Specs: Split apis.md into dom.md, events.md, idl.md, and move the remainder into README.md and modu…

sky/specs/dom.md

+Sky DOM APIs
+============
+
+```javascript
+
+// DOM
+
+typedef ChildNode (Element or Text);
+typedef ChildArgument (Element or Text or String);
+
+abstract class Node : EventTarget { // implemented in C++
+  readonly attribute TreeScope? ownerScope; // O(1)
+
+  readonly attribute ParentNode? parentNode; // O(1)
+  readonly attribute Element? parentElement; // O(1) // if parentNode isn't an element, returns null
+  readonly attribute ChildNode? previousSibling; // O(1)
+  readonly attribute ChildNode? nextSibling; // O(1)
+
+  virtual Array<EventTarget> getEventDispatchChain(); // O(N) in number of ancestors across shadow trees // implements EventTarget.getEventDispatchChain()
+    // returns the event dispatch chain (including handling shadow trees)
+
+  // the following all throw if parentNode is null
+  void insertBefore(ChildArgument... nodes); // O(N) in number of arguments plus all their descendants
+  void insertAfter(ChildArgument... nodes); // O(N) in number of arguments plus all their descendants
+  void replaceWith(ChildArgument... nodes); // O(N) in number of descendants plus arguments plus all their descendants
+  void remove(); // O(N) in number of descendants
+  Node cloneNode(Boolean deep = false); // O(1) if deep=false, O(N) in the number of descendants if deep=true
+
+  // called when parentNode changes
+  virtual void parentChangeCallback(ParentNode? oldParent, ParentNode? newParent, ChildNode? previousSibling, ChildNode? nextSibling); // O(N) in descendants (calls attached/detached)
+  virtual void attachedCallback(); // noop
+  virtual void detachedCallback(); // noop
+}
+
+abstract class ParentNode : Node {
+  readonly attribute ChildNode? firstChild; // O(1)
+  readonly attribute ChildNode? lastChild; // O(1)
+
+  // Returns a new Array every time.
+  Array<ChildNode> getChildNodes(); // O(N) in number of child nodes
+  Array<Element> getChildElements(); // O(N) in number of child nodes // TODO(ianh): might not be necessary if we have the parser drop unnecessary whitespace text nodes
+
+  void append(ChildArgument... nodes); // O(N) in number of arguments plus all their descendants
+  void prepend(ChildArgument... nodes); // O(N) in number of arguments plus all their descendants
+  void replaceChildrenWith(ChildArgument... nodes); // O(N) in number of descendants plus arguments plus all their descendants
+}
+
+class Attr {
+  constructor (String name, String value = ''); // O(1)
+  readonly attribute String name; // O(1)
+  readonly attribute String value; // O(1)
+}
+
+abstract class Element : ParentNode {
+  readonly attribute String tagName; // O(1)
+
+  Boolean hasAttribute(String name); // O(N) in number of attributes
+  String getAttribute(String name); // O(N) in number of attributes
+  void setAttribute(String name, String value = ''); // O(N) in number of attributes
+  void removeAttribute(String name); // O(N) in number of attributes
+
+  // Returns a new Array and new Attr instances every time.
+  Array<Attr> getAttributes(); // O(N) in number of attributes
+
+  readonly attribute ShadowRoot? shadowRoot; // O(1) // returns the shadow root
+  Array<ContentElement> getDestinationInsertionPoints(); // O(N) in number of insertion points the node is in
+
+  virtual void endTagParsedCallback(); // noop
+  virtual void attributeChangeCallback(String name, String? oldValue, String? newValue); // noop
+  // TODO(ianh): does a node ever need to know when it's been redistributed?
+
+  readonly attribute ElementStyleDeclarationList style; // O(1)
+  readonly attribute RenderNode? renderNode; // O(1)
+    // this will be null until the first time it is rendered
+  virtual LayoutManagerConstructor getLayoutManager(); // O(1)
+    // default implementation looks up the 'display' property and returns the value:
+    //   if (renderNode)
+    //     return renderNode.getProperty(phDisplay);
+    //   return null;
+  void resetLayoutManager(); // O(1)
+    // if renderNode is non-null:
+    //   sets renderNode.layoutManager to null
+    //   sets renderNode.needsManager to true
+}
+
+class Text : Node {
+  constructor (String value = ''); // O(1)
+  attribute String value; // O(1)
+
+  void replaceWith(String node); // O(1) // special case override of Node.replaceWith()
+
+  virtual void valueChangeCallback(String? oldValue, String? newValue); // noop
+}
+
+class DocumentFragment : ParentNode {
+  constructor (ChildArguments... nodes); // O(N) in number of arguments plus all their descendants
+}
+
+abstract class TreeScope : ParentNode {
+  readonly attribute Document? ownerDocument; // O(1)
+  readonly attribute TreeScope? parentScope; // O(1)
+
+  Element? findId(String id); // O(1)
+}
+
+class ShadowRoot : TreeScope {
+  constructor (Element host); // O(1) // note that there is no way in the API to use a newly created ShadowRoot
+  readonly attribute Element host; // O(1)
+}
+
+class Document : TreeScope {
+  constructor (ChildArguments... nodes); // O(N) in number of arguments plus all their descendants
+}
+
+class SelectorQuery {
+  constructor (String selector); // O(F()) where F() is the complexity of the selector
+
+  Boolean matches(Element element); // O(F())
+  Element? find(Element root); // O(N*F())+O(M) where N is the number of descendants and M the average depth of the tree
+  Element? find(DocumentFragment root); // O(N*F())+O(M) where N is the number of descendants and M the average depth of the tree
+  Element? find(TreeScope root); // O(N*F()) where N is the number of descendants
+  Array<Element> findAll(Element root); // O(N*F())+O(N*M) where N is the number of descendants and M the average depth of the tree
+  Array<Element> findAll(DocumentFragment root); // O(N*F())+O(N*M) where N is the number of descendants and M the average depth of the tree
+  Array<Element> findAll(TreeScope root); // O(N*F()) where N is the number of descendants
+}
+
+
+// BUILT-IN ELEMENTS
+
+class ImportElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "import"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class TemplateElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "template"
+  constructor attribute Boolean shadow; // O(1) // false
+
+  readonly attribute DocumentFragment content; // O(1)
+}
+class ScriptElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "script"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class StyleElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "style"
+  constructor attribute Boolean shadow; // O(1) // false
+
+  Array<Rule> getRules(); // O(N) in rules
+}
+class ContentElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "content"
+  constructor attribute Boolean shadow; // O(1) // false
+
+  Array<Node> getDistributedNodes(); // O(N) in distributed nodes
+}
+class ImgElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "img"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class DivElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "div"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class SpanElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "span"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class IframeElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "iframe"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class TElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "t"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class AElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "a"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class TitleElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "title"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+class ErrorElement : Element {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+  constructor attribute String tagName; // O(1) // "error"
+  constructor attribute Boolean shadow; // O(1) // false
+}
+
+callback InternalElementConstructor void (Module module);
+dictionary ElementRegistration {
+  String tagName;
+  Boolean shadow = false;
+  InternalElementConstructor? constructor = null;
+}
+
+interface ElementConstructor {
+  constructor (Dictionary<String> attributes, ChildArguments... nodes); // O(M+N), M = number of attributes, N = number of nodes plus all their descendants
+  constructor (ChildArguments... nodes); // shorthand
+  constructor (Dictionary<String> attributes); // shorthand
+  constructor (); // shorthand
+
+  constructor attribute String tagName;
+  constructor attribute Boolean shadow;
+}
+```