = recordValues([child]);
+
+            // "Split the parent of the one-node list consisting of child."
+            splitParent([child]);
+
+            // "Restore the values from values."
+            restoreValues(values);
+        });
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "Record the values of the one-node list consisting of node, and let
+    // values be the result."
+    var values = recordValues([node]);
+
+    // "While node is not an allowed child of its parent, split the parent of
+    // the one-node list consisting of node."
+    while (!isAllowedChild(node, node.parentNode)) {
+        splitParent([node]);
+    }
+
+    // "Restore the values from values."
+    restoreValues(values);
+}
+
+function normalizeSublists(item) {
+    // "If item is not an li or it is not editable or its parent is not
+    // editable, abort these steps."
+    if (!isHtmlElement(item, "LI")
+    || !isEditable(item)
+    || !isEditable(item.parentNode)) {
+        return;
+    }
+
+    // "Let new item be null."
+    var newItem = null;
+
+    // "While item has an ol or ul child:"
+    while ([].some.call(item.childNodes, function (node) { return isHtmlElement(node, ["OL", "UL"]) })) {
+        // "Let child be the last child of item."
+        var child = item.lastChild;
+
+        // "If child is an ol or ul, or new item is null and child is a Text
+        // node whose data consists of zero of more space characters:"
+        if (isHtmlElement(child, ["OL", "UL"])
+        || (!newItem && child.nodeType == Node.TEXT_NODE && /^[ \t\n\f\r]*$/.test(child.data))) {
+            // "Set new item to null."
+            newItem = null;
+
+            // "Insert child into the parent of item immediately following
+            // item, preserving ranges."
+            movePreservingRanges(child, item.parentNode, 1 + getNodeIndex(item));
+
+        // "Otherwise:"
+        } else {
+            // "If new item is null, let new item be the result of calling
+            // createElement("li") on the ownerDocument of item, then insert
+            // new item into the parent of item immediately after item."
+            if (!newItem) {
+                newItem = item.ownerDocument.createElement("li");
+                item.parentNode.insertBefore(newItem, item.nextSibling);
+            }
+
+            // "Insert child into new item as its first child, preserving
+            // ranges."
+            movePreservingRanges(child, newItem, 0);
+        }
+    }
+}
+
+function getSelectionListState() {
+    // "If the active range is null, return "none"."
+    if (!getActiveRange()) {
+        return "none";
+    }
+
+    // "Block-extend the active range, and let new range be the result."
+    var newRange = blockExtend(getActiveRange());
+
+    // "Let node list be a list of nodes, initially empty."
+    //
+    // "For each node contained in new range, append node to node list if the
+    // last member of node list (if any) is not an ancestor of node; node is
+    // editable; node is not an indentation element; and node is either an ol
+    // or ul, or the child of an ol or ul, or an allowed child of "li"."
+    var nodeList = getContainedNodes(newRange, function(node) {
+        return isEditable(node)
+            && !isIndentationElement(node)
+            && (isHtmlElement(node, ["ol", "ul"])
+            || isHtmlElement(node.parentNode, ["ol", "ul"])
+            || isAllowedChild(node, "li"));
+    });
+
+    // "If node list is empty, return "none"."
+    if (!nodeList.length) {
+        return "none";
+    }
+
+    // "If every member of node list is either an ol or the child of an ol or
+    // the child of an li child of an ol, and none is a ul or an ancestor of a
+    // ul, return "ol"."
+    if (nodeList.every(function(node) {
+        return isHtmlElement(node, "ol")
+            || isHtmlElement(node.parentNode, "ol")
+            || (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ol"));
+    })
+    && !nodeList.some(function(node) { return isHtmlElement(node, "ul") || ("querySelector" in node && node.querySelector("ul")) })) {
+        return "ol";
+    }
+
+    // "If every member of node list is either a ul or the child of a ul or the
+    // child of an li child of a ul, and none is an ol or an ancestor of an ol,
+    // return "ul"."
+    if (nodeList.every(function(node) {
+        return isHtmlElement(node, "ul")
+            || isHtmlElement(node.parentNode, "ul")
+            || (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ul"));
+    })
+    && !nodeList.some(function(node) { return isHtmlElement(node, "ol") || ("querySelector" in node && node.querySelector("ol")) })) {
+        return "ul";
+    }
+
+    var hasOl = nodeList.some(function(node) {
+        return isHtmlElement(node, "ol")
+            || isHtmlElement(node.parentNode, "ol")
+            || ("querySelector" in node && node.querySelector("ol"))
+            || (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ol"));
+    });
+    var hasUl = nodeList.some(function(node) {
+        return isHtmlElement(node, "ul")
+            || isHtmlElement(node.parentNode, "ul")
+            || ("querySelector" in node && node.querySelector("ul"))
+            || (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ul"));
+    });
+    // "If some member of node list is either an ol or the child or ancestor of
+    // an ol or the child of an li child of an ol, and some member of node list
+    // is either a ul or the child or ancestor of a ul or the child of an li
+    // child of a ul, return "mixed"."
+    if (hasOl && hasUl) {
+        return "mixed";
+    }
+
+    // "If some member of node list is either an ol or the child or ancestor of
+    // an ol or the child of an li child of an ol, return "mixed ol"."
+    if (hasOl) {
+        return "mixed ol";
+    }
+
+    // "If some member of node list is either a ul or the child or ancestor of
+    // a ul or the child of an li child of a ul, return "mixed ul"."
+    if (hasUl) {
+        return "mixed ul";
+    }
+
+    // "Return "none"."
+    return "none";
+}
+
+function getAlignmentValue(node) {
+    // "While node is neither null nor an Element, or it is an Element but its
+    // "display" property has resolved value "inline" or "none", set node to
+    // its parent."
+    while ((node && node.nodeType != Node.ELEMENT_NODE)
+    || (node.nodeType == Node.ELEMENT_NODE
+    && ["inline", "none"].indexOf(getComputedStyle(node).display) != -1)) {
+        node = node.parentNode;
+    }
+
+    // "If node is not an Element, return "left"."
+    if (!node || node.nodeType != Node.ELEMENT_NODE) {
+        return "left";
+    }
+
+    var resolvedValue = getComputedStyle(node).textAlign
+        // Hack around browser non-standardness
+        .replace(/^-(moz|webkit)-/, "")
+        .replace(/^auto$/, "start");
+
+    // "If node's "text-align" property has resolved value "start", return
+    // "left" if the directionality of node is "ltr", "right" if it is "rtl"."
+    if (resolvedValue == "start") {
+        return getDirectionality(node) == "ltr" ? "left" : "right";
+    }
+
+    // "If node's "text-align" property has resolved value "end", return
+    // "right" if the directionality of node is "ltr", "left" if it is "rtl"."
+    if (resolvedValue == "end") {
+        return getDirectionality(node) == "ltr" ? "right" : "left";
+    }
+
+    // "If node's "text-align" property has resolved value "center", "justify",
+    // "left", or "right", return that value."
+    if (["center", "justify", "left", "right"].indexOf(resolvedValue) != -1) {
+        return resolvedValue;
+    }
+
+    // "Return "left"."
+    return "left";
+}
+
+function getNextEquivalentPoint(node, offset) {
+    // "If node's length is zero, return null."
+    if (getNodeLength(node) == 0) {
+        return null;
+    }
+
+    // "If offset is node's length, and node's parent is not null, and node is
+    // an inline node, return (node's parent, 1 + node's index)."
+    if (offset == getNodeLength(node)
+    && node.parentNode
+    && isInlineNode(node)) {
+        return [node.parentNode, 1 + getNodeIndex(node)];
+    }
+
+    // "If node has a child with index offset, and that child's length is not
+    // zero, and that child is an inline node, return (that child, 0)."
+    if (0 <= offset
+    && offset < node.childNodes.length
+    && getNodeLength(node.childNodes[offset]) != 0
+    && isInlineNode(node.childNodes[offset])) {
+        return [node.childNodes[offset], 0];
+    }
+
+    // "Return null."
+    return null;
+}
+
+function getPreviousEquivalentPoint(node, offset) {
+    // "If node's length is zero, return null."
+    if (getNodeLength(node) == 0) {
+        return null;
+    }
+
+    // "If offset is 0, and node's parent is not null, and node is an inline
+    // node, return (node's parent, node's index)."
+    if (offset == 0
+    && node.parentNode
+    && isInlineNode(node)) {
+        return [node.parentNode, getNodeIndex(node)];
+    }
+
+    // "If node has a child with index offset − 1, and that child's length is
+    // not zero, and that child is an inline node, return (that child, that
+    // child's length)."
+    if (0 <= offset - 1
+    && offset - 1 < node.childNodes.length
+    && getNodeLength(node.childNodes[offset - 1]) != 0
+    && isInlineNode(node.childNodes[offset - 1])) {
+        return [node.childNodes[offset - 1], getNodeLength(node.childNodes[offset - 1])];
+    }
+
+    // "Return null."
+    return null;
+}
+
+function getFirstEquivalentPoint(node, offset) {
+    // "While (node, offset)'s previous equivalent point is not null, set
+    // (node, offset) to its previous equivalent point."
+    var prev;
+    while (prev = getPreviousEquivalentPoint(node, offset)) {
+        node = prev[0];
+        offset = prev[1];
+    }
+
+    // "Return (node, offset)."
+    return [node, offset];
+}
+
+function getLastEquivalentPoint(node, offset) {
+    // "While (node, offset)'s next equivalent point is not null, set (node,
+    // offset) to its next equivalent point."
+    var next;
+    while (next = getNextEquivalentPoint(node, offset)) {
+        node = next[0];
+        offset = next[1];
+    }
+
+    // "Return (node, offset)."
+    return [node, offset];
+}
+
+//@}
+///// Block-extending a range /////
+//@{
+
+// "A boundary point (node, offset) is a block start point if either node's
+// parent is null and offset is zero; or node has a child with index offset −
+// 1, and that child is either a visible block node or a visible br."
+function isBlockStartPoint(node, offset) {
+    return (!node.parentNode && offset == 0)
+        || (0 <= offset - 1
+        && offset - 1 < node.childNodes.length
+        && isVisible(node.childNodes[offset - 1])
+        && (isBlockNode(node.childNodes[offset - 1])
+        || isHtmlElement(node.childNodes[offset - 1], "br")));
+}
+
+// "A boundary point (node, offset) is a block end point if either node's
+// parent is null and offset is node's length; or node has a child with index
+// offset, and that child is a visible block node."
+function isBlockEndPoint(node, offset) {
+    return (!node.parentNode && offset == getNodeLength(node))
+        || (offset < node.childNodes.length
+        && isVisible(node.childNodes[offset])
+        && isBlockNode(node.childNodes[offset]));
+}
+
+// "A boundary point is a block boundary point if it is either a block start
+// point or a block end point."
+function isBlockBoundaryPoint(node, offset) {
+    return isBlockStartPoint(node, offset)
+        || isBlockEndPoint(node, offset);
+}
+
+function blockExtend(range) {
+    // "Let start node, start offset, end node, and end offset be the start
+    // and end nodes and offsets of the range."
+    var startNode = range.startContainer;
+    var startOffset = range.startOffset;
+    var endNode = range.endContainer;
+    var endOffset = range.endOffset;
+
+    // "If some ancestor container of start node is an li, set start offset to
+    // the index of the last such li in tree order, and set start node to that
+    // li's parent."
+    var liAncestors = getAncestors(startNode).concat(startNode)
+        .filter(function(ancestor) { return isHtmlElement(ancestor, "li") })
+        .slice(-1);
+    if (liAncestors.length) {
+        startOffset = getNodeIndex(liAncestors[0]);
+        startNode = liAncestors[0].parentNode;
+    }
+
+    // "If (start node, start offset) is not a block start point, repeat the
+    // following steps:"
+    if (!isBlockStartPoint(startNode, startOffset)) do {
+        // "If start offset is zero, set it to start node's index, then set
+        // start node to its parent."
+        if (startOffset == 0) {
+            startOffset = getNodeIndex(startNode);
+            startNode = startNode.parentNode;
+
+        // "Otherwise, subtract one from start offset."
+        } else {
+            startOffset--;
+        }
+
+        // "If (start node, start offset) is a block boundary point, break from
+        // this loop."
+    } while (!isBlockBoundaryPoint(startNode, startOffset));
+
+    // "While start offset is zero and start node's parent is not null, set
+    // start offset to start node's index, then set start node to its parent."
+    while (startOffset == 0
+    && startNode.parentNode) {
+        startOffset = getNodeIndex(startNode);
+        startNode = startNode.parentNode;
+    }
+
+    // "If some ancestor container of end node is an li, set end offset to one
+    // plus the index of the last such li in tree order, and set end node to
+    // that li's parent."
+    var liAncestors = getAncestors(endNode).concat(endNode)
+        .filter(function(ancestor) { return isHtmlElement(ancestor, "li") })
+        .slice(-1);
+    if (liAncestors.length) {
+        endOffset = 1 + getNodeIndex(liAncestors[0]);
+        endNode = liAncestors[0].parentNode;
+    }
+
+    // "If (end node, end offset) is not a block end point, repeat the
+    // following steps:"
+    if (!isBlockEndPoint(endNode, endOffset)) do {
+        // "If end offset is end node's length, set it to one plus end node's
+        // index, then set end node to its parent."
+        if (endOffset == getNodeLength(endNode)) {
+            endOffset = 1 + getNodeIndex(endNode);
+            endNode = endNode.parentNode;
+
+        // "Otherwise, add one to end offset.
+        } else {
+            endOffset++;
+        }
+
+        // "If (end node, end offset) is a block boundary point, break from
+        // this loop."
+    } while (!isBlockBoundaryPoint(endNode, endOffset));
+
+    // "While end offset is end node's length and end node's parent is not
+    // null, set end offset to one plus end node's index, then set end node to
+    // its parent."
+    while (endOffset == getNodeLength(endNode)
+    && endNode.parentNode) {
+        endOffset = 1 + getNodeIndex(endNode);
+        endNode = endNode.parentNode;
+    }
+
+    // "Let new range be a new range whose start and end nodes and offsets
+    // are start node, start offset, end node, and end offset."
+    var newRange = startNode.ownerDocument.createRange();
+    newRange.setStart(startNode, startOffset);
+    newRange.setEnd(endNode, endOffset);
+
+    // "Return new range."
+    return newRange;
+}
+
+function followsLineBreak(node) {
+    // "Let offset be zero."
+    var offset = 0;
+
+    // "While (node, offset) is not a block boundary point:"
+    while (!isBlockBoundaryPoint(node, offset)) {
+        // "If node has a visible child with index offset minus one, return
+        // false."
+        if (0 <= offset - 1
+        && offset - 1 < node.childNodes.length
+        && isVisible(node.childNodes[offset - 1])) {
+            return false;
+        }
+
+        // "If offset is zero or node has no children, set offset to node's
+        // index, then set node to its parent."
+        if (offset == 0
+        || !node.hasChildNodes()) {
+            offset = getNodeIndex(node);
+            node = node.parentNode;
+
+        // "Otherwise, set node to its child with index offset minus one, then
+        // set offset to node's length."
+        } else {
+            node = node.childNodes[offset - 1];
+            offset = getNodeLength(node);
+        }
+    }
+
+    // "Return true."
+    return true;
+}
+
+function precedesLineBreak(node) {
+    // "Let offset be node's length."
+    var offset = getNodeLength(node);
+
+    // "While (node, offset) is not a block boundary point:"
+    while (!isBlockBoundaryPoint(node, offset)) {
+        // "If node has a visible child with index offset, return false."
+        if (offset < node.childNodes.length
+        && isVisible(node.childNodes[offset])) {
+            return false;
+        }
+
+        // "If offset is node's length or node has no children, set offset to
+        // one plus node's index, then set node to its parent."
+        if (offset == getNodeLength(node)
+        || !node.hasChildNodes()) {
+            offset = 1 + getNodeIndex(node);
+            node = node.parentNode;
+
+        // "Otherwise, set node to its child with index offset and set offset
+        // to zero."
+        } else {
+            node = node.childNodes[offset];
+            offset = 0;
+        }
+    }
+
+    // "Return true."
+    return true;
+}
+
+//@}
+///// Recording and restoring overrides /////
+//@{
+
+function recordCurrentOverrides() {
+    // "Let overrides be a list of (string, string or boolean) ordered pairs,
+    // initially empty."
+    var overrides = [];
+
+    // "If there is a value override for "createLink", add ("createLink", value
+    // override for "createLink") to overrides."
+    if (getValueOverride("createlink") !== undefined) {
+        overrides.push(["createlink", getValueOverride("createlink")]);
+    }
+
+    // "For each command in the list "bold", "italic", "strikethrough",
+    // "subscript", "superscript", "underline", in order: if there is a state
+    // override for command, add (command, command's state override) to
+    // overrides."
+    ["bold", "italic", "strikethrough", "subscript", "superscript",
+    "underline"].forEach(function(command) {
+        if (getStateOverride(command) !== undefined) {
+            overrides.push([command, getStateOverride(command)]);
+        }
+    });
+
+    // "For each command in the list "fontName", "fontSize", "foreColor",
+    // "hiliteColor", in order: if there is a value override for command, add
+    // (command, command's value override) to overrides."
+    ["fontname", "fontsize", "forecolor",
+    "hilitecolor"].forEach(function(command) {
+        if (getValueOverride(command) !== undefined) {
+            overrides.push([command, getValueOverride(command)]);
+        }
+    });
+
+    // "Return overrides."
+    return overrides;
+}
+
+function recordCurrentStatesAndValues() {
+    // "Let overrides be a list of (string, string or boolean) ordered pairs,
+    // initially empty."
+    var overrides = [];
+
+    // "Let node be the first formattable node effectively contained in the
+    // active range, or null if there is none."
+    var node = getAllEffectivelyContainedNodes(getActiveRange())
+        .filter(isFormattableNode)[0];
+
+    // "If node is null, return overrides."
+    if (!node) {
+        return overrides;
+    }
+
+    // "Add ("createLink", node's effective command value for "createLink") to
+    // overrides."
+    overrides.push(["createlink", getEffectiveCommandValue(node, "createlink")]);
+
+    // "For each command in the list "bold", "italic", "strikethrough",
+    // "subscript", "superscript", "underline", in order: if node's effective
+    // command value for command is one of its inline command activated values,
+    // add (command, true) to overrides, and otherwise add (command, false) to
+    // overrides."
+    ["bold", "italic", "strikethrough", "subscript", "superscript",
+    "underline"].forEach(function(command) {
+        if (commands[command].inlineCommandActivatedValues
+        .indexOf(getEffectiveCommandValue(node, command)) != -1) {
+            overrides.push([command, true]);
+        } else {
+            overrides.push([command, false]);
+        }
+    });
+
+    // "For each command in the list "fontName", "foreColor", "hiliteColor", in
+    // order: add (command, command's value) to overrides."
+    ["fontname", "fontsize", "forecolor", "hilitecolor"].forEach(function(command) {
+        overrides.push([command, commands[command].value()]);
+    });
+
+    // "Add ("fontSize", node's effective command value for "fontSize") to
+    // overrides."
+    overrides.push(["fontsize", getEffectiveCommandValue(node, "fontsize")]);
+
+    // "Return overrides."
+    return overrides;
+}
+
+function restoreStatesAndValues(overrides) {
+    // "Let node be the first formattable node effectively contained in the
+    // active range, or null if there is none."
+    var node = getAllEffectivelyContainedNodes(getActiveRange())
+        .filter(isFormattableNode)[0];
+
+    // "If node is not null, then for each (command, override) pair in
+    // overrides, in order:"
+    if (node) {
+        for (var i = 0; i < overrides.length; i++) {
+            var command = overrides[i][0];
+            var override = overrides[i][1];
+
+            // "If override is a boolean, and queryCommandState(command)
+            // returns something different from override, take the action for
+            // command, with value equal to the empty string."
+            if (typeof override == "boolean"
+            && myQueryCommandState(command) != override) {
+                commands[command].action("");
+
+            // "Otherwise, if override is a string, and command is neither
+            // "createLink" nor "fontSize", and queryCommandValue(command)
+            // returns something not equivalent to override, take the action
+            // for command, with value equal to override."
