Importing dromaeo performance tests to src/chrome/test/data....

chrome/test/data/dromaeo/lib/yui-dom.js

Index: chrome/test/data/dromaeo/lib/yui-dom.js
===================================================================
--- chrome/test/data/dromaeo/lib/yui-dom.js	(revision 0)
+++ chrome/test/data/dromaeo/lib/yui-dom.js	(revision 0)
@@ -0,0 +1,1241 @@
+/*
+Copyright (c) 2008, Yahoo! Inc. All rights reserved.
+Code licensed under the BSD License:
+http://developer.yahoo.net/yui/license.txt
+version: 2.6.0
+*/
+/**
+ * The dom module provides helper methods for manipulating Dom elements.
+ * @module dom
+ *
+ */
+
+(function() {
+    var Y = YAHOO.util,     // internal shorthand
+        lang = YAHOO.lang,
+        getStyle,           // for load time browser branching
+        setStyle,           // ditto
+        propertyCache = {}, // for faster hyphen converts
+        reClassNameCache = {},          // cache regexes for className
+        document = window.document;     // cache for faster lookups
+    
+    YAHOO.env._id_counter = YAHOO.env._id_counter || 0;     // for use with generateId (global to save state if Dom is overwritten)
+
+    // brower detection
+    var isOpera = YAHOO.env.ua.opera,
+        isSafari = YAHOO.env.ua.webkit, 
+        isGecko = YAHOO.env.ua.gecko,
+        isIE = YAHOO.env.ua.ie; 
+    
+    // regex cache
+    var patterns = {
+        HYPHEN: /(-[a-z])/i, // to normalize get/setStyle
+        ROOT_TAG: /^body|html$/i, // body for quirks mode, html for standards,
+        OP_SCROLL:/^(?:inline|table-row)$/i
+    };
+
+    var toCamel = function(property) {
+        if ( !patterns.HYPHEN.test(property) ) {
+            return property; // no hyphens
+        }
+        
+        if (propertyCache[property]) { // already converted
+            return propertyCache[property];
+        }
+       
+        var converted = property;
+ 
+        while( patterns.HYPHEN.exec(converted) ) {
+            converted = converted.replace(RegExp.$1,
+                    RegExp.$1.substr(1).toUpperCase());
+        }
+        
+        propertyCache[property] = converted;
+        return converted;
+        //return property.replace(/-([a-z])/gi, function(m0, m1) {return m1.toUpperCase()}) // cant use function as 2nd arg yet due to safari bug
+    };
+    
+    var getClassRegEx = function(className) {
+        var re = reClassNameCache[className];
+        if (!re) {
+            re = new RegExp('(?:^|\\s+)' + className + '(?:\\s+|$)');
+            reClassNameCache[className] = re;
+        }
+        return re;
+    };
+
+    // branching at load instead of runtime
+    if (document.defaultView && document.defaultView.getComputedStyle) { // W3C DOM method
+        getStyle = function(el, property) {
+            var value = null;
+            
+            if (property == 'float') { // fix reserved word
+                property = 'cssFloat';
+            }
+
+            var computed = el.ownerDocument.defaultView.getComputedStyle(el, '');
+            if (computed) { // test computed before touching for safari
+                value = computed[toCamel(property)];
+            }
+            
+            return el.style[property] || value;
+        };
+    } else if (document.documentElement.currentStyle && isIE) { // IE method
+        getStyle = function(el, property) {                         
+            switch( toCamel(property) ) {
+                case 'opacity' :// IE opacity uses filter
+                    var val = 100;
+                    try { // will error if no DXImageTransform
+                        val = el.filters['DXImageTransform.Microsoft.Alpha'].opacity;
+
+                    } catch(e) {
+                        try { // make sure its in the document
+                            val = el.filters('alpha').opacity;
+                        } catch(e) {
+                        }
+                    }
+                    return val / 100;
+                case 'float': // fix reserved word
+                    property = 'styleFloat'; // fall through
+                default: 
+                    // test currentStyle before touching
+                    var value = el.currentStyle ? el.currentStyle[property] : null;
+                    return ( el.style[property] || value );
+            }
+        };
+    } else { // default to inline only
+        getStyle = function(el, property) { return el.style[property]; };
+    }
+    
+    if (isIE) {
+        setStyle = function(el, property, val) {
+            switch (property) {
+                case 'opacity':
+                    if ( lang.isString(el.style.filter) ) { // in case not appended
+                        el.style.filter = 'alpha(opacity=' + val * 100 + ')';
+                        
+                        if (!el.currentStyle || !el.currentStyle.hasLayout) {
+                            el.style.zoom = 1; // when no layout or cant tell
+                        }
+                    }
+                    break;
+                case 'float':
+                    property = 'styleFloat';
+                default:
+                el.style[property] = val;
+            }
+        };
+    } else {
+        setStyle = function(el, property, val) {
+            if (property == 'float') {
+                property = 'cssFloat';
+            }
+            el.style[property] = val;
+        };
+    }
+
+    var testElement = function(node, method) {
+        return node && node.nodeType == 1 && ( !method || method(node) );
+    };
+
+    /**
+     * Provides helper methods for DOM elements.
