    // @tag dom,core
    /**
     * @class Ext.dom.Element
     * @alternateClassName Ext.Element
     * @alternateClassName Ext.core.Element
     * @extends Ext.dom.AbstractElement
     *
     * Encapsulates a DOM element, adding simple DOM manipulation facilities, normalizing for browser differences.
     *
     * All instances of this class inherit the methods of {@link Ext.fx.Anim} making visual effects easily available to all
     * DOM elements.
     *
     * Note that the events documented in this class are not Ext events, they encapsulate browser events. Some older browsers
     * may not support the full range of events. Which events are supported is beyond the control of Ext JS.
     *
     * Usage:
     *
     *     // by id
     *     var el = Ext.get("my-div");
     *
     *     // by DOM element reference
     *     var el = Ext.get(myDivElement);
     *
     * # Animations
     *
     * When an element is manipulated, by default there is no animation.
     *
     *     var el = Ext.get("my-div");
     *
     *     // no animation
     *     el.setWidth(100);
     *
     * Many of the functions for manipulating an element have an optional "animate" parameter. This parameter can be
     * specified as boolean (true) for default animation effects.
     *
     *     // default animation
     *     el.setWidth(100, true);
     *
     * To configure the effects, an object literal with animation options to use as the Element animation configuration
     * object can also be specified. Note that the supported Element animation configuration options are a subset of the
     * {@link Ext.fx.Anim} animation options specific to Fx effects. The supported Element animation configuration options
     * are:
     *
     *     Option    Default   Description
     *     --------- --------  ---------------------------------------------
     *     {@link Ext.fx.Anim#duration duration}  350       The duration of the animation in milliseconds
     *     {@link Ext.fx.Anim#easing easing}    easeOut   The easing method
     *     {@link Ext.fx.Anim#callback callback}  none      A function to execute when the anim completes
     *     {@link Ext.fx.Anim#scope scope}     this      The scope (this) of the callback function
     *
     * Usage:
     *
     *     // Element animation options object
     *     var opt = {
     *         {@link Ext.fx.Anim#duration duration}: 1000,
     *         {@link Ext.fx.Anim#easing easing}: 'elasticIn',
     *         {@link Ext.fx.Anim#callback callback}: this.foo,
     *         {@link Ext.fx.Anim#scope scope}: this
     *     };
     *     // animation with some options set
     *     el.setWidth(100, opt);
     *
     * The Element animation object being used for the animation will be set on the options object as "anim", which allows
     * you to stop or manipulate the animation. Here is an example:
     *
     *     // using the "anim" property to get the Anim object
     *     if(opt.anim.isAnimated()){
     *         opt.anim.stop();
     *     }
     *
     * # Composite (Collections of) Elements
     *
     * For working with collections of Elements, see {@link Ext.CompositeElement}
     *
     * @constructor
     * Creates new Element directly.
     * @param {String/HTMLElement} element
     * @param {Boolean} [forceNew] By default the constructor checks to see if there is already an instance of this
     * element in the cache and if there is it returns the same instance. This will skip that check (useful for extending
     * this class).
     * @return {Object}
     */
    Ext.define('Ext.dom.Element', function(Element) {
        var HIDDEN          = 'hidden',
            DOC             = document,
            VISIBILITY      = "visibility",
            DISPLAY         = "display",
            NONE            = "none",
            XMASKED         = Ext.baseCSSPrefix + "masked",
            XMASKEDRELATIVE = Ext.baseCSSPrefix + "masked-relative",
            EXTELMASKMSG    = Ext.baseCSSPrefix + "mask-msg",
            bodyRe          = /^body/i,
            visFly,

            // speedy lookup for elements never to box adjust
            noBoxAdjust = Ext.isStrict ? {
                select: 1
            }: {
                input: 1,
                select: 1,
                textarea: 1
            },

            // Pseudo for use by cacheScrollValues
            isScrolled = function(c) {
                var r = [], ri = -1,
                    i, ci;
                for (i = 0; ci = c[i]; i++) {
                    if (ci.scrollTop > 0 || ci.scrollLeft > 0) {
                        r[++ri] = ci;
                    }
                }
                return r;
            };

        return {

            extend: 'Ext.dom.AbstractElement',

            alternateClassName: ['Ext.Element', 'Ext.core.Element'],

            requires: [
                'Ext.dom.Query',
                'Ext.dom.Element_anim',
                'Ext.dom.Element_dd',
                'Ext.dom.Element_fx',
                'Ext.dom.Element_position',
                'Ext.dom.Element_scroll',
                'Ext.dom.Element_style'
            ],

            tableTagRe: /^(?:tr|td|table|tbody)$/i,

            mixins: [
                'Ext.util.Positionable'
            ],

            addUnits: function() {
                return Element.addUnits.apply(Element, arguments);
            },