+            } else if (typeof override == "string"
+            && command != "createlink"
+            && command != "fontsize"
+            && !areEquivalentValues(command, myQueryCommandValue(command), override)) {
+                commands[command].action(override);
+
+            // "Otherwise, if override is a string; and command is
+            // "createLink"; and either there is a value override for
+            // "createLink" that is not equal to override, or there is no value
+            // override for "createLink" and node's effective command value for
+            // "createLink" is not equal to override: take the action for
+            // "createLink", with value equal to override."
+            } else if (typeof override == "string"
+            && command == "createlink"
+            && (
+                (
+                    getValueOverride("createlink") !== undefined
+                    && getValueOverride("createlink") !== override
+                ) || (
+                    getValueOverride("createlink") === undefined
+                    && getEffectiveCommandValue(node, "createlink") !== override
+                )
+            )) {
+                commands.createlink.action(override);
+
+            // "Otherwise, if override is a string; and command is "fontSize";
+            // and either there is a value override for "fontSize" that is not
+            // equal to override, or there is no value override for "fontSize"
+            // and node's effective command value for "fontSize" is not loosely
+            // equivalent to override:"
+            } else if (typeof override == "string"
+            && command == "fontsize"
+            && (
+                (
+                    getValueOverride("fontsize") !== undefined
+                    && getValueOverride("fontsize") !== override
+                ) || (
+                    getValueOverride("fontsize") === undefined
+                    && !areLooselyEquivalentValues(command, getEffectiveCommandValue(node, "fontsize"), override)
+                )
+            )) {
+                // "Convert override to an integer number of pixels, and set
+                // override to the legacy font size for the result."
+                override = getLegacyFontSize(override);
+
+                // "Take the action for "fontSize", with value equal to
+                // override."
+                commands.fontsize.action(override);
+
+            // "Otherwise, continue this loop from the beginning."
+            } else {
+                continue;
+            }
+
+            // "Set node to the first formattable node effectively contained in
+            // the active range, if there is one."
+            node = getAllEffectivelyContainedNodes(getActiveRange())
+                .filter(isFormattableNode)[0]
+                || node;
+        }
+
+    // "Otherwise, for each (command, override) pair in overrides, in order:"
+    } else {
+        for (var i = 0; i < overrides.length; i++) {
+            var command = overrides[i][0];
+            var override = overrides[i][1];
+
+            // "If override is a boolean, set the state override for command to
+            // override."
+            if (typeof override == "boolean") {
+                setStateOverride(command, override);
+            }
+
+            // "If override is a string, set the value override for command to
+            // override."
+            if (typeof override == "string") {
+                setValueOverride(command, override);
+            }
+        }
+    }
+}
+
+//@}
+///// Deleting the selection /////
+//@{
+
+// The flags argument is a dictionary that can have blockMerging,
+// stripWrappers, and/or direction as keys.
+function deleteSelection(flags) {
+    if (flags === undefined) {
+        flags = {};
+    }
+
+    var blockMerging = "blockMerging" in flags ? Boolean(flags.blockMerging) : true;
+    var stripWrappers = "stripWrappers" in flags ? Boolean(flags.stripWrappers) : true;
+    var direction = "direction" in flags ? flags.direction : "forward";
+
+    // "If the active range is null, abort these steps and do nothing."
+    if (!getActiveRange()) {
+        return;
+    }
+
+    // "Canonicalize whitespace at the active range's start."
+    canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);
+
+    // "Canonicalize whitespace at the active range's end."
+    canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset);
+
+    // "Let (start node, start offset) be the last equivalent point for the
+    // active range's start."
+    var start = getLastEquivalentPoint(getActiveRange().startContainer, getActiveRange().startOffset);
+    var startNode = start[0];
+    var startOffset = start[1];
+
+    // "Let (end node, end offset) be the first equivalent point for the active
+    // range's end."
+    var end = getFirstEquivalentPoint(getActiveRange().endContainer, getActiveRange().endOffset);
+    var endNode = end[0];
+    var endOffset = end[1];
+
+    // "If (end node, end offset) is not after (start node, start offset):"
+    if (getPosition(endNode, endOffset, startNode, startOffset) !== "after") {
+        // "If direction is "forward", call collapseToStart() on the context
+        // object's Selection."
+        //
+        // Here and in a few other places, we check rangeCount to work around a
+        // WebKit bug: it will sometimes incorrectly remove ranges from the
+        // selection if nodes are removed, so collapseToStart() will throw.
+        // This will break everything if we're using an actual selection, but
+        // if getActiveRange() is really just returning globalRange and that's
+        // all we care about, it will work fine.  I only add the extra check
+        // for errors I actually hit in testing.
+        if (direction == "forward") {
+            if (getSelection().rangeCount) {
+                getSelection().collapseToStart();
+            }
+            getActiveRange().collapse(true);
+
+        // "Otherwise, call collapseToEnd() on the context object's Selection."
+        } else {
+            getSelection().collapseToEnd();
+            getActiveRange().collapse(false);
+        }
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "If start node is a Text node and start offset is 0, set start offset to
+    // the index of start node, then set start node to its parent."
+    if (startNode.nodeType == Node.TEXT_NODE
+    && startOffset == 0) {
+        startOffset = getNodeIndex(startNode);
+        startNode = startNode.parentNode;
+    }
+
+    // "If end node is a Text node and end offset is its length, set end offset
+    // to one plus the index of end node, then set end node to its parent."
+    if (endNode.nodeType == Node.TEXT_NODE
+    && endOffset == getNodeLength(endNode)) {
+        endOffset = 1 + getNodeIndex(endNode);
+        endNode = endNode.parentNode;
+    }
+
+    // "Call collapse(start node, start offset) on the context object's
+    // Selection."
+    getSelection().collapse(startNode, startOffset);
+    getActiveRange().setStart(startNode, startOffset);
+
+    // "Call extend(end node, end offset) on the context object's Selection."
+    getSelection().extend(endNode, endOffset);
+    getActiveRange().setEnd(endNode, endOffset);
+
+    // "Let start block be the active range's start node."
+    var startBlock = getActiveRange().startContainer;
+
+    // "While start block's parent is in the same editing host and start block
+    // is an inline node, set start block to its parent."
+    while (inSameEditingHost(startBlock, startBlock.parentNode)
+    && isInlineNode(startBlock)) {
+        startBlock = startBlock.parentNode;
+    }
+
+    // "If start block is neither a block node nor an editing host, or "span"
+    // is not an allowed child of start block, or start block is a td or th,
+    // set start block to null."
+    if ((!isBlockNode(startBlock) && !isEditingHost(startBlock))
+    || !isAllowedChild("span", startBlock)
+    || isHtmlElement(startBlock, ["td", "th"])) {
+        startBlock = null;
+    }
+
+    // "Let end block be the active range's end node."
+    var endBlock = getActiveRange().endContainer;
+
+    // "While end block's parent is in the same editing host and end block is
+    // an inline node, set end block to its parent."
+    while (inSameEditingHost(endBlock, endBlock.parentNode)
+    && isInlineNode(endBlock)) {
+        endBlock = endBlock.parentNode;
+    }
+
+    // "If end block is neither a block node nor an editing host, or "span" is
+    // not an allowed child of end block, or end block is a td or th, set end
+    // block to null."
+    if ((!isBlockNode(endBlock) && !isEditingHost(endBlock))
+    || !isAllowedChild("span", endBlock)
+    || isHtmlElement(endBlock, ["td", "th"])) {
+        endBlock = null;
+    }
+
+    // "Record current states and values, and let overrides be the result."
+    var overrides = recordCurrentStatesAndValues();
+
+    // "If start node and end node are the same, and start node is an editable
+    // Text node:"
+    if (startNode == endNode
+    && isEditable(startNode)
+    && startNode.nodeType == Node.TEXT_NODE) {
+        // "Call deleteData(start offset, end offset − start offset) on start
+        // node."
+        startNode.deleteData(startOffset, endOffset - startOffset);
+
+        // "Canonicalize whitespace at (start node, start offset), with fix
+        // collapsed space false."
+        canonicalizeWhitespace(startNode, startOffset, false);
+
+        // "If direction is "forward", call collapseToStart() on the context
+        // object's Selection."
+        if (direction == "forward") {
+            if (getSelection().rangeCount) {
+                getSelection().collapseToStart();
+            }
+            getActiveRange().collapse(true);
+
+        // "Otherwise, call collapseToEnd() on the context object's Selection."
+        } else {
+            getSelection().collapseToEnd();
+            getActiveRange().collapse(false);
+        }
+
+        // "Restore states and values from overrides."
+        restoreStatesAndValues(overrides);
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "If start node is an editable Text node, call deleteData() on it, with
+    // start offset as the first argument and (length of start node − start
+    // offset) as the second argument."
+    if (isEditable(startNode)
+    && startNode.nodeType == Node.TEXT_NODE) {
+        startNode.deleteData(startOffset, getNodeLength(startNode) - startOffset);
+    }
+
+    // "Let node list be a list of nodes, initially empty."
+    //
+    // "For each node contained in the active range, append node to node list
+    // if the last member of node list (if any) is not an ancestor of node;
+    // node is editable; and node is not a thead, tbody, tfoot, tr, th, or td."
+    var nodeList = getContainedNodes(getActiveRange(),
+        function(node) {
+            return isEditable(node)
+                && !isHtmlElement(node, ["thead", "tbody", "tfoot", "tr", "th", "td"]);
+        }
+    );
+
+    // "For each node in node list:"
+    for (var i = 0; i < nodeList.length; i++) {
+        var node = nodeList[i];
+
+        // "Let parent be the parent of node."
+        var parent_ = node.parentNode;
+
+        // "Remove node from parent."
+        parent_.removeChild(node);
+
+        // "If the block node of parent has no visible children, and parent is
+        // editable or an editing host, call createElement("br") on the context
+        // object and append the result as the last child of parent."
+        if (![].some.call(getBlockNodeOf(parent_).childNodes, isVisible)
+        && (isEditable(parent_) || isEditingHost(parent_))) {
+            parent_.appendChild(document.createElement("br"));
+        }
+
+        // "If strip wrappers is true or parent is not an ancestor container of
+        // start node, while parent is an editable inline node with length 0,
+        // let grandparent be the parent of parent, then remove parent from
+        // grandparent, then set parent to grandparent."
+        if (stripWrappers
+        || (!isAncestor(parent_, startNode) && parent_ != startNode)) {
+            while (isEditable(parent_)
+            && isInlineNode(parent_)
+            && getNodeLength(parent_) == 0) {
+                var grandparent = parent_.parentNode;
+                grandparent.removeChild(parent_);
+                parent_ = grandparent;
+            }
+        }
+    }
+
+    // "If end node is an editable Text node, call deleteData(0, end offset) on
+    // it."
+    if (isEditable(endNode)
+    && endNode.nodeType == Node.TEXT_NODE) {
+        endNode.deleteData(0, endOffset);
+    }
+
+    // "Canonicalize whitespace at the active range's start, with fix collapsed
+    // space false."
+    canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset, false);
+
+    // "Canonicalize whitespace at the active range's end, with fix collapsed
+    // space false."
+    canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset, false);
+
+    // "If block merging is false, or start block or end block is null, or
+    // start block is not in the same editing host as end block, or start block
+    // and end block are the same:"
+    if (!blockMerging
+    || !startBlock
+    || !endBlock
+    || !inSameEditingHost(startBlock, endBlock)
+    || startBlock == endBlock) {
+        // "If direction is "forward", call collapseToStart() on the context
+        // object's Selection."
+        if (direction == "forward") {
+            if (getSelection().rangeCount) {
+                getSelection().collapseToStart();
+            }
+            getActiveRange().collapse(true);
+
+        // "Otherwise, call collapseToEnd() on the context object's Selection."
+        } else {
+            if (getSelection().rangeCount) {
+                getSelection().collapseToEnd();
+            }
+            getActiveRange().collapse(false);
+        }
+
+        // "Restore states and values from overrides."
+        restoreStatesAndValues(overrides);
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "If start block has one child, which is a collapsed block prop, remove
+    // its child from it."
+    if (startBlock.children.length == 1
+    && isCollapsedBlockProp(startBlock.firstChild)) {
+        startBlock.removeChild(startBlock.firstChild);
+    }
+
+    // "If start block is an ancestor of end block:"
+    if (isAncestor(startBlock, endBlock)) {
+        // "Let reference node be end block."
+        var referenceNode = endBlock;
+
+        // "While reference node is not a child of start block, set reference
+        // node to its parent."
+        while (referenceNode.parentNode != startBlock) {
+            referenceNode = referenceNode.parentNode;
+        }
+
+        // "Call collapse() on the context object's Selection, with first
+        // argument start block and second argument the index of reference
+        // node."
+        getSelection().collapse(startBlock, getNodeIndex(referenceNode));
+        getActiveRange().setStart(startBlock, getNodeIndex(referenceNode));
+        getActiveRange().collapse(true);
+
+        // "If end block has no children:"
+        if (!endBlock.hasChildNodes()) {
+            // "While end block is editable and is the only child of its parent
+            // and is not a child of start block, let parent equal end block,
+            // then remove end block from parent, then set end block to
+            // parent."
+            while (isEditable(endBlock)
+            && endBlock.parentNode.childNodes.length == 1
+            && endBlock.parentNode != startBlock) {
+                var parent_ = endBlock;
+                parent_.removeChild(endBlock);
+                endBlock = parent_;
+            }
+
+            // "If end block is editable and is not an inline node, and its
+            // previousSibling and nextSibling are both inline nodes, call
+            // createElement("br") on the context object and insert it into end
+            // block's parent immediately after end block."
+            if (isEditable(endBlock)
+            && !isInlineNode(endBlock)
+            && isInlineNode(endBlock.previousSibling)
+            && isInlineNode(endBlock.nextSibling)) {
+                endBlock.parentNode.insertBefore(document.createElement("br"), endBlock.nextSibling);
+            }
+
+            // "If end block is editable, remove it from its parent."
+            if (isEditable(endBlock)) {
+                endBlock.parentNode.removeChild(endBlock);
+            }
+
+            // "Restore states and values from overrides."
+            restoreStatesAndValues(overrides);
+
+            // "Abort these steps."
+            return;
+        }
+
+        // "If end block's firstChild is not an inline node, restore states and
+        // values from overrides, then abort these steps."
+        if (!isInlineNode(endBlock.firstChild)) {
+            restoreStatesAndValues(overrides);
+            return;
+        }
+
+        // "Let children be a list of nodes, initially empty."
+        var children = [];
+
+        // "Append the first child of end block to children."
+        children.push(endBlock.firstChild);
+
+        // "While children's last member is not a br, and children's last
+        // member's nextSibling is an inline node, append children's last
+        // member's nextSibling to children."
+        while (!isHtmlElement(children[children.length - 1], "br")
+        && isInlineNode(children[children.length - 1].nextSibling)) {
+            children.push(children[children.length - 1].nextSibling);
+        }
+
+        // "Record the values of children, and let values be the result."
+        var values = recordValues(children);
+
+        // "While children's first member's parent is not start block, split
+        // the parent of children."
+        while (children[0].parentNode != startBlock) {
+            splitParent(children);
+        }
+
+        // "If children's first member's previousSibling is an editable br,
+        // remove that br from its parent."
+        if (isEditable(children[0].previousSibling)
+        && isHtmlElement(children[0].previousSibling, "br")) {
+            children[0].parentNode.removeChild(children[0].previousSibling);
+        }
+
+    // "Otherwise, if start block is a descendant of end block:"
+    } else if (isDescendant(startBlock, endBlock)) {
+        // "Call collapse() on the context object's Selection, with first
+        // argument start block and second argument start block's length."
+        getSelection().collapse(startBlock, getNodeLength(startBlock));
+        getActiveRange().setStart(startBlock, getNodeLength(startBlock));
+        getActiveRange().collapse(true);
+
+        // "Let reference node be start block."
+        var referenceNode = startBlock;
+
+        // "While reference node is not a child of end block, set reference
+        // node to its parent."
+        while (referenceNode.parentNode != endBlock) {
+            referenceNode = referenceNode.parentNode;
+        }
+
+        // "If reference node's nextSibling is an inline node and start block's
+        // lastChild is a br, remove start block's lastChild from it."
+        if (isInlineNode(referenceNode.nextSibling)
+        && isHtmlElement(startBlock.lastChild, "br")) {
+            startBlock.removeChild(startBlock.lastChild);
+        }
+
+        // "Let nodes to move be a list of nodes, initially empty."
+        var nodesToMove = [];
+
+        // "If reference node's nextSibling is neither null nor a block node,
+        // append it to nodes to move."
+        if (referenceNode.nextSibling
+        && !isBlockNode(referenceNode.nextSibling)) {
+            nodesToMove.push(referenceNode.nextSibling);
+        }
+
+        // "While nodes to move is nonempty and its last member isn't a br and
+        // its last member's nextSibling is neither null nor a block node,
+        // append its last member's nextSibling to nodes to move."
+        if (nodesToMove.length
+        && !isHtmlElement(nodesToMove[nodesToMove.length - 1], "br")
+        && nodesToMove[nodesToMove.length - 1].nextSibling
+        && !isBlockNode(nodesToMove[nodesToMove.length - 1].nextSibling)) {
+            nodesToMove.push(nodesToMove[nodesToMove.length - 1].nextSibling);
+        }
+
+        // "Record the values of nodes to move, and let values be the result."
+        var values = recordValues(nodesToMove);
+
+        // "For each node in nodes to move, append node as the last child of
+        // start block, preserving ranges."
+        nodesToMove.forEach(function(node) {
+            movePreservingRanges(node, startBlock, -1);
+        });
+
+    // "Otherwise:"
+    } else {
+        // "Call collapse() on the context object's Selection, with first
+        // argument start block and second argument start block's length."
+        getSelection().collapse(startBlock, getNodeLength(startBlock));
+        getActiveRange().setStart(startBlock, getNodeLength(startBlock));
+        getActiveRange().collapse(true);
+
+        // "If end block's firstChild is an inline node and start block's
+        // lastChild is a br, remove start block's lastChild from it."
+        if (isInlineNode(endBlock.firstChild)
+        && isHtmlElement(startBlock.lastChild, "br")) {
+            startBlock.removeChild(startBlock.lastChild);
+        }
+
+        // "Record the values of end block's children, and let values be the
+        // result."
+        var values = recordValues([].slice.call(endBlock.childNodes));
+
+        // "While end block has children, append the first child of end block
+        // to start block, preserving ranges."
+        while (endBlock.hasChildNodes()) {
+            movePreservingRanges(endBlock.firstChild, startBlock, -1);
+        }
+
+        // "While end block has no children, let parent be the parent of end
+        // block, then remove end block from parent, then set end block to
+        // parent."
+        while (!endBlock.hasChildNodes()) {
+            var parent_ = endBlock.parentNode;
+            parent_.removeChild(endBlock);
+            endBlock = parent_;
+        }
+    }
+
+    // "Let ancestor be start block."
+    var ancestor = startBlock;
+
+    // "While ancestor has an inclusive ancestor ol in the same editing host
+    // whose nextSibling is also an ol in the same editing host, or an
+    // inclusive ancestor ul in the same editing host whose nextSibling is also
+    // a ul in the same editing host:"
+    while (getInclusiveAncestors(ancestor).some(function(node) {
+        return inSameEditingHost(ancestor, node)
+            && (
+                (isHtmlElement(node, "ol") && isHtmlElement(node.nextSibling, "ol"))
+                || (isHtmlElement(node, "ul") && isHtmlElement(node.nextSibling, "ul"))
+            ) && inSameEditingHost(ancestor, node.nextSibling);
+    })) {
+        // "While ancestor and its nextSibling are not both ols in the same
+        // editing host, and are also not both uls in the same editing host,
+        // set ancestor to its parent."