+     * @namespace YAHOO.util
+     * @class Dom
+     */
+    YAHOO.util.Dom = {
+        /**
+         * Returns an HTMLElement reference.
+         * @method get
+         * @param {String | HTMLElement |Array} el Accepts a string to use as an ID for getting a DOM reference, an actual DOM reference, or an Array of IDs and/or HTMLElements.
+         * @return {HTMLElement | Array} A DOM reference to an HTML element or an array of HTMLElements.
+         */
+        get: function(el) {
+            if (el) {
+                if (el.nodeType || el.item) { // Node, or NodeList
+                    return el;
+                }
+
+                if (typeof el === 'string') { // id
+                    return document.getElementById(el);
+                }
+                
+                if ('length' in el) { // array-like 
+                    var c = [];
+                    for (var i = 0, len = el.length; i < len; ++i) {
+                        c[c.length] = Y.Dom.get(el[i]);
+                    }
+                    
+                    return c;
+                }
+
+                return el; // some other object, just pass it back
+            }
+
+            return null;
+        },
+    
+        /**
+         * Normalizes currentStyle and ComputedStyle.
+         * @method getStyle
+         * @param {String | HTMLElement |Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
+         * @param {String} property The style property whose value is returned.
+         * @return {String | Array} The current value of the style property for the element(s).
+         */
+        getStyle: function(el, property) {
+            property = toCamel(property);
+            
+            var f = function(element) {
+                return getStyle(element, property);
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+    
+        /**
+         * Wrapper for setting style properties of HTMLElements.  Normalizes "opacity" across modern browsers.
+         * @method setStyle
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
+         * @param {String} property The style property to be set.
+         * @param {String} val The value to apply to the given property.
+         */
+        setStyle: function(el, property, val) {
+            property = toCamel(property);
+            
+            var f = function(element) {
+                setStyle(element, property, val);
+                
+            };
+            
+            Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Gets the current position of an element based on page coordinates.  Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+         * @method getXY
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
+         * @return {Array} The XY position of the element(s)
+         */
+        getXY: function(el) {
+            var f = function(el) {
+                // has to be part of document to have pageXY
+                if ( (el.parentNode === null || el.offsetParent === null ||
+                        this.getStyle(el, 'display') == 'none') && el != el.ownerDocument.body) {
+                    return false;
+                }
+                
+                return getXY(el);
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Gets the current X position of an element based on page coordinates.  The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+         * @method getX
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
+         * @return {Number | Array} The X position of the element(s)
+         */
+        getX: function(el) {
+            var f = function(el) {
+                return Y.Dom.getXY(el)[0];
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Gets the current Y position of an element based on page coordinates.  Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+         * @method getY
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
+         * @return {Number | Array} The Y position of the element(s)
+         */
+        getY: function(el) {
+            var f = function(el) {
+                return Y.Dom.getXY(el)[1];
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Set the position of an html element in page coordinates, regardless of how the element is positioned.
+         * The element(s) must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+         * @method setXY
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
+         * @param {Array} pos Contains X & Y values for new position (coordinates are page-based)
+         * @param {Boolean} noRetry By default we try and set the position a second time if the first fails
+         */
+        setXY: function(el, pos, noRetry) {
+            var f = function(el) {
+                var style_pos = this.getStyle(el, 'position');
+                if (style_pos == 'static') { // default to relative
+                    this.setStyle(el, 'position', 'relative');
+                    style_pos = 'relative';
+                }
+
+                var pageXY = this.getXY(el);
+                if (pageXY === false) { // has to be part of doc to have pageXY
+                    return false; 
+                }
+                
+                var delta = [ // assuming pixels; if not we will have to retry
+                    parseInt( this.getStyle(el, 'left'), 10 ),
+                    parseInt( this.getStyle(el, 'top'), 10 )
+                ];
+            
+                if ( isNaN(delta[0]) ) {// in case of 'auto'
+                    delta[0] = (style_pos == 'relative') ? 0 : el.offsetLeft;
+                } 
+                if ( isNaN(delta[1]) ) { // in case of 'auto'
+                    delta[1] = (style_pos == 'relative') ? 0 : el.offsetTop;
+                } 
+        
+                if (pos[0] !== null) { el.style.left = pos[0] - pageXY[0] + delta[0] + 'px'; }
+                if (pos[1] !== null) { el.style.top = pos[1] - pageXY[1] + delta[1] + 'px'; }
+              
+                if (!noRetry) {
+                    var newXY = this.getXY(el);
+
+                    // if retry is true, try one more time if we miss 
+                   if ( (pos[0] !== null && newXY[0] != pos[0]) || 
+                        (pos[1] !== null && newXY[1] != pos[1]) ) {
+                       this.setXY(el, pos, true);
+                   }
+                }        
+        
+            };
+            
+            Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Set the X position of an html element in page coordinates, regardless of how the element is positioned.