            /**
             * Tries to focus the element. Any exceptions are caught and ignored.
             * @param {Number} [defer] Milliseconds to defer the focus
             * @return {Ext.dom.Element} this
             */
            focus: function(defer, /* private */ dom) {
                var me = this;

                dom = dom || me.dom;
                try {
                    if (Number(defer)) {
                        Ext.defer(me.focus, defer, me, [null, dom]);
                    } else {
                        dom.focus();
                    }
                } catch(e) {
                }
                return me;
            },

            /**
            * Tries to blur the element. Any exceptions are caught and ignored.
            * @return {Ext.dom.Element} this
            */
            blur: function() {
                var me = this,
                    dom = me.dom;
                // In IE, blurring the body can cause the browser window to hide.
                // Blurring the body is redundant, so instead we just focus it
                if (dom !== document.body) {
                    try {
                        dom.blur();
                    } catch(e) {
                    }
                    return me;
                } else {
                    return me.focus(undefined, dom);
                }
            },

            /**
            * Tests various css rules/browsers to determine if this element uses a border box
            * @return {Boolean}
            */
            isBorderBox: function() {
                var box = Ext.isBorderBox;

                // IE6/7 force input elements to content-box even if border-box is set explicitly
                if (box && Ext.isIE7m) {
                    box = !((this.dom.tagName || "").toLowerCase() in noBoxAdjust);
                }
                return box;
            },

            /**
            * Sets up event handlers to call the passed functions when the mouse is moved into and out of the Element.
            * @param {Function} overFn The function to call when the mouse enters the Element.
            * @param {Function} outFn The function to call when the mouse leaves the Element.
            * @param {Object} [scope] The scope (`this` reference) in which the functions are executed. Defaults
            * to the Element's DOM element.
            * @param {Object} [options] Options for the listener. See {@link Ext.util.Observable#addListener the
            * options parameter}.
            * @return {Ext.dom.Element} this
            */
            hover: function(overFn, outFn, scope, options) {
                var me = this;
                me.on('mouseenter', overFn, scope || me.dom, options);
                me.on('mouseleave', outFn, scope || me.dom, options);
                return me;
            },

            /**
            * Returns the value of a namespaced attribute from the element's underlying DOM node.
            * @param {String} namespace The namespace in which to look for the attribute
            * @param {String} name The attribute name
            * @return {String} The attribute value
            */
            getAttributeNS: function(ns, name) {
                return this.getAttribute(name, ns);
            },

            getAttribute: (Ext.isIE && !(Ext.isIE9p && DOC.documentMode >= 9)) ?

                // Essentially all web browsers (Firefox, Internet Explorer, recent versions of Opera, Safari, Konqueror, and iCab,
                // as a non-exhaustive list) return null when the specified attribute does not exist on the specified element.
                // The DOM specification says that the correct return value in this case is actually the empty string, and some
                // DOM implementations implement this behavior. The implementation of getAttribute in XUL (Gecko) actually follows
                // the specification and returns an empty string. Consequently, you should use hasAttribute to check for an attribute's
                // existence prior to calling getAttribute() if it is possible that the requested attribute does not exist on the specified element.
                //
                // https://developer.mozilla.org/en-US/docs/DOM/element.getAttribute
                // http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-745549614

                function(name, ns) {
                    var d = this.dom,
                            type;
                    if (ns) {
                        type = typeof d[ns + ":" + name];
                        if (type != 'undefined' && type != 'unknown') {
                            return d[ns + ":" + name] || null;
                        }
                        return null;
                    }
                    if (name === "for") {
                        name = "htmlFor";
                    }
                    return d[name] || null;
                } : function(name, ns) {
                    var d = this.dom;
                    if (ns) {
                        return d.getAttributeNS(ns, name) || d.getAttribute(ns + ":" + name);
                    }
                    return  d.getAttribute(name) || d[name] || null;
                },