+        while (!(
+            isHtmlElement(ancestor, "ol")
+            && isHtmlElement(ancestor.nextSibling, "ol")
+            && inSameEditingHost(ancestor, ancestor.nextSibling)
+        ) && !(
+            isHtmlElement(ancestor, "ul")
+            && isHtmlElement(ancestor.nextSibling, "ul")
+            && inSameEditingHost(ancestor, ancestor.nextSibling)
+        )) {
+            ancestor = ancestor.parentNode;
+        }
+
+        // "While ancestor's nextSibling has children, append ancestor's
+        // nextSibling's firstChild as the last child of ancestor, preserving
+        // ranges."
+        while (ancestor.nextSibling.hasChildNodes()) {
+            movePreservingRanges(ancestor.nextSibling.firstChild, ancestor, -1);
+        }
+
+        // "Remove ancestor's nextSibling from its parent."
+        ancestor.parentNode.removeChild(ancestor.nextSibling);
+    }
+
+    // "Restore the values from values."
+    restoreValues(values);
+
+    // "If start block has no children, call createElement("br") on the context
+    // object and append the result as the last child of start block."
+    if (!startBlock.hasChildNodes()) {
+        startBlock.appendChild(document.createElement("br"));
+    }
+
+    // "Remove extraneous line breaks at the end of start block."
+    removeExtraneousLineBreaksAtTheEndOf(startBlock);
+
+    // "Restore states and values from overrides."
+    restoreStatesAndValues(overrides);
+}
+
+
+//@}
+///// Splitting a node list's parent /////
+//@{
+
+function splitParent(nodeList) {
+    // "Let original parent be the parent of the first member of node list."
+    var originalParent = nodeList[0].parentNode;
+
+    // "If original parent is not editable or its parent is null, do nothing
+    // and abort these steps."
+    if (!isEditable(originalParent)
+    || !originalParent.parentNode) {
+        return;
+    }
+
+    // "If the first child of original parent is in node list, remove
+    // extraneous line breaks before original parent."
+    if (nodeList.indexOf(originalParent.firstChild) != -1) {
+        removeExtraneousLineBreaksBefore(originalParent);
+    }
+
+    // "If the first child of original parent is in node list, and original
+    // parent follows a line break, set follows line break to true. Otherwise,
+    // set follows line break to false."
+    var followsLineBreak_ = nodeList.indexOf(originalParent.firstChild) != -1
+        && followsLineBreak(originalParent);
+
+    // "If the last child of original parent is in node list, and original
+    // parent precedes a line break, set precedes line break to true.
+    // Otherwise, set precedes line break to false."
+    var precedesLineBreak_ = nodeList.indexOf(originalParent.lastChild) != -1
+        && precedesLineBreak(originalParent);
+
+    // "If the first child of original parent is not in node list, but its last
+    // child is:"
+    if (nodeList.indexOf(originalParent.firstChild) == -1
+    && nodeList.indexOf(originalParent.lastChild) != -1) {
+        // "For each node in node list, in reverse order, insert node into the
+        // parent of original parent immediately after original parent,
+        // preserving ranges."
+        for (var i = nodeList.length - 1; i >= 0; i--) {
+            movePreservingRanges(nodeList[i], originalParent.parentNode, 1 + getNodeIndex(originalParent));
+        }
+
+        // "If precedes line break is true, and the last member of node list
+        // does not precede a line break, call createElement("br") on the
+        // context object and insert the result immediately after the last
+        // member of node list."
+        if (precedesLineBreak_
+        && !precedesLineBreak(nodeList[nodeList.length - 1])) {
+            nodeList[nodeList.length - 1].parentNode.insertBefore(document.createElement("br"), nodeList[nodeList.length - 1].nextSibling);
+        }
+
+        // "Remove extraneous line breaks at the end of original parent."
+        removeExtraneousLineBreaksAtTheEndOf(originalParent);
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "If the first child of original parent is not in node list:"
+    if (nodeList.indexOf(originalParent.firstChild) == -1) {
+        // "Let cloned parent be the result of calling cloneNode(false) on
+        // original parent."
+        var clonedParent = originalParent.cloneNode(false);
+
+        // "If original parent has an id attribute, unset it."
+        originalParent.removeAttribute("id");
+
+        // "Insert cloned parent into the parent of original parent immediately
+        // before original parent."
+        originalParent.parentNode.insertBefore(clonedParent, originalParent);
+
+        // "While the previousSibling of the first member of node list is not
+        // null, append the first child of original parent as the last child of
+        // cloned parent, preserving ranges."
+        while (nodeList[0].previousSibling) {
+            movePreservingRanges(originalParent.firstChild, clonedParent, clonedParent.childNodes.length);
+        }
+    }
+
+    // "For each node in node list, insert node into the parent of original
+    // parent immediately before original parent, preserving ranges."
+    for (var i = 0; i < nodeList.length; i++) {
+        movePreservingRanges(nodeList[i], originalParent.parentNode, getNodeIndex(originalParent));
+    }
+
+    // "If follows line break is true, and the first member of node list does
+    // not follow a line break, call createElement("br") on the context object
+    // and insert the result immediately before the first member of node list."
+    if (followsLineBreak_
+    && !followsLineBreak(nodeList[0])) {
+        nodeList[0].parentNode.insertBefore(document.createElement("br"), nodeList[0]);
+    }
+
+    // "If the last member of node list is an inline node other than a br, and
+    // the first child of original parent is a br, and original parent is not
+    // an inline node, remove the first child of original parent from original
+    // parent."
+    if (isInlineNode(nodeList[nodeList.length - 1])
+    && !isHtmlElement(nodeList[nodeList.length - 1], "br")
+    && isHtmlElement(originalParent.firstChild, "br")
+    && !isInlineNode(originalParent)) {
+        originalParent.removeChild(originalParent.firstChild);
+    }
+
+    // "If original parent has no children:"
+    if (!originalParent.hasChildNodes()) {
+        // "Remove original parent from its parent."
+        originalParent.parentNode.removeChild(originalParent);
+
+        // "If precedes line break is true, and the last member of node list
+        // does not precede a line break, call createElement("br") on the
+        // context object and insert the result immediately after the last
+        // member of node list."
+        if (precedesLineBreak_
+        && !precedesLineBreak(nodeList[nodeList.length - 1])) {
+            nodeList[nodeList.length - 1].parentNode.insertBefore(document.createElement("br"), nodeList[nodeList.length - 1].nextSibling);
+        }
+
+    // "Otherwise, remove extraneous line breaks before original parent."
+    } else {
+        removeExtraneousLineBreaksBefore(originalParent);
+    }
+
+    // "If node list's last member's nextSibling is null, but its parent is not
+    // null, remove extraneous line breaks at the end of node list's last
+    // member's parent."
+    if (!nodeList[nodeList.length - 1].nextSibling
+    && nodeList[nodeList.length - 1].parentNode) {
+        removeExtraneousLineBreaksAtTheEndOf(nodeList[nodeList.length - 1].parentNode);
+    }
+}
+
+// "To remove a node node while preserving its descendants, split the parent of
+// node's children if it has any. If it has no children, instead remove it from
+// its parent."
+function removePreservingDescendants(node) {
+    if (node.hasChildNodes()) {
+        splitParent([].slice.call(node.childNodes));
+    } else {
+        node.parentNode.removeChild(node);
+    }
+}
+
+
+//@}
+///// Canonical space sequences /////
+//@{
+
+function canonicalSpaceSequence(n, nonBreakingStart, nonBreakingEnd) {
+    // "If n is zero, return the empty string."
+    if (n == 0) {
+        return "";
+    }
+
+    // "If n is one and both non-breaking start and non-breaking end are false,
+    // return a single space (U+0020)."
+    if (n == 1 && !nonBreakingStart && !nonBreakingEnd) {
+        return " ";
+    }
+
+    // "If n is one, return a single non-breaking space (U+00A0)."
+    if (n == 1) {
+        return "\xa0";
+    }
+
+    // "Let buffer be the empty string."
+    var buffer = "";
+
+    // "If non-breaking start is true, let repeated pair be U+00A0 U+0020.
+    // Otherwise, let it be U+0020 U+00A0."
+    var repeatedPair;
+    if (nonBreakingStart) {
+        repeatedPair = "\xa0 ";
+    } else {
+        repeatedPair = " \xa0";
+    }
+
+    // "While n is greater than three, append repeated pair to buffer and
+    // subtract two from n."
+    while (n > 3) {
+        buffer += repeatedPair;
+        n -= 2;
+    }
+
+    // "If n is three, append a three-element string to buffer depending on
+    // non-breaking start and non-breaking end:"
+    if (n == 3) {
+        buffer +=
+            !nonBreakingStart && !nonBreakingEnd ? " \xa0 "
+            : nonBreakingStart && !nonBreakingEnd ? "\xa0\xa0 "
+            : !nonBreakingStart && nonBreakingEnd ? " \xa0\xa0"
+            : nonBreakingStart && nonBreakingEnd ? "\xa0 \xa0"
+            : "impossible";
+
+    // "Otherwise, append a two-element string to buffer depending on
+    // non-breaking start and non-breaking end:"
+    } else {
+        buffer +=
+            !nonBreakingStart && !nonBreakingEnd ? "\xa0 "
+            : nonBreakingStart && !nonBreakingEnd ? "\xa0 "
+            : !nonBreakingStart && nonBreakingEnd ? " \xa0"
+            : nonBreakingStart && nonBreakingEnd ? "\xa0\xa0"
+            : "impossible";
+    }
+
+    // "Return buffer."
+    return buffer;
+}
+
+function canonicalizeWhitespace(node, offset, fixCollapsedSpace) {
+    if (fixCollapsedSpace === undefined) {
+        // "an optional boolean argument fix collapsed space that defaults to
+        // true"
+        fixCollapsedSpace = true;
+    }
+
+    // "If node is neither editable nor an editing host, abort these steps."
+    if (!isEditable(node) && !isEditingHost(node)) {
+        return;
+    }
+
+    // "Let start node equal node and let start offset equal offset."
+    var startNode = node;
+    var startOffset = offset;
+
+    // "Repeat the following steps:"
+    while (true) {
+        // "If start node has a child in the same editing host with index start
+        // offset minus one, set start node to that child, then set start
+        // offset to start node's length."
+        if (0 <= startOffset - 1
+        && inSameEditingHost(startNode, startNode.childNodes[startOffset - 1])) {
+            startNode = startNode.childNodes[startOffset - 1];
+            startOffset = getNodeLength(startNode);
+
+        // "Otherwise, if start offset is zero and start node does not follow a
+        // line break and start node's parent is in the same editing host, set
+        // start offset to start node's index, then set start node to its
+        // parent."
+        } else if (startOffset == 0
+        && !followsLineBreak(startNode)
+        && inSameEditingHost(startNode, startNode.parentNode)) {
+            startOffset = getNodeIndex(startNode);
+            startNode = startNode.parentNode;
+
+        // "Otherwise, if start node is a Text node and its parent's resolved
+        // value for "white-space" is neither "pre" nor "pre-wrap" and start
+        // offset is not zero and the (start offset − 1)st element of start
+        // node's data is a space (0x0020) or non-breaking space (0x00A0),
+        // subtract one from start offset."
+        } else if (startNode.nodeType == Node.TEXT_NODE
+        && ["pre", "pre-wrap"].indexOf(getComputedStyle(startNode.parentNode).whiteSpace) == -1
+        && startOffset != 0
+        && /[ \xa0]/.test(startNode.data[startOffset - 1])) {
+            startOffset--;
+
+        // "Otherwise, break from this loop."
+        } else {
+            break;
+        }
+    }
+
+    // "Let end node equal start node and end offset equal start offset."
+    var endNode = startNode;
+    var endOffset = startOffset;
+
+    // "Let length equal zero."
+    var length = 0;
+
+    // "Let collapse spaces be true if start offset is zero and start node
+    // follows a line break, otherwise false."
+    var collapseSpaces = startOffset == 0 && followsLineBreak(startNode);
+
+    // "Repeat the following steps:"
+    while (true) {
+        // "If end node has a child in the same editing host with index end
+        // offset, set end node to that child, then set end offset to zero."
+        if (endOffset < endNode.childNodes.length
+        && inSameEditingHost(endNode, endNode.childNodes[endOffset])) {
+            endNode = endNode.childNodes[endOffset];
+            endOffset = 0;
+
+        // "Otherwise, if end offset is end node's length and end node does not
+        // precede a line break and end node's parent is in the same editing
+        // host, set end offset to one plus end node's index, then set end node
+        // to its parent."
+        } else if (endOffset == getNodeLength(endNode)
+        && !precedesLineBreak(endNode)
+        && inSameEditingHost(endNode, endNode.parentNode)) {
+            endOffset = 1 + getNodeIndex(endNode);
+            endNode = endNode.parentNode;
+
+        // "Otherwise, if end node is a Text node and its parent's resolved
+        // value for "white-space" is neither "pre" nor "pre-wrap" and end
+        // offset is not end node's length and the end offsetth element of
+        // end node's data is a space (0x0020) or non-breaking space (0x00A0):"
+        } else if (endNode.nodeType == Node.TEXT_NODE
+        && ["pre", "pre-wrap"].indexOf(getComputedStyle(endNode.parentNode).whiteSpace) == -1
+        && endOffset != getNodeLength(endNode)
+        && /[ \xa0]/.test(endNode.data[endOffset])) {
+            // "If fix collapsed space is true, and collapse spaces is true,
+            // and the end offsetth code unit of end node's data is a space
+            // (0x0020): call deleteData(end offset, 1) on end node, then
+            // continue this loop from the beginning."
+            if (fixCollapsedSpace
+            && collapseSpaces
+            && " " == endNode.data[endOffset]) {
+                endNode.deleteData(endOffset, 1);
+                continue;
+            }
+
+            // "Set collapse spaces to true if the end offsetth element of end
+            // node's data is a space (0x0020), false otherwise."
+            collapseSpaces = " " == endNode.data[endOffset];
+
+            // "Add one to end offset."
+            endOffset++;
+
+            // "Add one to length."
+            length++;
+
+        // "Otherwise, break from this loop."
+        } else {
+            break;
+        }
+    }
+
+    // "If fix collapsed space is true, then while (start node, start offset)
+    // is before (end node, end offset):"
+    if (fixCollapsedSpace) {
+        while (getPosition(startNode, startOffset, endNode, endOffset) == "before") {
+            // "If end node has a child in the same editing host with index end
+            // offset − 1, set end node to that child, then set end offset to end
+            // node's length."
+            if (0 <= endOffset - 1
+            && endOffset - 1 < endNode.childNodes.length
+            && inSameEditingHost(endNode, endNode.childNodes[endOffset - 1])) {
+                endNode = endNode.childNodes[endOffset - 1];
+                endOffset = getNodeLength(endNode);
+
+            // "Otherwise, if end offset is zero and end node's parent is in the
+            // same editing host, set end offset to end node's index, then set end
+            // node to its parent."
+            } else if (endOffset == 0
+            && inSameEditingHost(endNode, endNode.parentNode)) {
+                endOffset = getNodeIndex(endNode);
+                endNode = endNode.parentNode;
+
+            // "Otherwise, if end node is a Text node and its parent's resolved
+            // value for "white-space" is neither "pre" nor "pre-wrap" and end
+            // offset is end node's length and the last code unit of end node's
+            // data is a space (0x0020) and end node precedes a line break:"
+            } else if (endNode.nodeType == Node.TEXT_NODE
+            && ["pre", "pre-wrap"].indexOf(getComputedStyle(endNode.parentNode).whiteSpace) == -1
+            && endOffset == getNodeLength(endNode)
+            && endNode.data[endNode.data.length - 1] == " "
+            && precedesLineBreak(endNode)) {
+                // "Subtract one from end offset."
+                endOffset--;
+
+                // "Subtract one from length."
+                length--;
+
+                // "Call deleteData(end offset, 1) on end node."
+                endNode.deleteData(endOffset, 1);
+
+            // "Otherwise, break from this loop."
+            } else {
+                break;
+            }
+        }
+    }
+
+    // "Let replacement whitespace be the canonical space sequence of length
+    // length. non-breaking start is true if start offset is zero and start
+    // node follows a line break, and false otherwise. non-breaking end is true
+    // if end offset is end node's length and end node precedes a line break,
+    // and false otherwise."
+    var replacementWhitespace = canonicalSpaceSequence(length,
+        startOffset == 0 && followsLineBreak(startNode),
+        endOffset == getNodeLength(endNode) && precedesLineBreak(endNode));
+
+    // "While (start node, start offset) is before (end node, end offset):"
+    while (getPosition(startNode, startOffset, endNode, endOffset) == "before") {
+        // "If start node has a child with index start offset, set start node
+        // to that child, then set start offset to zero."
+        if (startOffset < startNode.childNodes.length) {
+            startNode = startNode.childNodes[startOffset];
+            startOffset = 0;
+
+        // "Otherwise, if start node is not a Text node or if start offset is
+        // start node's length, set start offset to one plus start node's
+        // index, then set start node to its parent."
+        } else if (startNode.nodeType != Node.TEXT_NODE
+        || startOffset == getNodeLength(startNode)) {
+            startOffset = 1 + getNodeIndex(startNode);
+            startNode = startNode.parentNode;
+
+        // "Otherwise:"
+        } else {
+            // "Remove the first element from replacement whitespace, and let
+            // element be that element."
+            var element = replacementWhitespace[0];
+            replacementWhitespace = replacementWhitespace.slice(1);
+
+            // "If element is not the same as the start offsetth element of
+            // start node's data:"
+            if (element != startNode.data[startOffset]) {
+                // "Call insertData(start offset, element) on start node."
+                startNode.insertData(startOffset, element);
+
+                // "Call deleteData(start offset + 1, 1) on start node."
+                startNode.deleteData(startOffset + 1, 1);
+            }
+
+            // "Add one to start offset."
+            startOffset++;
+        }
+    }
+}
+
+
+//@}
+///// Indenting and outdenting /////
+//@{
+
+function indentNodes(nodeList) {
+    // "If node list is empty, do nothing and abort these steps."
+    if (!nodeList.length) {
+        return;
+    }
+
+    // "Let first node be the first member of node list."
+    var firstNode = nodeList[0];
+
+    // "If first node's parent is an ol or ul:"
+    if (isHtmlElement(firstNode.parentNode, ["OL", "UL"])) {
+        // "Let tag be the local name of the parent of first node."
+        var tag = firstNode.parentNode.tagName;
+
+        // "Wrap node list, with sibling criteria returning true for an HTML
+        // element with local name tag and false otherwise, and new parent
+        // instructions returning the result of calling createElement(tag) on
+        // the ownerDocument of first node."
+        wrap(nodeList,
+            function(node) { return isHtmlElement(node, tag) },
+            function() { return firstNode.ownerDocument.createElement(tag) });
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "Wrap node list, with sibling criteria returning true for a simple
+    // indentation element and false otherwise, and new parent instructions
+    // returning the result of calling createElement("blockquote") on the
+    // ownerDocument of first node. Let new parent be the result."
+    var newParent = wrap(nodeList,
+        function(node) { return isSimpleIndentationElement(node) },
+        function() { return firstNode.ownerDocument.createElement("blockquote") });
+
+    // "Fix disallowed ancestors of new parent."
+    fixDisallowedAncestors(newParent);
+}
+
+function outdentNode(node) {
+    // "If node is not editable, abort these steps."
+    if (!isEditable(node)) {
+        return;
+    }
+
+    // "If node is a simple indentation element, remove node, preserving its
+    // descendants.  Then abort these steps."
+    if (isSimpleIndentationElement(node)) {
+        removePreservingDescendants(node);
+        return;
+    }
+
+    // "If node is an indentation element:"
+    if (isIndentationElement(node)) {
+        // "Unset the dir attribute of node, if any."
+        node.removeAttribute("dir");
+
+        // "Unset the margin, padding, and border CSS properties of node."
+        node.style.margin = "";
+        node.style.padding = "";
+        node.style.border = "";
+        if (node.getAttribute("style") == ""
+        // Crazy WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=68551
+        || node.getAttribute("style") == "border-width: initial; border-color: initial; ") {
+            node.removeAttribute("style");
+        }
+
+        // "Set the tag name of node to "div"."