+         * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+         * @method setX
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
+         * @param {Int} x The value to use as the X coordinate for the element(s).
+         */
+        setX: function(el, x) {
+            Y.Dom.setXY(el, [x, null]);
+        },
+        
+        /**
+         * Set the Y position of an html element in page coordinates, regardless of how the element is positioned.
+         * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+         * @method setY
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
+         * @param {Int} x To use as the Y coordinate for the element(s).
+         */
+        setY: function(el, y) {
+            Y.Dom.setXY(el, [null, y]);
+        },
+        
+        /**
+         * Returns the region position of the given element.
+         * The element must be part of the DOM tree to have a region (display:none or elements not appended return false).
+         * @method getRegion
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
+         * @return {Region | Array} A Region or array of Region instances containing "top, left, bottom, right" member data.
+         */
+        getRegion: function(el) {
+            var f = function(el) {
+                if ( (el.parentNode === null || el.offsetParent === null ||
+                        this.getStyle(el, 'display') == 'none') && el != el.ownerDocument.body) {
+                    return false;
+                }
+
+                var region = Y.Region.getRegion(el);
+                return region;
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Returns the width of the client (viewport).
+         * @method getClientWidth
+         * @deprecated Now using getViewportWidth.  This interface left intact for back compat.
+         * @return {Int} The width of the viewable area of the page.
+         */
+        getClientWidth: function() {
+            return Y.Dom.getViewportWidth();
+        },
+        
+        /**
+         * Returns the height of the client (viewport).
+         * @method getClientHeight
+         * @deprecated Now using getViewportHeight.  This interface left intact for back compat.
+         * @return {Int} The height of the viewable area of the page.
+         */
+        getClientHeight: function() {
+            return Y.Dom.getViewportHeight();
+        },
+
+        /**
+         * Returns a array of HTMLElements with the given class.
+         * For optimized performance, include a tag and/or root node when possible.
+         * Note: This method operates against a live collection, so modifying the 
+         * collection in the callback (removing/appending nodes, etc.) will have
+         * side effects.  Instead you should iterate the returned nodes array,
+         * as you would with the native "getElementsByTagName" method. 
+         * @method getElementsByClassName
+         * @param {String} className The class name to match against
+         * @param {String} tag (optional) The tag name of the elements being collected
+         * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point 
+         * @param {Function} apply (optional) A function to apply to each element when found 
+         * @return {Array} An array of elements that have the given class name
+         */
+        getElementsByClassName: function(className, tag, root, apply) {
+            className = lang.trim(className);
+            tag = tag || '*';
+            root = (root) ? Y.Dom.get(root) : null || document; 
+            if (!root) {
+                return [];
+            }
+
+            var nodes = [],
+                elements = root.getElementsByTagName(tag),
+                re = getClassRegEx(className);
+
+            for (var i = 0, len = elements.length; i < len; ++i) {
+                if ( re.test(elements[i].className) ) {
+                    nodes[nodes.length] = elements[i];
+                    if (apply) {
+                        apply.call(elements[i], elements[i]);
+                    }
+                }
+            }
+            
+            return nodes;
+        },
+
+        /**
+         * Determines whether an HTMLElement has the given className.
+         * @method hasClass
+         * @param {String | HTMLElement | Array} el The element or collection to test
+         * @param {String} className the class name to search for
+         * @return {Boolean | Array} A boolean value or array of boolean values
+         */
+        hasClass: function(el, className) {
+            var re = getClassRegEx(className);
+
+            var f = function(el) {
+                return re.test(el.className);
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+    
+        /**
+         * Adds a class name to a given element or collection of elements.
+         * @method addClass         
+         * @param {String | HTMLElement | Array} el The element or collection to add the class to
+         * @param {String} className the class name to add to the class attribute
+         * @return {Boolean | Array} A pass/fail boolean or array of booleans
+         */
+        addClass: function(el, className) {
+            var f = function(el) {
+                if (this.hasClass(el, className)) {
+                    return false; // already present
+                }
+                
+                
+                el.className = lang.trim([el.className, className].join(' '));
+                return true;
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+    
+        /**
+         * Removes a class name from a given element or collection of elements.
+         * @method removeClass         
+         * @param {String | HTMLElement | Array} el The element or collection to remove the class from
+         * @param {String} className the class name to remove from the class attribute
+         * @return {Boolean | Array} A pass/fail boolean or array of booleans
+         */
+        removeClass: function(el, className) {
+            var re = getClassRegEx(className);
+            
+            var f = function(el) {
+                var ret = false,
+                    current = el.className;
+
+                if (className && current && this.hasClass(el, className)) {
+                    
+                    el.className = current.replace(re, ' ');
+                    if ( this.hasClass(el, className) ) { // in case of multiple adjacent
+                        this.removeClass(el, className);
+                    }
+
+                    el.className = lang.trim(el.className); // remove any trailing spaces
+                    if (el.className === '') { // remove class attribute if empty
+                        var attr = (el.hasAttribute) ? 'class' : 'className';
+                        el.removeAttribute(attr);
+                    }
+                    ret = true;
+                }                 
+                return ret;
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Replace a class with another class for a given element or collection of elements.