            /**
            * When an element is moved around in the DOM, or is hidden using `display:none`, it loses layout, and therefore
            * all scroll positions of all descendant elements are lost.
            *
            * This function caches them, and returns a function, which when run will restore the cached positions.
            * In the following example, the Panel is moved from one Container to another which will cause it to lose all scroll positions:
            *
            *     var restoreScroll = myPanel.el.cacheScrollValues();
            *     myOtherContainer.add(myPanel);
            *     restoreScroll();
            *
            * @return {Function} A function which will restore all descentant elements of this Element to their scroll
            * positions recorded when this function was executed. Be aware that the returned function is a closure which has
            * captured the scope of `cacheScrollValues`, so take care to derefence it as soon as not needed - if is it is a `var`
            * it will drop out of scope, and the reference will be freed.
            */
            cacheScrollValues: function() {
                var me = this,
                    scrolledDescendants,
                    el, i,
                    scrollValues = [],
                    result = function() {
                        for (i = 0; i < scrolledDescendants.length; i++) {
                            el = scrolledDescendants[i];
                            el.scrollLeft = scrollValues[i][0];
                            el.scrollTop  = scrollValues[i][1];
                        }
                    };

                if (!Ext.DomQuery.pseudos.isScrolled) {
                    Ext.DomQuery.pseudos.isScrolled = isScrolled;
                }
                scrolledDescendants = me.query(':isScrolled');
                for (i = 0; i < scrolledDescendants.length; i++) {
                    el = scrolledDescendants[i];
                    scrollValues[i] = [el.scrollLeft, el.scrollTop];
                }
                return result;
            },

            /**
            * @property {Boolean} autoBoxAdjust
            * True to automatically adjust width and height settings for box-model issues.
            */
            autoBoxAdjust: true,

            /**
            * Checks whether the element is currently visible using both visibility and display properties.
            * @param {Boolean} [deep=false] True to walk the dom and see if parent elements are hidden.
            * If false, the function only checks the visibility of the element itself and it may return
            * `true` even though a parent is not visible.
            * @return {Boolean} `true` if the element is currently visible, else `false`
            */
            isVisible : function(deep) {
                var me = this,
                    dom = me.dom,
                    stopNode = dom.ownerDocument.documentElement;

                if (!visFly) {
                    visFly = new Element.Fly();
                }

                while (dom !== stopNode) {
                    // We're invisible if we hit a nonexistent parentNode or a document
                    // fragment or computed style visibility:hidden or display:none
                    if (!dom || dom.nodeType === 11 || (visFly.attach(dom)).isStyle(VISIBILITY, HIDDEN) || visFly.isStyle(DISPLAY, NONE)) {
                        return false;
                    }
                    // Quit now unless we are being asked to check parent nodes.
                    if (!deep) {
                        break;
                    }
                    dom = dom.parentNode;
                }
                return true;
            },

            /**
            * Returns true if display is not "none"
            * @return {Boolean}
            */
            isDisplayed : function() {
                return !this.isStyle(DISPLAY, NONE);
            },

            /**
            * Convenience method for setVisibilityMode(Element.DISPLAY)
            * @param {String} [display] What to set display to when visible
            * @return {Ext.dom.Element} this
            */
            enableDisplayMode : function(display) {
                var me = this;

                me.setVisibilityMode(Element.DISPLAY);

                if (!Ext.isEmpty(display)) {
                    (me.$cache || me.getCache()).data.originalDisplay = display;
                }

                return me;
            },

            /**
            * Puts a mask over this element to disable user interaction. Requires core.css.
            * This method can only be applied to elements which accept child nodes.
            * @param {String} [msg] A message to display in the mask
            * @param {String} [msgCls] A css class to apply to the msg element
            * @return {Ext.dom.Element} The mask element
            */
            mask : function(msg, msgCls /* private - passed by AbstractComponent.mask to avoid the need to interrogate the DOM to get the height*/, elHeight) {
                var me            = this,
                    dom           = me.dom,
                    // In some cases, setExpression will exist but not be of a function type,
                    // so we check it explicitly here to stop IE throwing errors
                    setExpression = dom.style.setExpression,
                    data          = (me.$cache || me.getCache()).data,
                    maskShimEl    = data.maskShimEl,
                    maskEl        = data.maskEl,
                    maskMsg       = data.maskMsg,
                    widthExpression, heightExpression, docElem, ie6DocElHeight;

                if (!(bodyRe.test(dom.tagName) && me.getStyle('position') == 'static')) {
                    me.addCls(XMASKEDRELATIVE);
                }