+        setTagName(node, "div");
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "Let current ancestor be node's parent."
+    var currentAncestor = node.parentNode;
+
+    // "Let ancestor list be a list of nodes, initially empty."
+    var ancestorList = [];
+
+    // "While current ancestor is an editable Element that is neither a simple
+    // indentation element nor an ol nor a ul, append current ancestor to
+    // ancestor list and then set current ancestor to its parent."
+    while (isEditable(currentAncestor)
+    && currentAncestor.nodeType == Node.ELEMENT_NODE
+    && !isSimpleIndentationElement(currentAncestor)
+    && !isHtmlElement(currentAncestor, ["ol", "ul"])) {
+        ancestorList.push(currentAncestor);
+        currentAncestor = currentAncestor.parentNode;
+    }
+
+    // "If current ancestor is not an editable simple indentation element:"
+    if (!isEditable(currentAncestor)
+    || !isSimpleIndentationElement(currentAncestor)) {
+        // "Let current ancestor be node's parent."
+        currentAncestor = node.parentNode;
+
+        // "Let ancestor list be the empty list."
+        ancestorList = [];
+
+        // "While current ancestor is an editable Element that is neither an
+        // indentation element nor an ol nor a ul, append current ancestor to
+        // ancestor list and then set current ancestor to its parent."
+        while (isEditable(currentAncestor)
+        && currentAncestor.nodeType == Node.ELEMENT_NODE
+        && !isIndentationElement(currentAncestor)
+        && !isHtmlElement(currentAncestor, ["ol", "ul"])) {
+            ancestorList.push(currentAncestor);
+            currentAncestor = currentAncestor.parentNode;
+        }
+    }
+
+    // "If node is an ol or ul and current ancestor is not an editable
+    // indentation element:"
+    if (isHtmlElement(node, ["OL", "UL"])
+    && (!isEditable(currentAncestor)
+    || !isIndentationElement(currentAncestor))) {
+        // "Unset the reversed, start, and type attributes of node, if any are
+        // set."
+        node.removeAttribute("reversed");
+        node.removeAttribute("start");
+        node.removeAttribute("type");
+
+        // "Let children be the children of node."
+        var children = [].slice.call(node.childNodes);
+
+        // "If node has attributes, and its parent is not an ol or ul, set the
+        // tag name of node to "div"."
+        if (node.attributes.length
+        && !isHtmlElement(node.parentNode, ["OL", "UL"])) {
+            setTagName(node, "div");
+
+        // "Otherwise:"
+        } else {
+            // "Record the values of node's children, and let values be the
+            // result."
+            var values = recordValues([].slice.call(node.childNodes));
+
+            // "Remove node, preserving its descendants."
+            removePreservingDescendants(node);
+
+            // "Restore the values from values."
+            restoreValues(values);
+        }
+
+        // "Fix disallowed ancestors of each member of children."
+        for (var i = 0; i < children.length; i++) {
+            fixDisallowedAncestors(children[i]);
+        }
+
+        // "Abort these steps."
+        return;
+    }
+
+    // "If current ancestor is not an editable indentation element, abort these
+    // steps."
+    if (!isEditable(currentAncestor)
+    || !isIndentationElement(currentAncestor)) {
+        return;
+    }
+
+    // "Append current ancestor to ancestor list."
+    ancestorList.push(currentAncestor);
+
+    // "Let original ancestor be current ancestor."
+    var originalAncestor = currentAncestor;
+
+    // "While ancestor list is not empty:"
+    while (ancestorList.length) {
+        // "Let current ancestor be the last member of ancestor list."
+        //
+        // "Remove the last member of ancestor list."
+        currentAncestor = ancestorList.pop();
+
+        // "Let target be the child of current ancestor that is equal to either
+        // node or the last member of ancestor list."
+        var target = node.parentNode == currentAncestor
+            ? node
+            : ancestorList[ancestorList.length - 1];
+
+        // "If target is an inline node that is not a br, and its nextSibling
+        // is a br, remove target's nextSibling from its parent."
+        if (isInlineNode(target)
+        && !isHtmlElement(target, "BR")
+        && isHtmlElement(target.nextSibling, "BR")) {
+            target.parentNode.removeChild(target.nextSibling);
+        }
+
+        // "Let preceding siblings be the preceding siblings of target, and let
+        // following siblings be the following siblings of target."
+        var precedingSiblings = [].slice.call(currentAncestor.childNodes, 0, getNodeIndex(target));
+        var followingSiblings = [].slice.call(currentAncestor.childNodes, 1 + getNodeIndex(target));
+
+        // "Indent preceding siblings."
+        indentNodes(precedingSiblings);
+
+        // "Indent following siblings."
+        indentNodes(followingSiblings);
+    }
+
+    // "Outdent original ancestor."
+    outdentNode(originalAncestor);
+}
+
+
+//@}
+///// Toggling lists /////
+//@{
+
+function toggleLists(tagName) {
+    // "Let mode be "disable" if the selection's list state is tag name, and
+    // "enable" otherwise."
+    var mode = getSelectionListState() == tagName ? "disable" : "enable";
+
+    var range = getActiveRange();
+    tagName = tagName.toUpperCase();
+
+    // "Let other tag name be "ol" if tag name is "ul", and "ul" if tag name is
+    // "ol"."
+    var otherTagName = tagName == "OL" ? "UL" : "OL";
+
+    // "Let items be a list of all lis that are ancestor containers of the
+    // range's start and/or end node."
+    //
+    // It's annoying to get this in tree order using functional stuff without
+    // doing getDescendants(document), which is slow, so I do it imperatively.
+    var items = [];
+    (function(){
+        for (
+            var ancestorContainer = range.endContainer;
+            ancestorContainer != range.commonAncestorContainer;
+            ancestorContainer = ancestorContainer.parentNode
+        ) {
+            if (isHtmlElement(ancestorContainer, "li")) {
+                items.unshift(ancestorContainer);
+            }
+        }
+        for (
+            var ancestorContainer = range.startContainer;
+            ancestorContainer;
+            ancestorContainer = ancestorContainer.parentNode
+        ) {
+            if (isHtmlElement(ancestorContainer, "li")) {
+                items.unshift(ancestorContainer);
+            }
+        }
+    })();
+
+    // "For each item in items, normalize sublists of item."
+    items.forEach(normalizeSublists);
+
+    // "Block-extend the range, and let new range be the result."
+    var newRange = blockExtend(range);
+
+    // "If mode is "enable", then let lists to convert consist of every
+    // editable HTML element with local name other tag name that is contained
+    // in new range, and for every list in lists to convert:"
+    if (mode == "enable") {
+        getAllContainedNodes(newRange, function(node) {
+            return isEditable(node)
+                && isHtmlElement(node, otherTagName);
+        }).forEach(function(list) {
+            // "If list's previousSibling or nextSibling is an editable HTML
+            // element with local name tag name:"
+            if ((isEditable(list.previousSibling) && isHtmlElement(list.previousSibling, tagName))
+            || (isEditable(list.nextSibling) && isHtmlElement(list.nextSibling, tagName))) {
+                // "Let children be list's children."
+                var children = [].slice.call(list.childNodes);
+
+                // "Record the values of children, and let values be the
+                // result."
+                var values = recordValues(children);
+
+                // "Split the parent of children."
+                splitParent(children);
+
+                // "Wrap children, with sibling criteria returning true for an
+                // HTML element with local name tag name and false otherwise."
+                wrap(children, function(node) { return isHtmlElement(node, tagName) });
+
+                // "Restore the values from values."
+                restoreValues(values);
+
+            // "Otherwise, set the tag name of list to tag name."
+            } else {
+                setTagName(list, tagName);
+            }
+        });
+    }
+
+    // "Let node list be a list of nodes, initially empty."
+    //
+    // "For each node node contained in new range, if node is editable; the
+    // last member of node list (if any) is not an ancestor of node; node
+    // is not an indentation element; and either node is an ol or ul, or its
+    // parent is an ol or ul, or it is an allowed child of "li"; then append
+    // node to node list."
+    var nodeList = getContainedNodes(newRange, function(node) {
+        return isEditable(node)
+        && !isIndentationElement(node)
+        && (isHtmlElement(node, ["OL", "UL"])
+        || isHtmlElement(node.parentNode, ["OL", "UL"])
+        || isAllowedChild(node, "li"));
+    });
+
+    // "If mode is "enable", remove from node list any ol or ul whose parent is
+    // not also an ol or ul."
+    if (mode == "enable") {
+        nodeList = nodeList.filter(function(node) {
+            return !isHtmlElement(node, ["ol", "ul"])
+                || isHtmlElement(node.parentNode, ["ol", "ul"]);
+        });
+    }
+
+    // "If mode is "disable", then while node list is not empty:"
+    if (mode == "disable") {
+        while (nodeList.length) {
+            // "Let sublist be an empty list of nodes."
+            var sublist = [];
+
+            // "Remove the first member from node list and append it to
+            // sublist."
+            sublist.push(nodeList.shift());
+
+            // "If the first member of sublist is an HTML element with local
+            // name tag name, outdent it and continue this loop from the
+            // beginning."
+            if (isHtmlElement(sublist[0], tagName)) {
+                outdentNode(sublist[0]);
+                continue;
+            }
+
+            // "While node list is not empty, and the first member of node list
+            // is the nextSibling of the last member of sublist and is not an
+            // HTML element with local name tag name, remove the first member
+            // from node list and append it to sublist."
+            while (nodeList.length
+            && nodeList[0] == sublist[sublist.length - 1].nextSibling
+            && !isHtmlElement(nodeList[0], tagName)) {
+                sublist.push(nodeList.shift());
+            }
+
+            // "Record the values of sublist, and let values be the result."
+            var values = recordValues(sublist);
+
+            // "Split the parent of sublist."
+            splitParent(sublist);
+
+            // "Fix disallowed ancestors of each member of sublist."
+            for (var i = 0; i < sublist.length; i++) {
+                fixDisallowedAncestors(sublist[i]);
+            }
+
+            // "Restore the values from values."
+            restoreValues(values);
+        }
+
+    // "Otherwise, while node list is not empty:"
+    } else {
+        while (nodeList.length) {
+            // "Let sublist be an empty list of nodes."
+            var sublist = [];
+
+            // "While either sublist is empty, or node list is not empty and
+            // its first member is the nextSibling of sublist's last member:"
+            while (!sublist.length
+            || (nodeList.length
+            && nodeList[0] == sublist[sublist.length - 1].nextSibling)) {
+                // "If node list's first member is a p or div, set the tag name
+                // of node list's first member to "li", and append the result
+                // to sublist. Remove the first member from node list."
+                if (isHtmlElement(nodeList[0], ["p", "div"])) {
+                    sublist.push(setTagName(nodeList[0], "li"));
+                    nodeList.shift();
+
+                // "Otherwise, if the first member of node list is an li or ol
+                // or ul, remove it from node list and append it to sublist."
+                } else if (isHtmlElement(nodeList[0], ["li", "ol", "ul"])) {
+                    sublist.push(nodeList.shift());
+
+                // "Otherwise:"
+                } else {
+                    // "Let nodes to wrap be a list of nodes, initially empty."
+                    var nodesToWrap = [];
+
+                    // "While nodes to wrap is empty, or node list is not empty
+                    // and its first member is the nextSibling of nodes to
+                    // wrap's last member and the first member of node list is
+                    // an inline node and the last member of nodes to wrap is
+                    // an inline node other than a br, remove the first member
+                    // from node list and append it to nodes to wrap."
+                    while (!nodesToWrap.length
+                    || (nodeList.length
+                    && nodeList[0] == nodesToWrap[nodesToWrap.length - 1].nextSibling
+                    && isInlineNode(nodeList[0])
+                    && isInlineNode(nodesToWrap[nodesToWrap.length - 1])
+                    && !isHtmlElement(nodesToWrap[nodesToWrap.length - 1], "br"))) {
+                        nodesToWrap.push(nodeList.shift());
+                    }
+
+                    // "Wrap nodes to wrap, with new parent instructions
+                    // returning the result of calling createElement("li") on
+                    // the context object. Append the result to sublist."
+                    sublist.push(wrap(nodesToWrap,
+                        undefined,
+                        function() { return document.createElement("li") }));
+                }
+            }
+
+            // "If sublist's first member's parent is an HTML element with
+            // local name tag name, or if every member of sublist is an ol or
+            // ul, continue this loop from the beginning."
+            if (isHtmlElement(sublist[0].parentNode, tagName)
+            || sublist.every(function(node) { return isHtmlElement(node, ["ol", "ul"]) })) {
+                continue;
+            }
+
+            // "If sublist's first member's parent is an HTML element with
+            // local name other tag name:"
+            if (isHtmlElement(sublist[0].parentNode, otherTagName)) {
+                // "Record the values of sublist, and let values be the
+                // result."
+                var values = recordValues(sublist);
+
+                // "Split the parent of sublist."
+                splitParent(sublist);
+
+                // "Wrap sublist, with sibling criteria returning true for an
+                // HTML element with local name tag name and false otherwise,
+                // and new parent instructions returning the result of calling
+                // createElement(tag name) on the context object."
+                wrap(sublist,
+                    function(node) { return isHtmlElement(node, tagName) },
+                    function() { return document.createElement(tagName) });
+
+                // "Restore the values from values."
+                restoreValues(values);
+
+                // "Continue this loop from the beginning."
+                continue;
+            }
+
+            // "Wrap sublist, with sibling criteria returning true for an HTML
+            // element with local name tag name and false otherwise, and new
+            // parent instructions being the following:"
+            // . . .
+            // "Fix disallowed ancestors of the previous step's result."
+            fixDisallowedAncestors(wrap(sublist,
+                function(node) { return isHtmlElement(node, tagName) },
+                function() {
+                    // "If sublist's first member's parent is not an editable
+                    // simple indentation element, or sublist's first member's
+                    // parent's previousSibling is not an editable HTML element
+                    // with local name tag name, call createElement(tag name)
+                    // on the context object and return the result."
+                    if (!isEditable(sublist[0].parentNode)
+                    || !isSimpleIndentationElement(sublist[0].parentNode)
+                    || !isEditable(sublist[0].parentNode.previousSibling)
+                    || !isHtmlElement(sublist[0].parentNode.previousSibling, tagName)) {
+                        return document.createElement(tagName);
+                    }
+
+                    // "Let list be sublist's first member's parent's
+                    // previousSibling."
+                    var list = sublist[0].parentNode.previousSibling;
+
+                    // "Normalize sublists of list's lastChild."
+                    normalizeSublists(list.lastChild);
+
+                    // "If list's lastChild is not an editable HTML element
+                    // with local name tag name, call createElement(tag name)
+                    // on the context object, and append the result as the last
+                    // child of list."
+                    if (!isEditable(list.lastChild)
+                    || !isHtmlElement(list.lastChild, tagName)) {
+                        list.appendChild(document.createElement(tagName));
+                    }
+
+                    // "Return the last child of list."
+                    return list.lastChild;
+                }
+            ));
+        }
+    }
+}
+
+
+//@}
+///// Justifying the selection /////
+//@{
+
+function justifySelection(alignment) {
+    // "Block-extend the active range, and let new range be the result."
+    var newRange = blockExtend(globalRange);
+
+    // "Let element list be a list of all editable Elements contained in new
+    // range that either has an attribute in the HTML namespace whose local
+    // name is "align", or has a style attribute that sets "text-align", or is
+    // a center."
+    var elementList = getAllContainedNodes(newRange, function(node) {
+        return node.nodeType == Node.ELEMENT_NODE
+            && isEditable(node)
+            // Ignoring namespaces here
+            && (
+                node.hasAttribute("align")
+                || node.style.textAlign != ""
+                || isHtmlElement(node, "center")
+            );
+    });
+
+    // "For each element in element list:"
+    for (var i = 0; i < elementList.length; i++) {
+        var element = elementList[i];
+
+        // "If element has an attribute in the HTML namespace whose local name
+        // is "align", remove that attribute."
+        element.removeAttribute("align");
+
+        // "Unset the CSS property "text-align" on element, if it's set by a
+        // style attribute."
+        element.style.textAlign = "";
+        if (element.getAttribute("style") == "") {
+            element.removeAttribute("style");
+        }
+
+        // "If element is a div or span or center with no attributes, remove
+        // it, preserving its descendants."
+        if (isHtmlElement(element, ["div", "span", "center"])
+        && !element.attributes.length) {
+            removePreservingDescendants(element);
+        }
+
+        // "If element is a center with one or more attributes, set the tag
+        // name of element to "div"."
+        if (isHtmlElement(element, "center")
+        && element.attributes.length) {
+            setTagName(element, "div");
+        }
+    }
+
+    // "Block-extend the active range, and let new range be the result."
+    newRange = blockExtend(globalRange);
+
+    // "Let node list be a list of nodes, initially empty."
+    var nodeList = [];
+
+    // "For each node node contained in new range, append node to node list if
+    // the last member of node list (if any) is not an ancestor of node; node
+    // is editable; node is an allowed child of "div"; and node's alignment
+    // value is not alignment."
+    nodeList = getContainedNodes(newRange, function(node) {
+        return isEditable(node)
+            && isAllowedChild(node, "div")
+            && getAlignmentValue(node) != alignment;
+    });
+
+    // "While node list is not empty:"
+    while (nodeList.length) {
+        // "Let sublist be a list of nodes, initially empty."
+        var sublist = [];
+
+        // "Remove the first member of node list and append it to sublist."
+        sublist.push(nodeList.shift());
+
+        // "While node list is not empty, and the first member of node list is
+        // the nextSibling of the last member of sublist, remove the first
+        // member of node list and append it to sublist."
+        while (nodeList.length
+        && nodeList[0] == sublist[sublist.length - 1].nextSibling) {
+            sublist.push(nodeList.shift());
+        }
+
+        // "Wrap sublist. Sibling criteria returns true for any div that has
+        // one or both of the following two attributes and no other attributes,
+        // and false otherwise:"
+        //
+        //   * "An align attribute whose value is an ASCII case-insensitive
+        //     match for alignment.
+        //   * "A style attribute which sets exactly one CSS property
+        //     (including unrecognized or invalid attributes), which is
+        //     "text-align", which is set to alignment.
+        //
+        // "New parent instructions are to call createElement("div") on the
+        // context object, then set its CSS property "text-align" to alignment
+        // and return the result."
+        wrap(sublist,
+            function(node) {
+                return isHtmlElement(node, "div")
+                    && [].every.call(node.attributes, function(attr) {
+                        return (attr.name == "align" && attr.value.toLowerCase() == alignment)
+                            || (attr.name == "style" && node.style.length == 1 && node.style.textAlign == alignment);
+                    });
+            },
+            function() {
+                var newParent = document.createElement("div");
+                newParent.setAttribute("style", "text-align: " + alignment);
+                return newParent;
+            }
+        );
+    }
+}
+
+
+//@}
+///// Automatic linking /////
+//@{
+// "An autolinkable URL is a string of the following form:"
+var autolinkableUrlRegexp =
+    // "Either a string matching the scheme pattern from RFC 3986 section 3.1
+    // followed by the literal string ://, or the literal string mailto:;
+    // followed by"
+    //
+    // From the RFC: scheme      = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
+    "([a-zA-Z][a-zA-Z0-9+.-]*://|mailto:)"
+    // "Zero or more characters other than space characters; followed by"
+    + "[^ \t\n\f\r]*"
+    // "A character that is not one of the ASCII characters !"'(),-.:;<>[]`{}."
+    + "[^!\"'(),\\-.:;<>[\\]`{}]";
+
+// "A valid e-mail address is a string that matches the ABNF production 1*(
+// atext / "." ) "@" ldh-str *( "." ldh-str ) where atext is defined in RFC
+// 5322 section 3.2.3, and ldh-str is defined in RFC 1034 section 3.5."
+//
+// atext: ALPHA / DIGIT / "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" /
+// "/" / "=" / "?" / "^" / "_" / "`" / "{" / "|" / "}" / "~"
+//
+//<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
+//<let-dig-hyp> ::= <let-dig> | "-"
+//<let-dig> ::= <letter> | <digit>
+var validEmailRegexp =
+    "[a-zA-Z0-9!#$%&'*+\\-/=?^_`{|}~.]+@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*";
+
+function autolink(node, endOffset) {
+    // "While (node, end offset)'s previous equivalent point is not null, set
+    // it to its previous equivalent point."