+         * If no oldClassName is present, the newClassName is simply added.
+         * @method replaceClass  
+         * @param {String | HTMLElement | Array} el The element or collection to remove the class from
+         * @param {String} oldClassName the class name to be replaced
+         * @param {String} newClassName the class name that will be replacing the old class name
+         * @return {Boolean | Array} A pass/fail boolean or array of booleans
+         */
+        replaceClass: function(el, oldClassName, newClassName) {
+            if (!newClassName || oldClassName === newClassName) { // avoid infinite loop
+                return false;
+            }
+            
+            var re = getClassRegEx(oldClassName);
+
+            var f = function(el) {
+            
+                if ( !this.hasClass(el, oldClassName) ) {
+                    this.addClass(el, newClassName); // just add it if nothing to replace
+                    return true; // NOTE: return
+                }
+            
+                el.className = el.className.replace(re, ' ' + newClassName + ' ');
+
+                if ( this.hasClass(el, oldClassName) ) { // in case of multiple adjacent
+                    this.removeClass(el, oldClassName);
+                }
+
+                el.className = lang.trim(el.className); // remove any trailing spaces
+                return true;
+            };
+            
+            return Y.Dom.batch(el, f, Y.Dom, true);
+        },
+        
+        /**
+         * Returns an ID and applies it to the element "el", if provided.
+         * @method generateId  
+         * @param {String | HTMLElement | Array} el (optional) An optional element array of elements to add an ID to (no ID is added if one is already present).
+         * @param {String} prefix (optional) an optional prefix to use (defaults to "yui-gen").
+         * @return {String | Array} The generated ID, or array of generated IDs (or original ID if already present on an element)
+         */
+        generateId: function(el, prefix) {
+            prefix = prefix || 'yui-gen';
+
+            var f = function(el) {
+                if (el && el.id) { // do not override existing ID
+                    return el.id;
+                } 
+
+                var id = prefix + YAHOO.env._id_counter++;
+
+                if (el) {
+                    el.id = id;
+                }
+                
+                return id;
+            };
+
+            // batch fails when no element, so just generate and return single ID
+            return Y.Dom.batch(el, f, Y.Dom, true) || f.apply(Y.Dom, arguments);
+        },
+        
+        /**
+         * Determines whether an HTMLElement is an ancestor of another HTML element in the DOM hierarchy.
+         * @method isAncestor
+         * @param {String | HTMLElement} haystack The possible ancestor
+         * @param {String | HTMLElement} needle The possible descendent
+         * @return {Boolean} Whether or not the haystack is an ancestor of needle
+         */
+        isAncestor: function(haystack, needle) {
+            haystack = Y.Dom.get(haystack);
+            needle = Y.Dom.get(needle);
+            
+            var ret = false;
+
+            if ( (haystack && needle) && (haystack.nodeType && needle.nodeType) ) {
+                if (haystack.contains && haystack !== needle) { // contains returns true when equal
+                    ret = haystack.contains(needle);
+                }
+                else if (haystack.compareDocumentPosition) { // gecko
+                    ret = !!(haystack.compareDocumentPosition(needle) & 16);
+                }
+            } else {
+            }
+            return ret;
+        },
+        
+        /**
+         * Determines whether an HTMLElement is present in the current document.
+         * @method inDocument         
+         * @param {String | HTMLElement} el The element to search for
+         * @return {Boolean} Whether or not the element is present in the current document
+         */
+        inDocument: function(el) {
+            return this.isAncestor(document.documentElement, el);
+        },
+        
+        /**
+         * Returns a array of HTMLElements that pass the test applied by supplied boolean method.
+         * For optimized performance, include a tag and/or root node when possible.
+         * Note: This method operates against a live collection, so modifying the 
+         * collection in the callback (removing/appending nodes, etc.) will have
+         * side effects.  Instead you should iterate the returned nodes array,
+         * as you would with the native "getElementsByTagName" method. 
+         * @method getElementsBy
+         * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
+         * @param {String} tag (optional) The tag name of the elements being collected
+         * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point 
+         * @param {Function} apply (optional) A function to apply to each element when found 
+         * @return {Array} Array of HTMLElements
+         */
+        getElementsBy: function(method, tag, root, apply) {
+            tag = tag || '*';
+            root = (root) ? Y.Dom.get(root) : null || document; 
+
+            if (!root) {
+                return [];
+            }
+
+            var nodes = [],
+                elements = root.getElementsByTagName(tag);
+            
+            for (var i = 0, len = elements.length; i < len; ++i) {
+                if ( method(elements[i]) ) {
+                    nodes[nodes.length] = elements[i];
+                    if (apply) {
+                        apply(elements[i]);
+                    }
+                }
+            }
+
+            
+            return nodes;
+        },
+        
+        /**
+         * Runs the supplied method against each item in the Collection/Array.
+         * The method is called with the element(s) as the first arg, and the optional param as the second ( method(el, o) ).