                // We always needs to recreate the mask since the DOM element may have been re-created
                if (maskEl) {
                    maskEl.remove();
                }

                if (maskMsg) {
                    maskMsg.remove();
                }

                if (maskShimEl) {
                    maskShimEl.remove();
                }

                if (Ext.isIE6) {
                    maskShimEl = Ext.DomHelper.append(dom, {
                        tag: 'iframe',
                        role: 'presentation',
                        cls : Ext.baseCSSPrefix + 'shim ' + Ext.baseCSSPrefix + 'mask-shim'
                    }, true);
                    data.maskShimEl = maskShimEl;
                    maskShimEl.setDisplayed(true);
                }

                Ext.DomHelper.append(dom, [{
                    role: 'presentation',
                    cls : Ext.baseCSSPrefix + "mask",
                    style: 'top:0;left:0;'
                }, {
                    role: 'presentation',
                    cls : msgCls ? EXTELMASKMSG + " " + msgCls : EXTELMASKMSG,
                    cn  : {
                        tag: 'div',
                        role: 'presentation',
                        cls: Ext.baseCSSPrefix + 'mask-msg-inner',
                        cn: {
                            tag: 'div',
                            role: 'presentation',
                            cls: Ext.baseCSSPrefix + 'mask-msg-text',
                            html: msg || ''
                        }
                    }
                }]);

                maskMsg = Ext.get(dom.lastChild);
                maskEl = Ext.get(maskMsg.dom.previousSibling);

                data.maskMsg = maskMsg;
                data.maskEl = maskEl;

                me.addCls(XMASKED);
                maskEl.setDisplayed(true);

                if (typeof msg == 'string') {
                    maskMsg.setDisplayed(true);
                    maskMsg.center(me);
                } else {
                    maskMsg.setDisplayed(false);
                }

                // Modern browsers will mask the body el using fixed positioning on the maskEl.
                // Older IE browsers in quirks mode will not get the fixed-mask class but
                // instead will use CSS expressions to achieve the same result (see below).
                // See EXTJSIV-10726.
                if (Ext.isStrict && !Ext.isIE6) {
                    if (dom === DOC.body) {
                        maskEl.addCls(Ext.baseCSSPrefix + 'mask-fixed');
                    }
                }

                // NOTE: CSS expressions are resource intensive and to be used only as a last resort
                // These expressions are removed as soon as they are no longer necessary - in the unmask method.
                // In normal use cases an element will be masked for a limited period of time.
                // Fix for https://sencha.jira.com/browse/EXTJSIV-19.
                // IE6 strict mode and IE6-9 quirks mode takes off left+right padding when calculating width!
                //
                // Note that it's not necessary to compute height and width for IE browsers when it's in strict
                // mode and the element to be masked is the body.
                if (dom !== DOC.body || Ext.isIE6 || Ext.isIEQuirks) {
                    if (!Ext.supports.IncludePaddingInWidthCalculation && setExpression) {
                        // In an occasional case setExpression will throw an exception
                        try {
                            maskEl.dom.style.setExpression('width', 'this.parentNode.clientWidth + "px"');
                            widthExpression = 'this.parentNode.clientWidth + "px"';
                            if (maskShimEl) {
                                maskShimEl.dom.style.setExpression('width', widthExpression);
                            }
                            maskEl.dom.style.setExpression('width', widthExpression);
                        } catch (e) {}
                    }

                    // Some versions and modes of IE subtract top+bottom padding when calculating height.
                    // Different versions from those which make the same error for width!
                    if (!Ext.supports.IncludePaddingInHeightCalculation && setExpression) {
                        // In an occasional case setExpression will throw an exception
                        try {
                            heightExpression = 'this.parentNode.' + (dom == DOC.body ? 'scrollHeight' : 'offsetHeight') + ' + "px"';
                            if (maskShimEl) {
                                maskShimEl.dom.style.setExpression('height', heightExpression);
                            }
                            maskEl.dom.style.setExpression('height', heightExpression);
                        } catch (e) {}
                    }
                    // ie will not expand full height automatically
                    else if (Ext.isIE9m && !(Ext.isIE7 && Ext.isStrict) && me.getStyle('height') == 'auto') {
                        if (Ext.isIE6 && Ext.isStrict) {
                            docElem = dom.parentNode;
                            // Note in IE 6 Standards, the scrollHeight is on the DocumentElement not the body,
                            // so reading height from the body el will return a very small value.
                            //
                            // Also, it appears that scrollHeight will not equal clientHeight when the browser
                            // is not overflowing in IE 6 (it will be less), so getting the max height of either
                            // will work.
                            ie6DocElHeight = Math.max(docElem.clientHeight, docElem.scrollHeight);
                        }
                        if (maskShimEl) {
                            maskShimEl.setSize(undefined, elHeight || ie6DocElHeight || me.getHeight());
                        }
                        maskEl.setSize(undefined, elHeight || ie6DocElHeight || me.getHeight());
                    }
                }
                return maskEl;
            },