+    while (getPreviousEquivalentPoint(node, endOffset)) {
+        var prev = getPreviousEquivalentPoint(node, endOffset);
+        node = prev[0];
+        endOffset = prev[1];
+    }
+
+    // "If node is not a Text node, or has an a ancestor, do nothing and abort
+    // these steps."
+    if (node.nodeType != Node.TEXT_NODE
+    || getAncestors(node).some(function(ancestor) { return isHtmlElement(ancestor, "a") })) {
+        return;
+    }
+
+    // "Let search be the largest substring of node's data whose end is end
+    // offset and that contains no space characters."
+    var search = /[^ \t\n\f\r]*$/.exec(node.substringData(0, endOffset))[0];
+
+    // "If some substring of search is an autolinkable URL:"
+    if (new RegExp(autolinkableUrlRegexp).test(search)) {
+        // "While there is no substring of node's data ending at end offset
+        // that is an autolinkable URL, decrement end offset."
+        while (!(new RegExp(autolinkableUrlRegexp + "$").test(node.substringData(0, endOffset)))) {
+            endOffset--;
+        }
+
+        // "Let start offset be the start index of the longest substring of
+        // node's data that is an autolinkable URL ending at end offset."
+        var startOffset = new RegExp(autolinkableUrlRegexp + "$").exec(node.substringData(0, endOffset)).index;
+
+        // "Let href be the substring of node's data starting at start offset
+        // and ending at end offset."
+        var href = node.substringData(startOffset, endOffset - startOffset);
+
+    // "Otherwise, if some substring of search is a valid e-mail address:"
+    } else if (new RegExp(validEmailRegexp).test(search)) {
+        // "While there is no substring of node's data ending at end offset
+        // that is a valid e-mail address, decrement end offset."
+        while (!(new RegExp(validEmailRegexp + "$").test(node.substringData(0, endOffset)))) {
+            endOffset--;
+        }
+
+        // "Let start offset be the start index of the longest substring of
+        // node's data that is a valid e-mail address ending at end offset."
+        var startOffset = new RegExp(validEmailRegexp + "$").exec(node.substringData(0, endOffset)).index;
+
+        // "Let href be "mailto:" concatenated with the substring of node's
+        // data starting at start offset and ending at end offset."
+        var href = "mailto:" + node.substringData(startOffset, endOffset - startOffset);
+
+    // "Otherwise, do nothing and abort these steps."
+    } else {
+        return;
+    }
+
+    // "Let original range be the active range."
+    var originalRange = getActiveRange();
+
+    // "Create a new range with start (node, start offset) and end (node, end
+    // offset), and set the context object's selection's range to it."
+    var newRange = document.createRange();
+    newRange.setStart(node, startOffset);
+    newRange.setEnd(node, endOffset);
+    getSelection().removeAllRanges();
+    getSelection().addRange(newRange);
+    globalRange = newRange;
+
+    // "Take the action for "createLink", with value equal to href."
+    commands.createlink.action(href);
+
+    // "Set the context object's selection's range to original range."
+    getSelection().removeAllRanges();
+    getSelection().addRange(originalRange);
+    globalRange = originalRange;
+}
+//@}
+///// The delete command /////
+//@{
+commands["delete"] = {
+    preservesOverrides: true,
+    action: function() {
+        // "If the active range is not collapsed, delete the selection and
+        // return true."
+        if (!getActiveRange().collapsed) {
+            deleteSelection();
+            return true;
+        }
+
+        // "Canonicalize whitespace at the active range's start."
+        canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);
+
+        // "Let node and offset be the active range's start node and offset."
+        var node = getActiveRange().startContainer;
+        var offset = getActiveRange().startOffset;
+
+        // "Repeat the following steps:"
+        while (true) {
+            // "If offset is zero and node's previousSibling is an editable
+            // invisible node, remove node's previousSibling from its parent."
+            if (offset == 0
+            && isEditable(node.previousSibling)
+            && isInvisible(node.previousSibling)) {
+                node.parentNode.removeChild(node.previousSibling);
+
+            // "Otherwise, if node has a child with index offset − 1 and that
+            // child is an editable invisible node, remove that child from
+            // node, then subtract one from offset."
+            } else if (0 <= offset - 1
+            && offset - 1 < node.childNodes.length
+            && isEditable(node.childNodes[offset - 1])
+            && isInvisible(node.childNodes[offset - 1])) {
+                node.removeChild(node.childNodes[offset - 1]);
+                offset--;
+
+            // "Otherwise, if offset is zero and node is an inline node, or if
+            // node is an invisible node, set offset to the index of node, then
+            // set node to its parent."
+            } else if ((offset == 0
+            && isInlineNode(node))
+            || isInvisible(node)) {
+                offset = getNodeIndex(node);
+                node = node.parentNode;
+
+            // "Otherwise, if node has a child with index offset − 1 and that
+            // child is an editable a, remove that child from node, preserving
+            // its descendants. Then return true."
+            } else if (0 <= offset - 1
+            && offset - 1 < node.childNodes.length
+            && isEditable(node.childNodes[offset - 1])
+            && isHtmlElement(node.childNodes[offset - 1], "a")) {
+                removePreservingDescendants(node.childNodes[offset - 1]);
+                return true;
+
+            // "Otherwise, if node has a child with index offset − 1 and that
+            // child is not a block node or a br or an img, set node to that
+            // child, then set offset to the length of node."
+            } else if (0 <= offset - 1
+            && offset - 1 < node.childNodes.length
+            && !isBlockNode(node.childNodes[offset - 1])
+            && !isHtmlElement(node.childNodes[offset - 1], ["br", "img"])) {
+                node = node.childNodes[offset - 1];
+                offset = getNodeLength(node);
+
+            // "Otherwise, break from this loop."
+            } else {
+                break;
+            }
+        }
+
+        // "If node is a Text node and offset is not zero, or if node is a
+        // block node that has a child with index offset − 1 and that child is
+        // a br or hr or img:"
+        if ((node.nodeType == Node.TEXT_NODE
+        && offset != 0)
+        || (isBlockNode(node)
+        && 0 <= offset - 1
+        && offset - 1 < node.childNodes.length
+        && isHtmlElement(node.childNodes[offset - 1], ["br", "hr", "img"]))) {
+            // "Call collapse(node, offset) on the context object's Selection."
+            getSelection().collapse(node, offset);
+            getActiveRange().setEnd(node, offset);
+
+            // "Call extend(node, offset − 1) on the context object's
+            // Selection."
+            getSelection().extend(node, offset - 1);
+            getActiveRange().setStart(node, offset - 1);
+
+            // "Delete the selection."
+            deleteSelection();
+
+            // "Return true."
+            return true;
+        }
+
+        // "If node is an inline node, return true."
+        if (isInlineNode(node)) {
+            return true;
+        }
+
+        // "If node is an li or dt or dd and is the first child of its parent,
+        // and offset is zero:"
+        if (isHtmlElement(node, ["li", "dt", "dd"])
+        && node == node.parentNode.firstChild
+        && offset == 0) {
+            // "Let items be a list of all lis that are ancestors of node."
+            //
+            // Remember, must be in tree order.
+            var items = [];
+            for (var ancestor = node.parentNode; ancestor; ancestor = ancestor.parentNode) {
+                if (isHtmlElement(ancestor, "li")) {
+                    items.unshift(ancestor);
+                }
+            }
+
+            // "Normalize sublists of each item in items."
+            for (var i = 0; i < items.length; i++) {
+                normalizeSublists(items[i]);
+            }
+
+            // "Record the values of the one-node list consisting of node, and
+            // let values be the result."
+            var values = recordValues([node]);
+
+            // "Split the parent of the one-node list consisting of node."
+            splitParent([node]);
+
+            // "Restore the values from values."
+            restoreValues(values);
+
+            // "If node is a dd or dt, and it is not an allowed child of any of
+            // its ancestors in the same editing host, set the tag name of node
+            // to the default single-line container name and let node be the
+            // result."
+            if (isHtmlElement(node, ["dd", "dt"])
+            && getAncestors(node).every(function(ancestor) {
+                return !inSameEditingHost(node, ancestor)
+                    || !isAllowedChild(node, ancestor)
+            })) {
+                node = setTagName(node, defaultSingleLineContainerName);
+            }
+
+            // "Fix disallowed ancestors of node."
+            fixDisallowedAncestors(node);
+
+            // "Return true."
+            return true;
+        }
+
+        // "Let start node equal node and let start offset equal offset."
+        var startNode = node;
+        var startOffset = offset;
+
+        // "Repeat the following steps:"
+        while (true) {
+            // "If start offset is zero, set start offset to the index of start
+            // node and then set start node to its parent."
+            if (startOffset == 0) {
+                startOffset = getNodeIndex(startNode);
+                startNode = startNode.parentNode;
+
+            // "Otherwise, if start node has an editable invisible child with
+            // index start offset minus one, remove it from start node and
+            // subtract one from start offset."
+            } else if (0 <= startOffset - 1
+            && startOffset - 1 < startNode.childNodes.length
+            && isEditable(startNode.childNodes[startOffset - 1])
+            && isInvisible(startNode.childNodes[startOffset - 1])) {
+                startNode.removeChild(startNode.childNodes[startOffset - 1]);
+                startOffset--;
+
+            // "Otherwise, break from this loop."
+            } else {
+                break;
+            }
+        }
+
+        // "If offset is zero, and node has an editable ancestor container in
+        // the same editing host that's an indentation element:"
+        if (offset == 0
+        && getAncestors(node).concat(node).filter(function(ancestor) {
+            return isEditable(ancestor)
+                && inSameEditingHost(ancestor, node)
+                && isIndentationElement(ancestor);
+        }).length) {
+            // "Block-extend the range whose start and end are both (node, 0),
+            // and let new range be the result."
+            var newRange = document.createRange();
+            newRange.setStart(node, 0);
+            newRange = blockExtend(newRange);
+
+            // "Let node list be a list of nodes, initially empty."
+            //
+            // "For each node current node contained in new range, append
+            // current node to node list if the last member of node list (if
+            // any) is not an ancestor of current node, and current node is
+            // editable but has no editable descendants."
+            var nodeList = getContainedNodes(newRange, function(currentNode) {
+                return isEditable(currentNode)
+                    && !hasEditableDescendants(currentNode);
+            });
+
+            // "Outdent each node in node list."
+            for (var i = 0; i < nodeList.length; i++) {
+                outdentNode(nodeList[i]);
+            }
+
+            // "Return true."
+            return true;
+        }
+
+        // "If the child of start node with index start offset is a table,
+        // return true."
+        if (isHtmlElement(startNode.childNodes[startOffset], "table")) {
+            return true;
+        }
+
+        // "If start node has a child with index start offset − 1, and that
+        // child is a table:"
+        if (0 <= startOffset - 1
+        && startOffset - 1 < startNode.childNodes.length
+        && isHtmlElement(startNode.childNodes[startOffset - 1], "table")) {
+            // "Call collapse(start node, start offset − 1) on the context
+            // object's Selection."
+            getSelection().collapse(startNode, startOffset - 1);
+            getActiveRange().setStart(startNode, startOffset - 1);
+
+            // "Call extend(start node, start offset) on the context object's
+            // Selection."
+            getSelection().extend(startNode, startOffset);
+            getActiveRange().setEnd(startNode, startOffset);
+
+            // "Return true."
+            return true;
+        }
+
+        // "If offset is zero; and either the child of start node with index
+        // start offset minus one is an hr, or the child is a br whose
+        // previousSibling is either a br or not an inline node:"
+        if (offset == 0
+        && (isHtmlElement(startNode.childNodes[startOffset - 1], "hr")
+            || (
+                isHtmlElement(startNode.childNodes[startOffset - 1], "br")
+                && (
+                    isHtmlElement(startNode.childNodes[startOffset - 1].previousSibling, "br")
+                    || !isInlineNode(startNode.childNodes[startOffset - 1].previousSibling)
+                )
+            )
+        )) {
+            // "Call collapse(start node, start offset − 1) on the context
+            // object's Selection."
+            getSelection().collapse(startNode, startOffset - 1);
+            getActiveRange().setStart(startNode, startOffset - 1);
+
+            // "Call extend(start node, start offset) on the context object's
+            // Selection."
+            getSelection().extend(startNode, startOffset);
+            getActiveRange().setEnd(startNode, startOffset);
+
+            // "Delete the selection."
+            deleteSelection();
+
+            // "Call collapse(node, offset) on the Selection."
+            getSelection().collapse(node, offset);
+            getActiveRange().setStart(node, offset);
+            getActiveRange().collapse(true);
+
+            // "Return true."
+            return true;
+        }
+
+        // "If the child of start node with index start offset is an li or dt
+        // or dd, and that child's firstChild is an inline node, and start
+        // offset is not zero:"
+        if (isHtmlElement(startNode.childNodes[startOffset], ["li", "dt", "dd"])
+        && isInlineNode(startNode.childNodes[startOffset].firstChild)
+        && startOffset != 0) {
+            // "Let previous item be the child of start node with index start
+            // offset minus one."
+            var previousItem = startNode.childNodes[startOffset - 1];
+
+            // "If previous item's lastChild is an inline node other than a br,
+            // call createElement("br") on the context object and append the
+            // result as the last child of previous item."
+            if (isInlineNode(previousItem.lastChild)
+            && !isHtmlElement(previousItem.lastChild, "br")) {
+                previousItem.appendChild(document.createElement("br"));
+            }
+
+            // "If previous item's lastChild is an inline node, call
+            // createElement("br") on the context object and append the result
+            // as the last child of previous item."
+            if (isInlineNode(previousItem.lastChild)) {
+                previousItem.appendChild(document.createElement("br"));
+            }
+        }
+
+        // "If start node's child with index start offset is an li or dt or dd,
+        // and that child's previousSibling is also an li or dt or dd:"
+        if (isHtmlElement(startNode.childNodes[startOffset], ["li", "dt", "dd"])
+        && isHtmlElement(startNode.childNodes[startOffset].previousSibling, ["li", "dt", "dd"])) {
+            // "Call cloneRange() on the active range, and let original range
+            // be the result."
+            //
+            // We need to add it to extraRanges so it will actually get updated
+            // when moving preserving ranges.
+            var originalRange = getActiveRange().cloneRange();
+            extraRanges.push(originalRange);
+
+            // "Set start node to its child with index start offset − 1."
+            startNode = startNode.childNodes[startOffset - 1];
+
+            // "Set start offset to start node's length."
+            startOffset = getNodeLength(startNode);
+
+            // "Set node to start node's nextSibling."
+            node = startNode.nextSibling;
+
+            // "Call collapse(start node, start offset) on the context object's
+            // Selection."
+            getSelection().collapse(startNode, startOffset);
+            getActiveRange().setStart(startNode, startOffset);
+
+            // "Call extend(node, 0) on the context object's Selection."
+            getSelection().extend(node, 0);
+            getActiveRange().setEnd(node, 0);
+
+            // "Delete the selection."
+            deleteSelection();
+
+            // "Call removeAllRanges() on the context object's Selection."
+            getSelection().removeAllRanges();
+
+            // "Call addRange(original range) on the context object's
+            // Selection."
+            getSelection().addRange(originalRange);
+            getActiveRange().setStart(originalRange.startContainer, originalRange.startOffset);
+            getActiveRange().setEnd(originalRange.endContainer, originalRange.endOffset);
+
+            // "Return true."
+            extraRanges.pop();
+            return true;
+        }
+
+        // "While start node has a child with index start offset minus one:"
+        while (0 <= startOffset - 1
+        && startOffset - 1 < startNode.childNodes.length) {
+            // "If start node's child with index start offset minus one is
+            // editable and invisible, remove it from start node, then subtract
+            // one from start offset."
+            if (isEditable(startNode.childNodes[startOffset - 1])
+            && isInvisible(startNode.childNodes[startOffset - 1])) {
+                startNode.removeChild(startNode.childNodes[startOffset - 1]);
+                startOffset--;
+
+            // "Otherwise, set start node to its child with index start offset
+            // minus one, then set start offset to the length of start node."
+            } else {
+                startNode = startNode.childNodes[startOffset - 1];
+                startOffset = getNodeLength(startNode);
+            }
+        }
+
+        // "Call collapse(start node, start offset) on the context object's
+        // Selection."
+        getSelection().collapse(startNode, startOffset);
+        getActiveRange().setStart(startNode, startOffset);
+
+        // "Call extend(node, offset) on the context object's Selection."
+        getSelection().extend(node, offset);
+        getActiveRange().setEnd(node, offset);
+
+        // "Delete the selection, with direction "backward"."
+        deleteSelection({direction: "backward"});
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The formatBlock command /////
+//@{
+// "A formattable block name is "address", "dd", "div", "dt", "h1", "h2", "h3",
+// "h4", "h5", "h6", "p", or "pre"."
+var formattableBlockNames = ["address", "dd", "div", "dt", "h1", "h2", "h3",
+    "h4", "h5", "h6", "p", "pre"];
+
+commands.formatblock = {
+    preservesOverrides: true,
+    action: function(value) {
+        // "If value begins with a "<" character and ends with a ">" character,
+        // remove the first and last characters from it."
+        if (/^<.*>$/.test(value)) {
+            value = value.slice(1, -1);
+        }
+
+        // "Let value be converted to ASCII lowercase."
+        value = value.toLowerCase();
+
+        // "If value is not a formattable block name, return false."
+        if (formattableBlockNames.indexOf(value) == -1) {
+            return false;
+        }
+
+        // "Block-extend the active range, and let new range be the result."
+        var newRange = blockExtend(getActiveRange());
+
+        // "Let node list be an empty list of nodes."
+        //
+        // "For each node node contained in new range, append node to node list
+        // if it is editable, the last member of original node list (if any) is
+        // not an ancestor of node, node is either a non-list single-line
+        // container or an allowed child of "p" or a dd or dt, and node is not
+        // the ancestor of a prohibited paragraph child."
+        var nodeList = getContainedNodes(newRange, function(node) {
+            return isEditable(node)
+                && (isNonListSingleLineContainer(node)
+                || isAllowedChild(node, "p")
+                || isHtmlElement(node, ["dd", "dt"]))
+                && !getDescendants(node).some(isProhibitedParagraphChild);
+        });
+
+        // "Record the values of node list, and let values be the result."
+        var values = recordValues(nodeList);
+
+        // "For each node in node list, while node is the descendant of an
+        // editable HTML element in the same editing host, whose local name is
+        // a formattable block name, and which is not the ancestor of a
+        // prohibited paragraph child, split the parent of the one-node list
+        // consisting of node."
+        for (var i = 0; i < nodeList.length; i++) {
+            var node = nodeList[i];
+            while (getAncestors(node).some(function(ancestor) {
+                return isEditable(ancestor)
+                    && inSameEditingHost(ancestor, node)
+                    && isHtmlElement(ancestor, formattableBlockNames)
+                    && !getDescendants(ancestor).some(isProhibitedParagraphChild);
+            })) {
+                splitParent([node]);
+            }
+        }
+
+        // "Restore the values from values."
+        restoreValues(values);
+
+        // "While node list is not empty:"
+        while (nodeList.length) {
+            var sublist;
+
+            // "If the first member of node list is a single-line
+            // container:"
+            if (isSingleLineContainer(nodeList[0])) {
+                // "Let sublist be the children of the first member of node
+                // list."
+                sublist = [].slice.call(nodeList[0].childNodes);
+
+                // "Record the values of sublist, and let values be the
+                // result."
+                var values = recordValues(sublist);
+
+                // "Remove the first member of node list from its parent,
+                // preserving its descendants."
+                removePreservingDescendants(nodeList[0]);
+
+                // "Restore the values from values."
+                restoreValues(values);
+
+                // "Remove the first member from node list."
+                nodeList.shift();
+
+            // "Otherwise:"
+            } else {
+                // "Let sublist be an empty list of nodes."