+         * @method batch
+         * @param {String | HTMLElement | Array} el (optional) An element or array of elements to apply the method to
+         * @param {Function} method The method to apply to the element(s)
+         * @param {Any} o (optional) An optional arg that is passed to the supplied method
+         * @param {Boolean} override (optional) Whether or not to override the scope of "method" with "o"
+         * @return {Any | Array} The return value(s) from the supplied method
+         */
+        batch: function(el, method, o, override) {
+            el = (el && (el.tagName || el.item)) ? el : Y.Dom.get(el); // skip get() when possible
+
+            if (!el || !method) {
+                return false;
+            } 
+            var scope = (override) ? o : window;
+            
+            if (el.tagName || el.length === undefined) { // element or not array-like 
+                return method.call(scope, el, o);
+            } 
+
+            var collection = [];
+            
+            for (var i = 0, len = el.length; i < len; ++i) {
+                collection[collection.length] = method.call(scope, el[i], o);
+            }
+            
+            return collection;
+        },
+        
+        /**
+         * Returns the height of the document.
+         * @method getDocumentHeight
+         * @return {Int} The height of the actual document (which includes the body and its margin).
+         */
+        getDocumentHeight: function() {
+            var scrollHeight = (document.compatMode != 'CSS1Compat') ? document.body.scrollHeight : document.documentElement.scrollHeight;
+
+            var h = Math.max(scrollHeight, Y.Dom.getViewportHeight());
+            return h;
+        },
+        
+        /**
+         * Returns the width of the document.
+         * @method getDocumentWidth
+         * @return {Int} The width of the actual document (which includes the body and its margin).
+         */
+        getDocumentWidth: function() {
+            var scrollWidth = (document.compatMode != 'CSS1Compat') ? document.body.scrollWidth : document.documentElement.scrollWidth;
+            var w = Math.max(scrollWidth, Y.Dom.getViewportWidth());
+            return w;
+        },
+
+        /**
+         * Returns the current height of the viewport.
+         * @method getViewportHeight
+         * @return {Int} The height of the viewable area of the page (excludes scrollbars).
+         */
+        getViewportHeight: function() {
+            var height = self.innerHeight; // Safari, Opera
+            var mode = document.compatMode;
+        
+            if ( (mode || isIE) && !isOpera ) { // IE, Gecko
+                height = (mode == 'CSS1Compat') ?
+                        document.documentElement.clientHeight : // Standards
+                        document.body.clientHeight; // Quirks
+            }
+        
+            return height;
+        },
+        
+        /**
+         * Returns the current width of the viewport.
+         * @method getViewportWidth
+         * @return {Int} The width of the viewable area of the page (excludes scrollbars).
+         */
+        
+        getViewportWidth: function() {
+            var width = self.innerWidth;  // Safari
+            var mode = document.compatMode;
+            
+            if (mode || isIE) { // IE, Gecko, Opera
+                width = (mode == 'CSS1Compat') ?
+                        document.documentElement.clientWidth : // Standards
+                        document.body.clientWidth; // Quirks
+            }
+            return width;
+        },
+
+       /**
+         * Returns the nearest ancestor that passes the test applied by supplied boolean method.
+         * For performance reasons, IDs are not accepted and argument validation omitted.
+         * @method getAncestorBy
+         * @param {HTMLElement} node The HTMLElement to use as the starting point 
+         * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
+         * @return {Object} HTMLElement or null if not found
+         */
+        getAncestorBy: function(node, method) {
+            while ( (node = node.parentNode) ) { // NOTE: assignment
+                if ( testElement(node, method) ) {
+                    return node;
+                }
+            } 
+
+            return null;
+        },
+        
+        /**
+         * Returns the nearest ancestor with the given className.
+         * @method getAncestorByClassName
+         * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
+         * @param {String} className
+         * @return {Object} HTMLElement
+         */
+        getAncestorByClassName: function(node, className) {
+            node = Y.Dom.get(node);
+            if (!node) {
+                return null;
+            }
+            var method = function(el) { return Y.Dom.hasClass(el, className); };
+            return Y.Dom.getAncestorBy(node, method);
+        },
+
+        /**
+         * Returns the nearest ancestor with the given tagName.
+         * @method getAncestorByTagName
+         * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
+         * @param {String} tagName
+         * @return {Object} HTMLElement
+         */
+        getAncestorByTagName: function(node, tagName) {
+            node = Y.Dom.get(node);
+            if (!node) {
+                return null;
+            }
+            var method = function(el) {
+                 return el.tagName && el.tagName.toUpperCase() == tagName.toUpperCase();
+            };
+
+            return Y.Dom.getAncestorBy(node, method);
+        },
+
+        /**
+         * Returns the previous sibling that is an HTMLElement. 
+         * For performance reasons, IDs are not accepted and argument validation omitted.
+         * Returns the nearest HTMLElement sibling if no method provided.
+         * @method getPreviousSiblingBy
+         * @param {HTMLElement} node The HTMLElement to use as the starting point 
+         * @param {Function} method A boolean function used to test siblings
+         * that receives the sibling node being tested as its only argument
+         * @return {Object} HTMLElement or null if not found
+         */
+        getPreviousSiblingBy: function(node, method) {
+            while (node) {
+                node = node.previousSibling;
+                if ( testElement(node, method) ) {
+                    return node;
+                }
+            }
+            return null;
+        }, 
+
+        /**
+         * Returns the previous sibling that is an HTMLElement 
+         * @method getPreviousSibling
+         * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
+         * @return {Object} HTMLElement or null if not found
+         */
+        getPreviousSibling: function(node) {
+            node = Y.Dom.get(node);
+            if (!node) {
+                return null;
+            }
+
+            return Y.Dom.getPreviousSiblingBy(node);
+        }, 
+
+        /**
+         * Returns the next HTMLElement sibling that passes the boolean method. 
+         * For performance reasons, IDs are not accepted and argument validation omitted.
+         * Returns the nearest HTMLElement sibling if no method provided.
+         * @method getNextSiblingBy
+         * @param {HTMLElement} node The HTMLElement to use as the starting point 
+         * @param {Function} method A boolean function used to test siblings
+         * that receives the sibling node being tested as its only argument
+         * @return {Object} HTMLElement or null if not found
+         */
+        getNextSiblingBy: function(node, method) {
+            while (node) {
+                node = node.nextSibling;
+                if ( testElement(node, method) ) {
+                    return node;
+                }
+            }
+            return null;
+        }, 
+
+        /**
+         * Returns the next sibling that is an HTMLElement 
+         * @method getNextSibling
+         * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
+         * @return {Object} HTMLElement or null if not found
+         */
+        getNextSibling: function(node) {
+            node = Y.Dom.get(node);
+            if (!node) {
+                return null;
+            }
+
+            return Y.Dom.getNextSiblingBy(node);
+        }, 
+
+        /**
+         * Returns the first HTMLElement child that passes the test method. 
+         * @method getFirstChildBy
+         * @param {HTMLElement} node The HTMLElement to use as the starting point 
+         * @param {Function} method A boolean function used to test children
+         * that receives the node being tested as its only argument
+         * @return {Object} HTMLElement or null if not found
+         */
+        getFirstChildBy: function(node, method) {
+            var child = ( testElement(node.firstChild, method) ) ? node.firstChild : null;
+            return child || Y.Dom.getNextSiblingBy(node.firstChild, method);
+        }, 
+
+        /**
+         * Returns the first HTMLElement child. 
+         * @method getFirstChild
+         * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
+         * @return {Object} HTMLElement or null if not found
+         */
+        getFirstChild: function(node, method) {
+            node = Y.Dom.get(node);
+            if (!node) {
+                return null;
+            }
+            return Y.Dom.getFirstChildBy(node);
+        }, 
+
+        /**
+         * Returns the last HTMLElement child that passes the test method. 
+         * @method getLastChildBy
+         * @param {HTMLElement} node The HTMLElement to use as the starting point 
+         * @param {Function} method A boolean function used to test children
+         * that receives the node being tested as its only argument
+         * @return {Object} HTMLElement or null if not found
+         */
+        getLastChildBy: function(node, method) {
+            if (!node) {
+                return null;
+            }
+            var child = ( testElement(node.lastChild, method) ) ? node.lastChild : null;
+            return child || Y.Dom.getPreviousSiblingBy(node.lastChild, method);
+        }, 
+
+        /**
+         * Returns the last HTMLElement child. 
+         * @method getLastChild
+         * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
+         * @return {Object} HTMLElement or null if not found
+         */
+        getLastChild: function(node) {
+            node = Y.Dom.get(node);
+            return Y.Dom.getLastChildBy(node);
+        }, 
+
+        /**
+         * Returns an array of HTMLElement childNodes that pass the test method. 
+         * @method getChildrenBy
+         * @param {HTMLElement} node The HTMLElement to start from
+         * @param {Function} method A boolean function used to test children
+         * that receives the node being tested as its only argument
+         * @return {Array} A static array of HTMLElements
+         */
+        getChildrenBy: function(node, method) {
+            var child = Y.Dom.getFirstChildBy(node, method);
+            var children = child ? [child] : [];
+
+            Y.Dom.getNextSiblingBy(child, function(node) {
+                if ( !method || method(node) ) {
+                    children[children.length] = node;
+                }
+                return false; // fail test to collect all children
+            });
+
+            return children;
+        },
+ 
+        /**
+         * Returns an array of HTMLElement childNodes. 