+                sublist = [];
+
+                // "Remove the first member of node list and append it to
+                // sublist."
+                sublist.push(nodeList.shift());
+
+                // "While node list is not empty, and the first member of
+                // node list is the nextSibling of the last member of
+                // sublist, and the first member of node list is not a
+                // single-line container, and the last member of sublist is
+                // not a br, remove the first member of node list and
+                // append it to sublist."
+                while (nodeList.length
+                && nodeList[0] == sublist[sublist.length - 1].nextSibling
+                && !isSingleLineContainer(nodeList[0])
+                && !isHtmlElement(sublist[sublist.length - 1], "BR")) {
+                    sublist.push(nodeList.shift());
+                }
+            }
+
+            // "Wrap sublist. If value is "div" or "p", sibling criteria
+            // returns false; otherwise it returns true for an HTML element
+            // with local name value and no attributes, and false otherwise.
+            // New parent instructions return the result of running
+            // createElement(value) on the context object. Then fix disallowed
+            // ancestors of the result."
+            fixDisallowedAncestors(wrap(sublist,
+                ["div", "p"].indexOf(value) == - 1
+                    ? function(node) { return isHtmlElement(node, value) && !node.attributes.length }
+                    : function() { return false },
+                function() { return document.createElement(value) }));
+        }
+
+        // "Return true."
+        return true;
+    }, indeterm: function() {
+        // "If the active range is null, return false."
+        if (!getActiveRange()) {
+            return false;
+        }
+
+        // "Block-extend the active range, and let new range be the result."
+        var newRange = blockExtend(getActiveRange());
+
+        // "Let node list be all visible editable nodes that are contained in
+        // new range and have no children."
+        var nodeList = getAllContainedNodes(newRange, function(node) {
+            return isVisible(node)
+                && isEditable(node)
+                && !node.hasChildNodes();
+        });
+
+        // "If node list is empty, return false."
+        if (!nodeList.length) {
+            return false;
+        }
+
+        // "Let type be null."
+        var type = null;
+
+        // "For each node in node list:"
+        for (var i = 0; i < nodeList.length; i++) {
+            var node = nodeList[i];
+
+            // "While node's parent is editable and in the same editing host as
+            // node, and node is not an HTML element whose local name is a
+            // formattable block name, set node to its parent."
+            while (isEditable(node.parentNode)
+            && inSameEditingHost(node, node.parentNode)
+            && !isHtmlElement(node, formattableBlockNames)) {
+                node = node.parentNode;
+            }
+
+            // "Let current type be the empty string."
+            var currentType = "";
+
+            // "If node is an editable HTML element whose local name is a
+            // formattable block name, and node is not the ancestor of a
+            // prohibited paragraph child, set current type to node's local
+            // name."
+            if (isEditable(node)
+            && isHtmlElement(node, formattableBlockNames)
+            && !getDescendants(node).some(isProhibitedParagraphChild)) {
+                currentType = node.tagName;
+            }
+
+            // "If type is null, set type to current type."
+            if (type === null) {
+                type = currentType;
+
+            // "Otherwise, if type does not equal current type, return true."
+            } else if (type != currentType) {
+                return true;
+            }
+        }
+
+        // "Return false."
+        return false;
+    }, value: function() {
+        // "If the active range is null, return the empty string."
+        if (!getActiveRange()) {
+            return "";
+        }
+
+        // "Block-extend the active range, and let new range be the result."
+        var newRange = blockExtend(getActiveRange());
+
+        // "Let node be the first visible editable node that is contained in
+        // new range and has no children. If there is no such node, return the
+        // empty string."
+        var nodes = getAllContainedNodes(newRange, function(node) {
+            return isVisible(node)
+                && isEditable(node)
+                && !node.hasChildNodes();
+        });
+        if (!nodes.length) {
+            return "";
+        }
+        var node = nodes[0];
+
+        // "While node's parent is editable and in the same editing host as
+        // node, and node is not an HTML element whose local name is a
+        // formattable block name, set node to its parent."
+        while (isEditable(node.parentNode)
+        && inSameEditingHost(node, node.parentNode)
+        && !isHtmlElement(node, formattableBlockNames)) {
+            node = node.parentNode;
+        }
+
+        // "If node is an editable HTML element whose local name is a
+        // formattable block name, and node is not the ancestor of a prohibited
+        // paragraph child, return node's local name, converted to ASCII
+        // lowercase."
+        if (isEditable(node)
+        && isHtmlElement(node, formattableBlockNames)
+        && !getDescendants(node).some(isProhibitedParagraphChild)) {
+            return node.tagName.toLowerCase();
+        }
+
+        // "Return the empty string."
+        return "";
+    }
+};
+
+//@}
+///// The forwardDelete command /////
+//@{
+commands.forwarddelete = {
+    preservesOverrides: true,
+    action: function() {
+        // "If the active range is not collapsed, delete the selection and
+        // return true."
+        if (!getActiveRange().collapsed) {
+            deleteSelection();
+            return true;
+        }
+
+        // "Canonicalize whitespace at the active range's start."
+        canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);
+
+        // "Let node and offset be the active range's start node and offset."
+        var node = getActiveRange().startContainer;
+        var offset = getActiveRange().startOffset;
+
+        // "Repeat the following steps:"
+        while (true) {
+            // "If offset is the length of node and node's nextSibling is an
+            // editable invisible node, remove node's nextSibling from its
+            // parent."
+            if (offset == getNodeLength(node)
+            && isEditable(node.nextSibling)
+            && isInvisible(node.nextSibling)) {
+                node.parentNode.removeChild(node.nextSibling);
+
+            // "Otherwise, if node has a child with index offset and that child
+            // is an editable invisible node, remove that child from node."
+            } else if (offset < node.childNodes.length
+            && isEditable(node.childNodes[offset])
+            && isInvisible(node.childNodes[offset])) {
+                node.removeChild(node.childNodes[offset]);
+
+            // "Otherwise, if offset is the length of node and node is an
+            // inline node, or if node is invisible, set offset to one plus the
+            // index of node, then set node to its parent."
+            } else if ((offset == getNodeLength(node)
+            && isInlineNode(node))
+            || isInvisible(node)) {
+                offset = 1 + getNodeIndex(node);
+                node = node.parentNode;
+
+            // "Otherwise, if node has a child with index offset and that child
+            // is neither a block node nor a br nor an img nor a collapsed
+            // block prop, set node to that child, then set offset to zero."
+            } else if (offset < node.childNodes.length
+            && !isBlockNode(node.childNodes[offset])
+            && !isHtmlElement(node.childNodes[offset], ["br", "img"])
+            && !isCollapsedBlockProp(node.childNodes[offset])) {
+                node = node.childNodes[offset];
+                offset = 0;
+
+            // "Otherwise, break from this loop."
+            } else {
+                break;
+            }
+        }
+
+        // "If node is a Text node and offset is not node's length:"
+        if (node.nodeType == Node.TEXT_NODE
+        && offset != getNodeLength(node)) {
+            // "Let end offset be offset plus one."
+            var endOffset = offset + 1;
+
+            // "While end offset is not node's length and the end offsetth
+            // element of node's data has general category M when interpreted
+            // as a Unicode code point, add one to end offset."
+            //
+            // TODO: Not even going to try handling anything beyond the most
+            // basic combining marks, since I couldn't find a good list.  I
+            // special-case a few Hebrew diacritics too to test basic coverage
+            // of non-Latin stuff.
+            while (endOffset != node.length
+            && /^[\u0300-\u036f\u0591-\u05bd\u05c1\u05c2]$/.test(node.data[endOffset])) {
+                endOffset++;
+            }
+
+            // "Call collapse(node, offset) on the context object's Selection."
+            getSelection().collapse(node, offset);
+            getActiveRange().setStart(node, offset);
+
+            // "Call extend(node, end offset) on the context object's
+            // Selection."
+            getSelection().extend(node, endOffset);
+            getActiveRange().setEnd(node, endOffset);
+
+            // "Delete the selection."
+            deleteSelection();
+
+            // "Return true."
+            return true;
+        }
+
+        // "If node is an inline node, return true."
+        if (isInlineNode(node)) {
+            return true;
+        }
+
+        // "If node has a child with index offset and that child is a br or hr
+        // or img, but is not a collapsed block prop:"
+        if (offset < node.childNodes.length
+        && isHtmlElement(node.childNodes[offset], ["br", "hr", "img"])
+        && !isCollapsedBlockProp(node.childNodes[offset])) {
+            // "Call collapse(node, offset) on the context object's Selection."
+            getSelection().collapse(node, offset);
+            getActiveRange().setStart(node, offset);
+
+            // "Call extend(node, offset + 1) on the context object's
+            // Selection."
+            getSelection().extend(node, offset + 1);
+            getActiveRange().setEnd(node, offset + 1);
+
+            // "Delete the selection."
+            deleteSelection();
+
+            // "Return true."
+            return true;
+        }
+
+        // "Let end node equal node and let end offset equal offset."
+        var endNode = node;
+        var endOffset = offset;
+
+        // "If end node has a child with index end offset, and that child is a
+        // collapsed block prop, add one to end offset."
+        if (endOffset < endNode.childNodes.length
+        && isCollapsedBlockProp(endNode.childNodes[endOffset])) {
+            endOffset++;
+        }
+
+        // "Repeat the following steps:"
+        while (true) {
+            // "If end offset is the length of end node, set end offset to one
+            // plus the index of end node and then set end node to its parent."
+            if (endOffset == getNodeLength(endNode)) {
+                endOffset = 1 + getNodeIndex(endNode);
+                endNode = endNode.parentNode;
+
+            // "Otherwise, if end node has a an editable invisible child with
+            // index end offset, remove it from end node."
+            } else if (endOffset < endNode.childNodes.length
+            && isEditable(endNode.childNodes[endOffset])
+            && isInvisible(endNode.childNodes[endOffset])) {
+                endNode.removeChild(endNode.childNodes[endOffset]);
+
+            // "Otherwise, break from this loop."
+            } else {
+                break;
+            }
+        }
+
+        // "If the child of end node with index end offset minus one is a
+        // table, return true."
+        if (isHtmlElement(endNode.childNodes[endOffset - 1], "table")) {
+            return true;
+        }
+
+        // "If the child of end node with index end offset is a table:"
+        if (isHtmlElement(endNode.childNodes[endOffset], "table")) {
+            // "Call collapse(end node, end offset) on the context object's
+            // Selection."
+            getSelection().collapse(endNode, endOffset);
+            getActiveRange().setStart(endNode, endOffset);
+
+            // "Call extend(end node, end offset + 1) on the context object's
+            // Selection."
+            getSelection().extend(endNode, endOffset + 1);
+            getActiveRange().setEnd(endNode, endOffset + 1);
+
+            // "Return true."
+            return true;
+        }
+
+        // "If offset is the length of node, and the child of end node with
+        // index end offset is an hr or br:"
+        if (offset == getNodeLength(node)
+        && isHtmlElement(endNode.childNodes[endOffset], ["br", "hr"])) {
+            // "Call collapse(end node, end offset) on the context object's
+            // Selection."
+            getSelection().collapse(endNode, endOffset);
+            getActiveRange().setStart(endNode, endOffset);
+
+            // "Call extend(end node, end offset + 1) on the context object's
+            // Selection."
+            getSelection().extend(endNode, endOffset + 1);
+            getActiveRange().setEnd(endNode, endOffset + 1);
+
+            // "Delete the selection."
+            deleteSelection();
+
+            // "Call collapse(node, offset) on the Selection."
+            getSelection().collapse(node, offset);
+            getActiveRange().setStart(node, offset);
+            getActiveRange().collapse(true);
+
+            // "Return true."
+            return true;
+        }
+
+        // "While end node has a child with index end offset:"
+        while (endOffset < endNode.childNodes.length) {
+            // "If end node's child with index end offset is editable and
+            // invisible, remove it from end node."
+            if (isEditable(endNode.childNodes[endOffset])
+            && isInvisible(endNode.childNodes[endOffset])) {
+                endNode.removeChild(endNode.childNodes[endOffset]);
+
+            // "Otherwise, set end node to its child with index end offset and
+            // set end offset to zero."
+            } else {
+                endNode = endNode.childNodes[endOffset];
+                endOffset = 0;
+            }
+        }
+
+        // "Call collapse(node, offset) on the context object's Selection."
+        getSelection().collapse(node, offset);
+        getActiveRange().setStart(node, offset);
+
+        // "Call extend(end node, end offset) on the context object's
+        // Selection."
+        getSelection().extend(endNode, endOffset);
+        getActiveRange().setEnd(endNode, endOffset);
+
+        // "Delete the selection."
+        deleteSelection();
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The indent command /////
+//@{
+commands.indent = {
+    preservesOverrides: true,
+    action: function() {
+        // "Let items be a list of all lis that are ancestor containers of the
+        // active range's start and/or end node."
+        //
+        // Has to be in tree order, remember!
+        var items = [];
+        for (var node = getActiveRange().endContainer; node != getActiveRange().commonAncestorContainer; node = node.parentNode) {
+            if (isHtmlElement(node, "LI")) {
+                items.unshift(node);
+            }
+        }
+        for (var node = getActiveRange().startContainer; node != getActiveRange().commonAncestorContainer; node = node.parentNode) {
+            if (isHtmlElement(node, "LI")) {
+                items.unshift(node);
+            }
+        }
+        for (var node = getActiveRange().commonAncestorContainer; node; node = node.parentNode) {
+            if (isHtmlElement(node, "LI")) {
+                items.unshift(node);
+            }
+        }
+
+        // "For each item in items, normalize sublists of item."
+        for (var i = 0; i < items.length; i++) {
+            normalizeSublists(items[i]);
+        }
+
+        // "Block-extend the active range, and let new range be the result."
+        var newRange = blockExtend(getActiveRange());
+
+        // "Let node list be a list of nodes, initially empty."
+        var nodeList = [];
+
+        // "For each node node contained in new range, if node is editable and
+        // is an allowed child of "div" or "ol" and if the last member of node
+        // list (if any) is not an ancestor of node, append node to node list."
+        nodeList = getContainedNodes(newRange, function(node) {
+            return isEditable(node)
+                && (isAllowedChild(node, "div")
+                || isAllowedChild(node, "ol"));
+        });
+
+        // "If the first visible member of node list is an li whose parent is
+        // an ol or ul:"
+        if (isHtmlElement(nodeList.filter(isVisible)[0], "li")
+        && isHtmlElement(nodeList.filter(isVisible)[0].parentNode, ["ol", "ul"])) {
+            // "Let sibling be node list's first visible member's
+            // previousSibling."
+            var sibling = nodeList.filter(isVisible)[0].previousSibling;
+
+            // "While sibling is invisible, set sibling to its
+            // previousSibling."
+            while (isInvisible(sibling)) {
+                sibling = sibling.previousSibling;
+            }
+
+            // "If sibling is an li, normalize sublists of sibling."
+            if (isHtmlElement(sibling, "li")) {
+                normalizeSublists(sibling);
+            }
+        }
+
+        // "While node list is not empty:"
+        while (nodeList.length) {
+            // "Let sublist be a list of nodes, initially empty."
+            var sublist = [];
+
+            // "Remove the first member of node list and append it to sublist."
+            sublist.push(nodeList.shift());
+
+            // "While the first member of node list is the nextSibling of the
+            // last member of sublist, remove the first member of node list and
+            // append it to sublist."
+            while (nodeList.length
+            && nodeList[0] == sublist[sublist.length - 1].nextSibling) {
+                sublist.push(nodeList.shift());
+            }
+
+            // "Indent sublist."
+            indentNodes(sublist);
+        }
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The insertHorizontalRule command /////
+//@{
+commands.inserthorizontalrule = {
+    preservesOverrides: true,
+    action: function() {
+        // "Let start node, start offset, end node, and end offset be the
+        // active range's start and end nodes and offsets."
+        var startNode = getActiveRange().startContainer;
+        var startOffset = getActiveRange().startOffset;
+        var endNode = getActiveRange().endContainer;
+        var endOffset = getActiveRange().endOffset;
+
+        // "While start offset is 0 and start node's parent is not null, set
+        // start offset to start node's index, then set start node to its
+        // parent."
+        while (startOffset == 0
+        && startNode.parentNode) {
+            startOffset = getNodeIndex(startNode);
+            startNode = startNode.parentNode;
+        }
+
+        // "While end offset is end node's length, and end node's parent is not
+        // null, set end offset to one plus end node's index, then set end node
+        // to its parent."
+        while (endOffset == getNodeLength(endNode)
+        && endNode.parentNode) {
+            endOffset = 1 + getNodeIndex(endNode);
+            endNode = endNode.parentNode;
+        }
+
+        // "Call collapse(start node, start offset) on the context object's
+        // Selection."
+        getSelection().collapse(startNode, startOffset);
+        getActiveRange().setStart(startNode, startOffset);
+
+        // "Call extend(end node, end offset) on the context object's
+        // Selection."
+        getSelection().extend(endNode, endOffset);
+        getActiveRange().setEnd(endNode, endOffset);
+
+        // "Delete the selection, with block merging false."
+        deleteSelection({blockMerging: false});
+
+        // "If the active range's start node is neither editable nor an editing
+        // host, return true."
+        if (!isEditable(getActiveRange().startContainer)
+        && !isEditingHost(getActiveRange().startContainer)) {
+            return true;
+        }
+
+        // "If the active range's start node is a Text node and its start
+        // offset is zero, call collapse() on the context object's Selection,
+        // with first argument the active range's start node's parent and
+        // second argument the active range's start node's index."
+        if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
+        && getActiveRange().startOffset == 0) {
+            var newNode = getActiveRange().startContainer.parentNode;
+            var newOffset = getNodeIndex(getActiveRange().startContainer);
+            getSelection().collapse(newNode, newOffset);
+            getActiveRange().setStart(newNode, newOffset);
+            getActiveRange().collapse(true);
+        }
+
+        // "If the active range's start node is a Text node and its start
+        // offset is the length of its start node, call collapse() on the
+        // context object's Selection, with first argument the active range's
+        // start node's parent, and the second argument one plus the active
+        // range's start node's index."
+        if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
+        && getActiveRange().startOffset == getNodeLength(getActiveRange().startContainer)) {
+            var newNode = getActiveRange().startContainer.parentNode;
+            var newOffset = 1 + getNodeIndex(getActiveRange().startContainer);
+            getSelection().collapse(newNode, newOffset);
+            getActiveRange().setStart(newNode, newOffset);
+            getActiveRange().collapse(true);
+        }
+
+        // "Let hr be the result of calling createElement("hr") on the
+        // context object."
+        var hr = document.createElement("hr");
+
+        // "Run insertNode(hr) on the active range."
+        getActiveRange().insertNode(hr);
+
+        // "Fix disallowed ancestors of hr."
+        fixDisallowedAncestors(hr);
+
+        // "Run collapse() on the context object's Selection, with first
+        // argument hr's parent and the second argument equal to one plus hr's
+        // index."
+        getSelection().collapse(hr.parentNode, 1 + getNodeIndex(hr));
+        getActiveRange().setStart(hr.parentNode, 1 + getNodeIndex(hr));
+        getActiveRange().collapse(true);
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The insertHTML command /////
+//@{
+commands.inserthtml = {
+    preservesOverrides: true,
+    action: function(value) {
+        // "Delete the selection."
+        deleteSelection();
+
+        // "If the active range's start node is neither editable nor an editing
+        // host, return true."
+        if (!isEditable(getActiveRange().startContainer)
+        && !isEditingHost(getActiveRange().startContainer)) {
+            return true;
+        }
+
+        // "Let frag be the result of calling createContextualFragment(value)
+        // on the active range."
+        var frag = getActiveRange().createContextualFragment(value);
+
+        // "Let last child be the lastChild of frag."
+        var lastChild = frag.lastChild;
+
+        // "If last child is null, return true."
+        if (!lastChild) {
+            return true;
+        }
+
+        // "Let descendants be all descendants of frag."