+         * @method getChildren
+         * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point 
+         * @return {Array} A static array of HTMLElements
+         */
+        getChildren: function(node) {
+            node = Y.Dom.get(node);
+            if (!node) {
+            }
+
+            return Y.Dom.getChildrenBy(node);
+        },
+ 
+        /**
+         * Returns the left scroll value of the document 
+         * @method getDocumentScrollLeft
+         * @param {HTMLDocument} document (optional) The document to get the scroll value of
+         * @return {Int}  The amount that the document is scrolled to the left
+         */
+        getDocumentScrollLeft: function(doc) {
+            doc = doc || document;
+            return Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft);
+        }, 
+
+        /**
+         * Returns the top scroll value of the document 
+         * @method getDocumentScrollTop
+         * @param {HTMLDocument} document (optional) The document to get the scroll value of
+         * @return {Int}  The amount that the document is scrolled to the top
+         */
+        getDocumentScrollTop: function(doc) {
+            doc = doc || document;
+            return Math.max(doc.documentElement.scrollTop, doc.body.scrollTop);
+        },
+
+        /**
+         * Inserts the new node as the previous sibling of the reference node 
+         * @method insertBefore
+         * @param {String | HTMLElement} newNode The node to be inserted
+         * @param {String | HTMLElement} referenceNode The node to insert the new node before 
+         * @return {HTMLElement} The node that was inserted (or null if insert fails) 
+         */
+        insertBefore: function(newNode, referenceNode) {
+            newNode = Y.Dom.get(newNode); 
+            referenceNode = Y.Dom.get(referenceNode); 
+            
+            if (!newNode || !referenceNode || !referenceNode.parentNode) {
+                return null;
+            }       
+
+            return referenceNode.parentNode.insertBefore(newNode, referenceNode); 
+        },
+
+        /**
+         * Inserts the new node as the next sibling of the reference node 
+         * @method insertAfter
+         * @param {String | HTMLElement} newNode The node to be inserted
+         * @param {String | HTMLElement} referenceNode The node to insert the new node after 
+         * @return {HTMLElement} The node that was inserted (or null if insert fails) 
+         */
+        insertAfter: function(newNode, referenceNode) {
+            newNode = Y.Dom.get(newNode); 
+            referenceNode = Y.Dom.get(referenceNode); 
+            
+            if (!newNode || !referenceNode || !referenceNode.parentNode) {
+                return null;
+            }       
+
+            if (referenceNode.nextSibling) {
+                return referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling); 
+            } else {
+                return referenceNode.parentNode.appendChild(newNode);
+            }
+        },
+
+        /**
+         * Creates a Region based on the viewport relative to the document. 
+         * @method getClientRegion
+         * @return {Region} A Region object representing the viewport which accounts for document scroll
+         */
+        getClientRegion: function() {
+            var t = Y.Dom.getDocumentScrollTop(),
+                l = Y.Dom.getDocumentScrollLeft(),
+                r = Y.Dom.getViewportWidth() + l,
+                b = Y.Dom.getViewportHeight() + t;
+
+            return new Y.Region(t, r, b, l);
+        }
+    };
+    
+    var getXY = function() {
+        if (document.documentElement.getBoundingClientRect) { // IE
+            return function(el) {
+                var box = el.getBoundingClientRect(),
+                    round = Math.round;
+
+                var rootNode = el.ownerDocument;
+                return [round(box.left + Y.Dom.getDocumentScrollLeft(rootNode)), round(box.top +
+                        Y.Dom.getDocumentScrollTop(rootNode))];
+            };
+        } else {
+            return function(el) { // manually calculate by crawling up offsetParents
+                var pos = [el.offsetLeft, el.offsetTop];
+                var parentNode = el.offsetParent;
+
+                // safari: subtract body offsets if el is abs (or any offsetParent), unless body is offsetParent
+                var accountForBody = (isSafari &&
+                        Y.Dom.getStyle(el, 'position') == 'absolute' &&
+                        el.offsetParent == el.ownerDocument.body);
+
+                if (parentNode != el) {
+                    while (parentNode) {
+                        pos[0] += parentNode.offsetLeft;
+                        pos[1] += parentNode.offsetTop;
+                        if (!accountForBody && isSafari && 
+                                Y.Dom.getStyle(parentNode,'position') == 'absolute' ) { 
+                            accountForBody = true;
+                        }
+                        parentNode = parentNode.offsetParent;
+                    }
+                }
+
+                if (accountForBody) { //safari doubles in this case
+                    pos[0] -= el.ownerDocument.body.offsetLeft;
+                    pos[1] -= el.ownerDocument.body.offsetTop;
+                } 
+                parentNode = el.parentNode;
+
+                // account for any scrolled ancestors
+                while ( parentNode.tagName && !patterns.ROOT_TAG.test(parentNode.tagName) ) 
+                {
+                    if (parentNode.scrollTop || parentNode.scrollLeft) {
+                        pos[0] -= parentNode.scrollLeft;
+                        pos[1] -= parentNode.scrollTop;
+                    }
+                    
+                    parentNode = parentNode.parentNode; 
+                }
+
+                return pos;
+            };
+        }
+    }() // NOTE: Executing for loadtime branching
+})();
+/**
+ * A region is a representation of an object on a grid.  It is defined
+ * by the top, right, bottom, left extents, so is rectangular by default.  If 
+ * other shapes are required, this class could be extended to support it.