+        var descendants = getDescendants(frag);
+
+        // "If the active range's start node is a block node:"
+        if (isBlockNode(getActiveRange().startContainer)) {
+            // "Let collapsed block props be all editable collapsed block prop
+            // children of the active range's start node that have index
+            // greater than or equal to the active range's start offset."
+            //
+            // "For each node in collapsed block props, remove node from its
+            // parent."
+            [].filter.call(getActiveRange().startContainer.childNodes, function(node) {
+                return isEditable(node)
+                    && isCollapsedBlockProp(node)
+                    && getNodeIndex(node) >= getActiveRange().startOffset;
+            }).forEach(function(node) {
+                node.parentNode.removeChild(node);
+            });
+        }
+
+        // "Call insertNode(frag) on the active range."
+        getActiveRange().insertNode(frag);
+
+        // "If the active range's start node is a block node with no visible
+        // children, call createElement("br") on the context object and append
+        // the result as the last child of the active range's start node."
+        if (isBlockNode(getActiveRange().startContainer)
+        && ![].some.call(getActiveRange().startContainer.childNodes, isVisible)) {
+            getActiveRange().startContainer.appendChild(document.createElement("br"));
+        }
+
+        // "Call collapse() on the context object's Selection, with last
+        // child's parent as the first argument and one plus its index as the
+        // second."
+        getActiveRange().setStart(lastChild.parentNode, 1 + getNodeIndex(lastChild));
+        getActiveRange().setEnd(lastChild.parentNode, 1 + getNodeIndex(lastChild));
+
+        // "Fix disallowed ancestors of each member of descendants."
+        for (var i = 0; i < descendants.length; i++) {
+            fixDisallowedAncestors(descendants[i]);
+        }
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The insertImage command /////
+//@{
+commands.insertimage = {
+    preservesOverrides: true,
+    action: function(value) {
+        // "If value is the empty string, return false."
+        if (value === "") {
+            return false;
+        }
+
+        // "Delete the selection, with strip wrappers false."
+        deleteSelection({stripWrappers: false});
+
+        // "Let range be the active range."
+        var range = getActiveRange();
+
+        // "If the active range's start node is neither editable nor an editing
+        // host, return true."
+        if (!isEditable(getActiveRange().startContainer)
+        && !isEditingHost(getActiveRange().startContainer)) {
+            return true;
+        }
+
+        // "If range's start node is a block node whose sole child is a br, and
+        // its start offset is 0, remove its start node's child from it."
+        if (isBlockNode(range.startContainer)
+        && range.startContainer.childNodes.length == 1
+        && isHtmlElement(range.startContainer.firstChild, "br")
+        && range.startOffset == 0) {
+            range.startContainer.removeChild(range.startContainer.firstChild);
+        }
+
+        // "Let img be the result of calling createElement("img") on the
+        // context object."
+        var img = document.createElement("img");
+
+        // "Run setAttribute("src", value) on img."
+        img.setAttribute("src", value);
+
+        // "Run insertNode(img) on the range."
+        range.insertNode(img);
+
+        // "Run collapse() on the Selection, with first argument equal to the
+        // parent of img and the second argument equal to one plus the index of
+        // img."
+        //
+        // Not everyone actually supports collapse(), so we do it manually
+        // instead.  Also, we need to modify the actual range we're given as
+        // well, for the sake of autoimplementation.html's range-filling-in.
+        range.setStart(img.parentNode, 1 + getNodeIndex(img));
+        range.setEnd(img.parentNode, 1 + getNodeIndex(img));
+        getSelection().removeAllRanges();
+        getSelection().addRange(range);
+
+        // IE adds width and height attributes for some reason, so remove those
+        // to actually do what the spec says.
+        img.removeAttribute("width");
+        img.removeAttribute("height");
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The insertLineBreak command /////
+//@{
+commands.insertlinebreak = {
+    preservesOverrides: true,
+    action: function(value) {
+        // "Delete the selection, with strip wrappers false."
+        deleteSelection({stripWrappers: false});
+
+        // "If the active range's start node is neither editable nor an editing
+        // host, return true."
+        if (!isEditable(getActiveRange().startContainer)
+        && !isEditingHost(getActiveRange().startContainer)) {
+            return true;
+        }
+
+        // "If the active range's start node is an Element, and "br" is not an
+        // allowed child of it, return true."
+        if (getActiveRange().startContainer.nodeType == Node.ELEMENT_NODE
+        && !isAllowedChild("br", getActiveRange().startContainer)) {
+            return true;
+        }
+
+        // "If the active range's start node is not an Element, and "br" is not
+        // an allowed child of the active range's start node's parent, return
+        // true."
+        if (getActiveRange().startContainer.nodeType != Node.ELEMENT_NODE
+        && !isAllowedChild("br", getActiveRange().startContainer.parentNode)) {
+            return true;
+        }
+
+        // "If the active range's start node is a Text node and its start
+        // offset is zero, call collapse() on the context object's Selection,
+        // with first argument equal to the active range's start node's parent
+        // and second argument equal to the active range's start node's index."
+        if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
+        && getActiveRange().startOffset == 0) {
+            var newNode = getActiveRange().startContainer.parentNode;
+            var newOffset = getNodeIndex(getActiveRange().startContainer);
+            getSelection().collapse(newNode, newOffset);
+            getActiveRange().setStart(newNode, newOffset);
+            getActiveRange().setEnd(newNode, newOffset);
+        }
+
+        // "If the active range's start node is a Text node and its start
+        // offset is the length of its start node, call collapse() on the
+        // context object's Selection, with first argument equal to the active
+        // range's start node's parent and second argument equal to one plus
+        // the active range's start node's index."
+        if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
+        && getActiveRange().startOffset == getNodeLength(getActiveRange().startContainer)) {
+            var newNode = getActiveRange().startContainer.parentNode;
+            var newOffset = 1 + getNodeIndex(getActiveRange().startContainer);
+            getSelection().collapse(newNode, newOffset);
+            getActiveRange().setStart(newNode, newOffset);
+            getActiveRange().setEnd(newNode, newOffset);
+        }
+
+        // "Let br be the result of calling createElement("br") on the context
+        // object."
+        var br = document.createElement("br");
+
+        // "Call insertNode(br) on the active range."
+        getActiveRange().insertNode(br);
+
+        // "Call collapse() on the context object's Selection, with br's parent
+        // as the first argument and one plus br's index as the second
+        // argument."
+        getSelection().collapse(br.parentNode, 1 + getNodeIndex(br));
+        getActiveRange().setStart(br.parentNode, 1 + getNodeIndex(br));
+        getActiveRange().setEnd(br.parentNode, 1 + getNodeIndex(br));
+
+        // "If br is a collapsed line break, call createElement("br") on the
+        // context object and let extra br be the result, then call
+        // insertNode(extra br) on the active range."
+        if (isCollapsedLineBreak(br)) {
+            getActiveRange().insertNode(document.createElement("br"));
+
+            // Compensate for nonstandard implementations of insertNode
+            getSelection().collapse(br.parentNode, 1 + getNodeIndex(br));
+            getActiveRange().setStart(br.parentNode, 1 + getNodeIndex(br));
+            getActiveRange().setEnd(br.parentNode, 1 + getNodeIndex(br));
+        }
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The insertOrderedList command /////
+//@{
+commands.insertorderedlist = {
+    preservesOverrides: true,
+    // "Toggle lists with tag name "ol", then return true."
+    action: function() { toggleLists("ol"); return true },
+    // "True if the selection's list state is "mixed" or "mixed ol", false
+    // otherwise."
+    indeterm: function() { return /^mixed( ol)?$/.test(getSelectionListState()) },
+    // "True if the selection's list state is "ol", false otherwise."
+    state: function() { return getSelectionListState() == "ol" },
+};
+
+//@}
+///// The insertParagraph command /////
+//@{
+commands.insertparagraph = {
+    preservesOverrides: true,
+    action: function() {
+        // "Delete the selection."
+        deleteSelection();
+
+        // "If the active range's start node is neither editable nor an editing
+        // host, return true."
+        if (!isEditable(getActiveRange().startContainer)
+        && !isEditingHost(getActiveRange().startContainer)) {
+            return true;
+        }
+
+        // "Let node and offset be the active range's start node and offset."
+        var node = getActiveRange().startContainer;
+        var offset = getActiveRange().startOffset;
+
+        // "If node is a Text node, and offset is neither 0 nor the length of
+        // node, call splitText(offset) on node."
+        if (node.nodeType == Node.TEXT_NODE
+        && offset != 0
+        && offset != getNodeLength(node)) {
+            node.splitText(offset);
+        }
+
+        // "If node is a Text node and offset is its length, set offset to one
+        // plus the index of node, then set node to its parent."
+        if (node.nodeType == Node.TEXT_NODE
+        && offset == getNodeLength(node)) {
+            offset = 1 + getNodeIndex(node);
+            node = node.parentNode;
+        }
+
+        // "If node is a Text or Comment node, set offset to the index of node,
+        // then set node to its parent."
+        if (node.nodeType == Node.TEXT_NODE
+        || node.nodeType == Node.COMMENT_NODE) {
+            offset = getNodeIndex(node);
+            node = node.parentNode;
+        }
+
+        // "Call collapse(node, offset) on the context object's Selection."
+        getSelection().collapse(node, offset);
+        getActiveRange().setStart(node, offset);
+        getActiveRange().setEnd(node, offset);
+
+        // "Let container equal node."
+        var container = node;
+
+        // "While container is not a single-line container, and container's
+        // parent is editable and in the same editing host as node, set
+        // container to its parent."
+        while (!isSingleLineContainer(container)
+        && isEditable(container.parentNode)
+        && inSameEditingHost(node, container.parentNode)) {
+            container = container.parentNode;
+        }
+
+        // "If container is an editable single-line container in the same
+        // editing host as node, and its local name is "p" or "div":"
+        if (isEditable(container)
+        && isSingleLineContainer(container)
+        && inSameEditingHost(node, container.parentNode)
+        && (container.tagName == "P" || container.tagName == "DIV")) {
+            // "Let outer container equal container."
+            var outerContainer = container;
+
+            // "While outer container is not a dd or dt or li, and outer
+            // container's parent is editable, set outer container to its
+            // parent."
+            while (!isHtmlElement(outerContainer, ["dd", "dt", "li"])
+            && isEditable(outerContainer.parentNode)) {
+                outerContainer = outerContainer.parentNode;
+            }
+
+            // "If outer container is a dd or dt or li, set container to outer
+            // container."
+            if (isHtmlElement(outerContainer, ["dd", "dt", "li"])) {
+                container = outerContainer;
+            }
+        }
+
+        // "If container is not editable or not in the same editing host as
+        // node or is not a single-line container:"
+        if (!isEditable(container)
+        || !inSameEditingHost(container, node)
+        || !isSingleLineContainer(container)) {
+            // "Let tag be the default single-line container name."
+            var tag = defaultSingleLineContainerName;
+
+            // "Block-extend the active range, and let new range be the
+            // result."
+            var newRange = blockExtend(getActiveRange());
+
+            // "Let node list be a list of nodes, initially empty."
+            //
+            // "Append to node list the first node in tree order that is
+            // contained in new range and is an allowed child of "p", if any."
+            var nodeList = getContainedNodes(newRange, function(node) { return isAllowedChild(node, "p") })
+                .slice(0, 1);
+
+            // "If node list is empty:"
+            if (!nodeList.length) {
+                // "If tag is not an allowed child of the active range's start
+                // node, return true."
+                if (!isAllowedChild(tag, getActiveRange().startContainer)) {
+                    return true;
+                }
+
+                // "Set container to the result of calling createElement(tag)
+                // on the context object."
+                container = document.createElement(tag);
+
+                // "Call insertNode(container) on the active range."
+                getActiveRange().insertNode(container);
+
+                // "Call createElement("br") on the context object, and append
+                // the result as the last child of container."
+                container.appendChild(document.createElement("br"));
+
+                // "Call collapse(container, 0) on the context object's
+                // Selection."
+                getSelection().collapse(container, 0);
+                getActiveRange().setStart(container, 0);
+                getActiveRange().setEnd(container, 0);
+
+                // "Return true."
+                return true;
+            }
+
+            // "While the nextSibling of the last member of node list is not
+            // null and is an allowed child of "p", append it to node list."
+            while (nodeList[nodeList.length - 1].nextSibling
+            && isAllowedChild(nodeList[nodeList.length - 1].nextSibling, "p")) {
+                nodeList.push(nodeList[nodeList.length - 1].nextSibling);
+            }
+
+            // "Wrap node list, with sibling criteria returning false and new
+            // parent instructions returning the result of calling
+            // createElement(tag) on the context object. Set container to the
+            // result."
+            container = wrap(nodeList,
+                function() { return false },
+                function() { return document.createElement(tag) }
+            );
+        }
+
+        // "If container's local name is "address", "listing", or "pre":"
+        if (container.tagName == "ADDRESS"
+        || container.tagName == "LISTING"
+        || container.tagName == "PRE") {
+            // "Let br be the result of calling createElement("br") on the
+            // context object."
+            var br = document.createElement("br");
+
+            // "Call insertNode(br) on the active range."
+            getActiveRange().insertNode(br);
+
+            // "Call collapse(node, offset + 1) on the context object's
+            // Selection."
+            getSelection().collapse(node, offset + 1);
+            getActiveRange().setStart(node, offset + 1);
+            getActiveRange().setEnd(node, offset + 1);
+
+            // "If br is the last descendant of container, let br be the result
+            // of calling createElement("br") on the context object, then call
+            // insertNode(br) on the active range."
+            //
+            // Work around browser bugs: some browsers select the
+            // newly-inserted node, not per spec.
+            if (!isDescendant(nextNode(br), container)) {
+                getActiveRange().insertNode(document.createElement("br"));
+                getSelection().collapse(node, offset + 1);
+                getActiveRange().setEnd(node, offset + 1);
+            }
+
+            // "Return true."
+            return true;
+        }
+
+        // "If container's local name is "li", "dt", or "dd"; and either it has
+        // no children or it has a single child and that child is a br:"
+        if (["LI", "DT", "DD"].indexOf(container.tagName) != -1
+        && (!container.hasChildNodes()
+        || (container.childNodes.length == 1
+        && isHtmlElement(container.firstChild, "br")))) {
+            // "Split the parent of the one-node list consisting of container."
+            splitParent([container]);
+
+            // "If container has no children, call createElement("br") on the
+            // context object and append the result as the last child of
+            // container."
+            if (!container.hasChildNodes()) {
+                container.appendChild(document.createElement("br"));
+            }
+
+            // "If container is a dd or dt, and it is not an allowed child of
+            // any of its ancestors in the same editing host, set the tag name
+            // of container to the default single-line container name and let
+            // container be the result."
+            if (isHtmlElement(container, ["dd", "dt"])
+            && getAncestors(container).every(function(ancestor) {
+                return !inSameEditingHost(container, ancestor)
+                    || !isAllowedChild(container, ancestor)
+            })) {
+                container = setTagName(container, defaultSingleLineContainerName);
+            }
+
+            // "Fix disallowed ancestors of container."
+            fixDisallowedAncestors(container);
+
+            // "Return true."
+            return true;
+        }
+
+        // "Let new line range be a new range whose start is the same as
+        // the active range's, and whose end is (container, length of
+        // container)."
+        var newLineRange = document.createRange();
+        newLineRange.setStart(getActiveRange().startContainer, getActiveRange().startOffset);
+        newLineRange.setEnd(container, getNodeLength(container));
+
+        // "While new line range's start offset is zero and its start node is
+        // not a prohibited paragraph child, set its start to (parent of start
+        // node, index of start node)."
+        while (newLineRange.startOffset == 0
+        && !isProhibitedParagraphChild(newLineRange.startContainer)) {
+            newLineRange.setStart(newLineRange.startContainer.parentNode, getNodeIndex(newLineRange.startContainer));
+        }
+
+        // "While new line range's start offset is the length of its start node
+        // and its start node is not a prohibited paragraph child, set its
+        // start to (parent of start node, 1 + index of start node)."
+        while (newLineRange.startOffset == getNodeLength(newLineRange.startContainer)
+        && !isProhibitedParagraphChild(newLineRange.startContainer)) {
+            newLineRange.setStart(newLineRange.startContainer.parentNode, 1 + getNodeIndex(newLineRange.startContainer));
+        }
+
+        // "Let end of line be true if new line range contains either nothing
+        // or a single br, and false otherwise."
+        var containedInNewLineRange = getContainedNodes(newLineRange);
+        var endOfLine = !containedInNewLineRange.length
+            || (containedInNewLineRange.length == 1
+            && isHtmlElement(containedInNewLineRange[0], "br"));
+
+        // "If the local name of container is "h1", "h2", "h3", "h4", "h5", or
+        // "h6", and end of line is true, let new container name be the default
+        // single-line container name."
+        var newContainerName;
+        if (/^H[1-6]$/.test(container.tagName)
+        && endOfLine) {
+            newContainerName = defaultSingleLineContainerName;
+
+        // "Otherwise, if the local name of container is "dt" and end of line
+        // is true, let new container name be "dd"."
+        } else if (container.tagName == "DT"
+        && endOfLine) {
+            newContainerName = "dd";
+
+        // "Otherwise, if the local name of container is "dd" and end of line
+        // is true, let new container name be "dt"."
+        } else if (container.tagName == "DD"
+        && endOfLine) {
+            newContainerName = "dt";
+
+        // "Otherwise, let new container name be the local name of container."
+        } else {
+            newContainerName = container.tagName.toLowerCase();
+        }
+
+        // "Let new container be the result of calling createElement(new
+        // container name) on the context object."
+        var newContainer = document.createElement(newContainerName);
+
+        // "Copy all attributes of container to new container."
+        for (var i = 0; i < container.attributes.length; i++) {
+            newContainer.setAttributeNS(container.attributes[i].namespaceURI, container.attributes[i].name, container.attributes[i].value);
+        }
+
+        // "If new container has an id attribute, unset it."
+        newContainer.removeAttribute("id");
+
+        // "Insert new container into the parent of container immediately after
+        // container."
+        container.parentNode.insertBefore(newContainer, container.nextSibling);
+
+        // "Let contained nodes be all nodes contained in new line range."
+        var containedNodes = getAllContainedNodes(newLineRange);
+
+        // "Let frag be the result of calling extractContents() on new line
+        // range."
+        var frag = newLineRange.extractContents();
+
+        // "Unset the id attribute (if any) of each Element descendant of frag
+        // that is not in contained nodes."
+        var descendants = getDescendants(frag);
+        for (var i = 0; i < descendants.length; i++) {
+            if (descendants[i].nodeType == Node.ELEMENT_NODE
+            && containedNodes.indexOf(descendants[i]) == -1) {
+                descendants[i].removeAttribute("id");
+            }
+        }
+
+        // "Call appendChild(frag) on new container."
+        newContainer.appendChild(frag);
+
+        // "While container's lastChild is a prohibited paragraph child, set
+        // container to its lastChild."
+        while (isProhibitedParagraphChild(container.lastChild)) {
+            container = container.lastChild;
+        }
+
+        // "While new container's lastChild is a prohibited paragraph child,
+        // set new container to its lastChild."
+        while (isProhibitedParagraphChild(newContainer.lastChild)) {
+            newContainer = newContainer.lastChild;
+        }
+
+        // "If container has no visible children, call createElement("br") on
+        // the context object, and append the result as the last child of
+        // container."
+        if (![].some.call(container.childNodes, isVisible)) {
+            container.appendChild(document.createElement("br"));
+        }
+
+        // "If new container has no visible children, call createElement("br")
+        // on the context object, and append the result as the last child of
+        // new container."
+        if (![].some.call(newContainer.childNodes, isVisible)) {
+            newContainer.appendChild(document.createElement("br"));
+        }
+
+        // "Call collapse(new container, 0) on the context object's Selection."
+        getSelection().collapse(newContainer, 0);
+        getActiveRange().setStart(newContainer, 0);
+        getActiveRange().setEnd(newContainer, 0);
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The insertText command /////
+//@{
+commands.inserttext = {
+    action: function(value) {
+        // "Delete the selection, with strip wrappers false."
+        deleteSelection({stripWrappers: false});
+
+        // "If the active range's start node is neither editable nor an editing
+        // host, return true."
+        if (!isEditable(getActiveRange().startContainer)
+        && !isEditingHost(getActiveRange().startContainer)) {
+            return true;
+        }
+
+        // "If value's length is greater than one:"
+        if (value.length > 1) {
+            // "For each element el in value, take the action for the
+            // insertText command, with value equal to el."
+            for (var i = 0; i < value.length; i++) {
+                commands.inserttext.action(value[i]);
+            }
+
+            // "Return true."
+            return true;
+        }
+
+        // "If value is the empty string, return true."
+        if (value == "") {
+            return true;
+        }
+
+        // "If value is a newline (U+00A0), take the action for the
+        // insertParagraph command and return true."
+        if (value == "\n") {
+            commands.insertparagraph.action();
+            return true;
+        }
+
+        // "Let node and offset be the active range's start node and offset."
+        var node = getActiveRange().startContainer;
+        var offset = getActiveRange().startOffset;
+
+        // "If node has a child whose index is offset − 1, and that child is a
+        // Text node, set node to that child, then set offset to node's
+        // length."
+        if (0 <= offset - 1
+        && offset - 1 < node.childNodes.length
+        && node.childNodes[offset - 1].nodeType == Node.TEXT_NODE) {
+            node = node.childNodes[offset - 1];
+            offset = getNodeLength(node);
+        }
+
+        // "If node has a child whose index is offset, and that child is a Text
+        // node, set node to that child, then set offset to zero."
+        if (0 <= offset
+        && offset < node.childNodes.length
+        && node.childNodes[offset].nodeType == Node.TEXT_NODE) {
+            node = node.childNodes[offset];
+            offset = 0;
+        }
+
+        // "Record current overrides, and let overrides be the result."
+        var overrides = recordCurrentOverrides();
+
+        // "Call collapse(node, offset) on the context object's Selection."
+        getSelection().collapse(node, offset);
+        getActiveRange().setStart(node, offset);
+        getActiveRange().setEnd(node, offset);
+
+        // "Canonicalize whitespace at (node, offset)."
+        canonicalizeWhitespace(node, offset);
+
+        // "Let (node, offset) be the active range's start."
+        node = getActiveRange().startContainer;
+        offset = getActiveRange().startOffset;
+
+        // "If node is a Text node:"
+        if (node.nodeType == Node.TEXT_NODE) {
+            // "Call insertData(offset, value) on node."
+            node.insertData(offset, value);
+
+            // "Call collapse(node, offset) on the context object's Selection."
+            getSelection().collapse(node, offset);
+            getActiveRange().setStart(node, offset);
+
+            // "Call extend(node, offset + 1) on the context object's
+            // Selection."
+            //
+            // Work around WebKit bug: the extend() can throw if the text we're
+            // adding is trailing whitespace.
+            try { getSelection().extend(node, offset + 1); } catch(e) {}
+            getActiveRange().setEnd(node, offset + 1);
+
+        // "Otherwise:"
+        } else {
+            // "If node has only one child, which is a collapsed line break,
+            // remove its child from it."
+            //
+            // FIXME: IE incorrectly returns false here instead of true
+            // sometimes?
+            if (node.childNodes.length == 1
+            && isCollapsedLineBreak(node.firstChild)) {
+                node.removeChild(node.firstChild);
+            }
+
+            // "Let text be the result of calling createTextNode(value) on the
+            // context object."
+            var text = document.createTextNode(value);
+
+            // "Call insertNode(text) on the active range."
+            getActiveRange().insertNode(text);
+
+            // "Call collapse(text, 0) on the context object's Selection."
+            getSelection().collapse(text, 0);
+            getActiveRange().setStart(text, 0);
+
+            // "Call extend(text, 1) on the context object's Selection."
+            getSelection().extend(text, 1);
+            getActiveRange().setEnd(text, 1);
+        }
+
+        // "Restore states and values from overrides."
+        restoreStatesAndValues(overrides);
+
+        // "Canonicalize whitespace at the active range's start, with fix
+        // collapsed space false."
+        canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset, false);
+
+        // "Canonicalize whitespace at the active range's end, with fix
+        // collapsed space false."
+        canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset, false);
+
+        // "If value is a space character, autolink the active range's start."
+        if (/^[ \t\n\f\r]$/.test(value)) {
+            autolink(getActiveRange().startContainer, getActiveRange().startOffset);
+        }
+
+        // "Call collapseToEnd() on the context object's Selection."
+        //
+        // Work around WebKit bug: sometimes it blows up the selection and
+        // throws, which we don't want.
+        try { getSelection().collapseToEnd(); } catch(e) {}
+        getActiveRange().collapse(false);
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The insertUnorderedList command /////
+//@{
+commands.insertunorderedlist = {
+    preservesOverrides: true,
+    // "Toggle lists with tag name "ul", then return true."
+    action: function() { toggleLists("ul"); return true },
+    // "True if the selection's list state is "mixed" or "mixed ul", false
+    // otherwise."
+    indeterm: function() { return /^mixed( ul)?$/.test(getSelectionListState()) },
+    // "True if the selection's list state is "ul", false otherwise."
+    state: function() { return getSelectionListState() == "ul" },
+};
+
+//@}
+///// The justifyCenter command /////
+//@{
+commands.justifycenter = {
+    preservesOverrides: true,
+    // "Justify the selection with alignment "center", then return true."
+    action: function() { justifySelection("center"); return true },
+    indeterm: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if among visible editable nodes that
+        // are contained in the result and have no children, at least one has
+        // alignment value "center" and at least one does not. Otherwise return
+        // false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.some(function(node) { return getAlignmentValue(node) == "center" })
+            && nodes.some(function(node) { return getAlignmentValue(node) != "center" });
+    }, state: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if there is at least one visible
+        // editable node that is contained in the result and has no children,
+        // and all such nodes have alignment value "center".  Otherwise return
+        // false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.length
+            && nodes.every(function(node) { return getAlignmentValue(node) == "center" });
+    }, value: function() {
+        // "Return the empty string if the active range is null.  Otherwise,
+        // block-extend the active range, and return the alignment value of the
+        // first visible editable node that is contained in the result and has
+        // no children. If there is no such node, return "left"."
+        if (!getActiveRange()) {
+            return "";
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        if (nodes.length) {
+            return getAlignmentValue(nodes[0]);
+        } else {
+            return "left";
+        }
+    },
+};
+
+//@}
+///// The justifyFull command /////
+//@{
+commands.justifyfull = {
+    preservesOverrides: true,
+    // "Justify the selection with alignment "justify", then return true."
+    action: function() { justifySelection("justify"); return true },
+    indeterm: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if among visible editable nodes that
+        // are contained in the result and have no children, at least one has
+        // alignment value "justify" and at least one does not. Otherwise
+        // return false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.some(function(node) { return getAlignmentValue(node) == "justify" })
+            && nodes.some(function(node) { return getAlignmentValue(node) != "justify" });
+    }, state: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if there is at least one visible
+        // editable node that is contained in the result and has no children,
+        // and all such nodes have alignment value "justify".  Otherwise return
+        // false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.length
+            && nodes.every(function(node) { return getAlignmentValue(node) == "justify" });
+    }, value: function() {
+        // "Return the empty string if the active range is null.  Otherwise,
+        // block-extend the active range, and return the alignment value of the
+        // first visible editable node that is contained in the result and has
+        // no children. If there is no such node, return "left"."
+        if (!getActiveRange()) {
+            return "";
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        if (nodes.length) {
+            return getAlignmentValue(nodes[0]);
+        } else {
+            return "left";
+        }
+    },
+};
+
+//@}
+///// The justifyLeft command /////
+//@{
+commands.justifyleft = {
+    preservesOverrides: true,
+    // "Justify the selection with alignment "left", then return true."
+    action: function() { justifySelection("left"); return true },
+    indeterm: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if among visible editable nodes that
+        // are contained in the result and have no children, at least one has
+        // alignment value "left" and at least one does not. Otherwise return
+        // false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.some(function(node) { return getAlignmentValue(node) == "left" })
+            && nodes.some(function(node) { return getAlignmentValue(node) != "left" });
+    }, state: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if there is at least one visible
+        // editable node that is contained in the result and has no children,
+        // and all such nodes have alignment value "left".  Otherwise return
+        // false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.length
+            && nodes.every(function(node) { return getAlignmentValue(node) == "left" });
+    }, value: function() {
+        // "Return the empty string if the active range is null.  Otherwise,
+        // block-extend the active range, and return the alignment value of the
+        // first visible editable node that is contained in the result and has
+        // no children. If there is no such node, return "left"."
+        if (!getActiveRange()) {
+            return "";
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        if (nodes.length) {
+            return getAlignmentValue(nodes[0]);
+        } else {
+            return "left";
+        }
+    },
+};
+
+//@}
+///// The justifyRight command /////
+//@{
+commands.justifyright = {
+    preservesOverrides: true,
+    // "Justify the selection with alignment "right", then return true."
+    action: function() { justifySelection("right"); return true },
+    indeterm: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if among visible editable nodes that
+        // are contained in the result and have no children, at least one has
+        // alignment value "right" and at least one does not. Otherwise return
+        // false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.some(function(node) { return getAlignmentValue(node) == "right" })
+            && nodes.some(function(node) { return getAlignmentValue(node) != "right" });
+    }, state: function() {
+        // "Return false if the active range is null.  Otherwise, block-extend
+        // the active range. Return true if there is at least one visible
+        // editable node that is contained in the result and has no children,
+        // and all such nodes have alignment value "right".  Otherwise return
+        // false."
+        if (!getActiveRange()) {
+            return false;
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        return nodes.length
+            && nodes.every(function(node) { return getAlignmentValue(node) == "right" });
+    }, value: function() {
+        // "Return the empty string if the active range is null.  Otherwise,
+        // block-extend the active range, and return the alignment value of the
+        // first visible editable node that is contained in the result and has
+        // no children. If there is no such node, return "left"."
+        if (!getActiveRange()) {
+            return "";
+        }
+        var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
+            return isEditable(node) && isVisible(node) && !node.hasChildNodes();
+        });
+        if (nodes.length) {
+            return getAlignmentValue(nodes[0]);
+        } else {
+            return "left";
+        }
+    },
+};
+
+//@}
+///// The outdent command /////
+//@{
+commands.outdent = {
+    preservesOverrides: true,
+    action: function() {
+        // "Let items be a list of all lis that are ancestor containers of the
+        // range's start and/or end node."
+        //
+        // It's annoying to get this in tree order using functional stuff
+        // without doing getDescendants(document), which is slow, so I do it
+        // imperatively.
+        var items = [];
+        (function(){
+            for (
+                var ancestorContainer = getActiveRange().endContainer;
+                ancestorContainer != getActiveRange().commonAncestorContainer;
+                ancestorContainer = ancestorContainer.parentNode
+            ) {
+                if (isHtmlElement(ancestorContainer, "li")) {
+                    items.unshift(ancestorContainer);
+                }
+            }
+            for (
+                var ancestorContainer = getActiveRange().startContainer;
+                ancestorContainer;
+                ancestorContainer = ancestorContainer.parentNode
+            ) {
+                if (isHtmlElement(ancestorContainer, "li")) {
+                    items.unshift(ancestorContainer);
+                }
+            }
+        })();
+
+        // "For each item in items, normalize sublists of item."
+        items.forEach(normalizeSublists);
+
+        // "Block-extend the active range, and let new range be the result."
+        var newRange = blockExtend(getActiveRange());
+
+        // "Let node list be a list of nodes, initially empty."
+        //
+        // "For each node node contained in new range, append node to node list
+        // if the last member of node list (if any) is not an ancestor of node;
+        // node is editable; and either node has no editable descendants, or is
+        // an ol or ul, or is an li whose parent is an ol or ul."
+        var nodeList = getContainedNodes(newRange, function(node) {
+            return isEditable(node)
+                && (!getDescendants(node).some(isEditable)
+                || isHtmlElement(node, ["ol", "ul"])
+                || (isHtmlElement(node, "li") && isHtmlElement(node.parentNode, ["ol", "ul"])));
+        });
+
+        // "While node list is not empty:"
+        while (nodeList.length) {
+            // "While the first member of node list is an ol or ul or is not
+            // the child of an ol or ul, outdent it and remove it from node
+            // list."
+            while (nodeList.length
+            && (isHtmlElement(nodeList[0], ["OL", "UL"])
+            || !isHtmlElement(nodeList[0].parentNode, ["OL", "UL"]))) {
+                outdentNode(nodeList.shift());
+            }
+
+            // "If node list is empty, break from these substeps."
+            if (!nodeList.length) {
+                break;
+            }
+
+            // "Let sublist be a list of nodes, initially empty."
+            var sublist = [];
+
+            // "Remove the first member of node list and append it to sublist."
+            sublist.push(nodeList.shift());
+
+            // "While the first member of node list is the nextSibling of the
+            // last member of sublist, and the first member of node list is not
+            // an ol or ul, remove the first member of node list and append it
+            // to sublist."
+            while (nodeList.length
+            && nodeList[0] == sublist[sublist.length - 1].nextSibling
+            && !isHtmlElement(nodeList[0], ["OL", "UL"])) {
+                sublist.push(nodeList.shift());
+            }
+
+            // "Record the values of sublist, and let values be the result."
+            var values = recordValues(sublist);
+
+            // "Split the parent of sublist, with new parent null."
+            splitParent(sublist);
+
+            // "Fix disallowed ancestors of each member of sublist."
+            sublist.forEach(fixDisallowedAncestors);
+
+            // "Restore the values from values."
+            restoreValues(values);
+        }
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+
+//////////////////////////////////
+///// Miscellaneous commands /////
+//////////////////////////////////
+
+///// The defaultParagraphSeparator command /////
+//@{
+commands.defaultparagraphseparator = {
+    action: function(value) {
+        // "Let value be converted to ASCII lowercase. If value is then equal
+        // to "p" or "div", set the context object's default single-line
+        // container name to value and return true. Otherwise, return false."
+        value = value.toLowerCase();
+        if (value == "p" || value == "div") {
+            defaultSingleLineContainerName = value;
+            return true;
+        }
+        return false;
+    }, value: function() {
+        // "Return the context object's default single-line container name."
+        return defaultSingleLineContainerName;
+    },
+};
+
+//@}
+///// The selectAll command /////
+//@{
+commands.selectall = {
+    // Note, this ignores the whole globalRange/getActiveRange() thing and
+    // works with actual selections.  Not suitable for autoimplementation.html.
+    action: function() {
+        // "Let target be the body element of the context object."
+        var target = document.body;
+
+        // "If target is null, let target be the context object's
+        // documentElement."
+        if (!target) {
+            target = document.documentElement;
+        }
+
+        // "If target is null, call getSelection() on the context object, and
+        // call removeAllRanges() on the result."
+        if (!target) {
+            getSelection().removeAllRanges();
+
+        // "Otherwise, call getSelection() on the context object, and call
+        // selectAllChildren(target) on the result."
+        } else {
+            getSelection().selectAllChildren(target);
+        }
+
+        // "Return true."
+        return true;
+    }
+};
+
+//@}
+///// The styleWithCSS command /////
+//@{
+commands.stylewithcss = {
+    action: function(value) {
+        // "If value is an ASCII case-insensitive match for the string
+        // "false", set the CSS styling flag to false. Otherwise, set the
+        // CSS styling flag to true.  Either way, return true."
+        cssStylingFlag = String(value).toLowerCase() != "false";
+        return true;
+    }, state: function() { return cssStylingFlag }
+};
+
+//@}
+///// The useCSS command /////
+//@{
+commands.usecss = {
+    action: function(value) {
+        // "If value is an ASCII case-insensitive match for the string "false",
+        // set the CSS styling flag to true. Otherwise, set the CSS styling
+        // flag to false.  Either way, return true."
+        cssStylingFlag = String(value).toLowerCase() == "false";
+        return true;
+    }
+};
+//@}
+
+// Some final setup
+//@{
+(function() {
+// Opera 11.50 doesn't implement Object.keys, so I have to make an explicit
+// temporary, which means I need an extra closure to not leak the temporaries
+// into the global namespace.  >:(
+var commandNames = [];
+for (var command in commands) {
+    commandNames.push(command);
+}
+commandNames.forEach(function(command) {
+    // "If a command does not have a relevant CSS property specified, it
+    // defaults to null."
+    if (!("relevantCssProperty" in commands[command])) {
+        commands[command].relevantCssProperty = null;
+    }
+
+    // "If a command has inline command activated values defined but nothing
+    // else defines when it is indeterminate, it is indeterminate if among
+    // formattable nodes effectively contained in the active range, there is at
+    // least one whose effective command value is one of the given values and
+    // at least one whose effective command value is not one of the given
+    // values."
+    if ("inlineCommandActivatedValues" in commands[command]
+    && !("indeterm" in commands[command])) {
+        commands[command].indeterm = function() {
+            if (!getActiveRange()) {
+                return false;
+            }
+
+            var values = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)
+                .map(function(node) { return getEffectiveCommandValue(node, command) });
+
+            var matchingValues = values.filter(function(value) {
+                return commands[command].inlineCommandActivatedValues.indexOf(value) != -1;
+            });
+
+            return matchingValues.length >= 1
+                && values.length - matchingValues.length >= 1;
+        };
+    }
+
+    // "If a command has inline command activated values defined, its state is
+    // true if either no formattable node is effectively contained in the
+    // active range, and the active range's start node's effective command
+    // value is one of the given values; or if there is at least one
+    // formattable node effectively contained in the active range, and all of
+    // them have an effective command value equal to one of the given values."
+    if ("inlineCommandActivatedValues" in commands[command]) {
+        commands[command].state = function() {
+            if (!getActiveRange()) {
+                return false;
+            }
+
+            var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
+
+            if (nodes.length == 0) {
+                return commands[command].inlineCommandActivatedValues
+                    .indexOf(getEffectiveCommandValue(getActiveRange().startContainer, command)) != -1;
+            } else {
+                return nodes.every(function(node) {
+                    return commands[command].inlineCommandActivatedValues
+                        .indexOf(getEffectiveCommandValue(node, command)) != -1;
+                });
+            }
+        };
+    }
+
+    // "If a command is a standard inline value command, it is indeterminate if
+    // among formattable nodes that are effectively contained in the active
+    // range, there are two that have distinct effective command values. Its
+    // value is the effective command value of the first formattable node that
+    // is effectively contained in the active range; or if there is no such
+    // node, the effective command value of the active range's start node; or
+    // if that is null, the empty string."
+    if ("standardInlineValueCommand" in commands[command]) {
+        commands[command].indeterm = function() {
+            if (!getActiveRange()) {
+                return false;
+            }
+
+            var values = getAllEffectivelyContainedNodes(getActiveRange())
+                .filter(isFormattableNode)
+                .map(function(node) { return getEffectiveCommandValue(node, command) });
+            for (var i = 1; i < values.length; i++) {
+                if (values[i] != values[i - 1]) {
+                    return true;
+                }
+            }
+            return false;
+        };
+
+        commands[command].value = function() {
+            if (!getActiveRange()) {
+                return "";
+            }
+
+            var refNode = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)[0];
+
+            if (typeof refNode == "undefined") {
+                refNode = getActiveRange().startContainer;
+            }
+
+            var ret = getEffectiveCommandValue(refNode, command);
+            if (ret === null) {
+                return "";
+            }
+            return ret;
+        };
+    }
+
+    // "If a command preserves overrides, then before taking its action, the
+    // user agent must record current overrides. After taking the action, if
+    // the active range is collapsed, it must restore states and values from
+    // the recorded list."
+    if ("preservesOverrides" in commands[command]) {
+        var oldAction = commands[command].action;
+
+        commands[command].action = function(value) {
+            var overrides = recordCurrentOverrides();
+            var ret = oldAction(value);
+            if (getActiveRange().collapsed) {
+                restoreStatesAndValues(overrides);
+            }
+            return ret;
+        };
+    }
+});
+})();
+//@}
+
+// vim: foldmarker=@{,@} foldmethod=marker