+ * @namespace YAHOO.util
+ * @class Region
+ * @param {Int} t the top extent
+ * @param {Int} r the right extent
+ * @param {Int} b the bottom extent
+ * @param {Int} l the left extent
+ * @constructor
+ */
+YAHOO.util.Region = function(t, r, b, l) {
+
+    /**
+     * The region's top extent
+     * @property top
+     * @type Int
+     */
+    this.top = t;
+    
+    /**
+     * The region's top extent as index, for symmetry with set/getXY
+     * @property 1
+     * @type Int
+     */
+    this[1] = t;
+
+    /**
+     * The region's right extent
+     * @property right
+     * @type int
+     */
+    this.right = r;
+
+    /**
+     * The region's bottom extent
+     * @property bottom
+     * @type Int
+     */
+    this.bottom = b;
+
+    /**
+     * The region's left extent
+     * @property left
+     * @type Int
+     */
+    this.left = l;
+    
+    /**
+     * The region's left extent as index, for symmetry with set/getXY
+     * @property 0
+     * @type Int
+     */
+    this[0] = l;
+};
+
+/**
+ * Returns true if this region contains the region passed in
+ * @method contains
+ * @param  {Region}  region The region to evaluate
+ * @return {Boolean}        True if the region is contained with this region, 
+ *                          else false
+ */
+YAHOO.util.Region.prototype.contains = function(region) {
+    return ( region.left   >= this.left   && 
+             region.right  <= this.right  && 
+             region.top    >= this.top    && 
+             region.bottom <= this.bottom    );
+
+};
+
+/**
+ * Returns the area of the region
+ * @method getArea
+ * @return {Int} the region's area
+ */
+YAHOO.util.Region.prototype.getArea = function() {
+    return ( (this.bottom - this.top) * (this.right - this.left) );
+};
+
+/**
+ * Returns the region where the passed in region overlaps with this one
+ * @method intersect
+ * @param  {Region} region The region that intersects
+ * @return {Region}        The overlap region, or null if there is no overlap
+ */
+YAHOO.util.Region.prototype.intersect = function(region) {
+    var t = Math.max( this.top,    region.top    );
+    var r = Math.min( this.right,  region.right  );
+    var b = Math.min( this.bottom, region.bottom );
+    var l = Math.max( this.left,   region.left   );
+    
+    if (b >= t && r >= l) {
+        return new YAHOO.util.Region(t, r, b, l);
+    } else {
+        return null;
+    }
+};
+
+/**
+ * Returns the region representing the smallest region that can contain both
+ * the passed in region and this region.
+ * @method union
+ * @param  {Region} region The region that to create the union with
+ * @return {Region}        The union region
+ */
+YAHOO.util.Region.prototype.union = function(region) {
+    var t = Math.min( this.top,    region.top    );
+    var r = Math.max( this.right,  region.right  );
+    var b = Math.max( this.bottom, region.bottom );
+    var l = Math.min( this.left,   region.left   );
+
+    return new YAHOO.util.Region(t, r, b, l);
+};
+
+/**
+ * toString
+ * @method toString
+ * @return string the region properties
+ */
+YAHOO.util.Region.prototype.toString = function() {
+    return ( "Region {"    +
+             "top: "       + this.top    + 
+             ", right: "   + this.right  + 
+             ", bottom: "  + this.bottom + 
+             ", left: "    + this.left   + 
+             "}" );
+};
+
+/**
+ * Returns a region that is occupied by the DOM element
+ * @method getRegion
+ * @param  {HTMLElement} el The element
+ * @return {Region}         The region that the element occupies
+ * @static
+ */
+YAHOO.util.Region.getRegion = function(el) {
+    var p = YAHOO.util.Dom.getXY(el);
+
+    var t = p[1];
+    var r = p[0] + el.offsetWidth;
+    var b = p[1] + el.offsetHeight;
+    var l = p[0];
+
+    return new YAHOO.util.Region(t, r, b, l);
+};
+
+/////////////////////////////////////////////////////////////////////////////
+
+
+/**
+ * A point is a region that is special in that it represents a single point on 
+ * the grid.
+ * @namespace YAHOO.util
+ * @class Point
+ * @param {Int} x The X position of the point
+ * @param {Int} y The Y position of the point
+ * @constructor
+ * @extends YAHOO.util.Region
+ */
+YAHOO.util.Point = function(x, y) {
+   if (YAHOO.lang.isArray(x)) { // accept input from Dom.getXY, Event.getXY, etc.
+      y = x[1]; // dont blow away x yet
+      x = x[0];
+   }
+   
+    /**
+     * The X position of the point, which is also the right, left and index zero (for Dom.getXY symmetry)
+     * @property x
+     * @type Int
+     */
+
+    this.x = this.right = this.left = this[0] = x;
+     
+    /**
+     * The Y position of the point, which is also the top, bottom and index one (for Dom.getXY symmetry)
+     * @property y
+     * @type Int
+     */
+    this.y = this.top = this.bottom = this[1] = y;
+};
+
+YAHOO.util.Point.prototype = new YAHOO.util.Region();
+
+YAHOO.register("dom", YAHOO.util.Dom, {version: "2.6.0", build: "1321"});