            /**
            * Hides a previously applied mask.
            */
            unmask : function() {
                var me      = this,
                    data    = (me.$cache || me.getCache()).data,
                    maskEl  = data.maskEl,
                    maskShimEl = data.maskShimEl,
                    maskMsg = data.maskMsg,
                    style;

                if (maskEl) {
                    style = maskEl.dom.style;
                    // Remove resource-intensive CSS expressions as soon as they are not required.
                    if (style.clearExpression) {
                        style.clearExpression('width');
                        style.clearExpression('height');
                    }

                    if (maskEl) {
                        maskEl.remove();
                        delete data.maskEl;
                    }

                    if (maskMsg) {
                        maskMsg.remove();
                        delete data.maskMsg;
                    }

                    me.removeCls([XMASKED, XMASKEDRELATIVE]);

                    if (maskShimEl) {
                        style = maskShimEl.dom.style;
                        // Remove resource-intensive CSS expressions as soon as they are not required.
                        if (style.clearExpression) {
                            style.clearExpression('width');
                            style.clearExpression('height');
                        }

                        maskShimEl.remove();
                        delete data.maskShimEl;
                    }
                }
            },

            /**
            * Returns true if this element is masked. Also re-centers any displayed message within the mask.
            * @return {Boolean}
            */
            isMasked : function() {
                var me      = this,
                    data    = (me.$cache || me.getCache()).data,
                    maskEl  = data.maskEl,
                    maskMsg = data.maskMsg,
                    hasMask = false;

                if (maskEl && maskEl.isVisible()) {
                    if (maskMsg) {
                        maskMsg.center(me);
                    }
                    hasMask = true;
                }
                return hasMask;
            },

            /**
            * Creates an iframe shim for this element to keep selects and other windowed objects from
            * showing through.
            * @return {Ext.dom.Element} The new shim element
            */
            createShim : function() {
                var el = DOC.createElement('iframe'),
                    shim;

                el.frameBorder = '0';
                el.className = Ext.baseCSSPrefix + 'shim';
                el.src = Ext.SSL_SECURE_URL;
                el.setAttribute('role', 'presentation');
                shim = Ext.get(this.dom.parentNode.insertBefore(el, this.dom));
                shim.autoBoxAdjust = false;
                return shim;
            },

            /**
            * Convenience method for constructing a KeyMap
            * @param {String/Number/Number[]/Object} key Either a string with the keys to listen for, the numeric key code,
            * array of key codes or an object with the following options:
            * @param {Number/Array} key.key
            * @param {Boolean} key.shift
            * @param {Boolean} key.ctrl
            * @param {Boolean} key.alt
            * @param {Function} fn The function to call
            * @param {Object} [scope] The scope (`this` reference) in which the specified function is executed. Defaults to this Element.
            * @return {Ext.util.KeyMap} The KeyMap created
            */
            addKeyListener : function(key, fn, scope){
                var config;
                if(typeof key != 'object' || Ext.isArray(key)){
                    config = {
                        target: this,
                        key: key,
                        fn: fn,
                        scope: scope
                    };
                }else{
                    config = {
                        target: this,
                        key : key.key,
                        shift : key.shift,
                        ctrl : key.ctrl,
                        alt : key.alt,
                        fn: fn,
                        scope: scope
                    };
                }
                return new Ext.util.KeyMap(config);
            },

            /**
            * Creates a KeyMap for this element
            * @param {Object} config The KeyMap config. See {@link Ext.util.KeyMap} for more details
            * @return {Ext.util.KeyMap} The KeyMap created
            */
            addKeyMap : function(config) {
                return new Ext.util.KeyMap(Ext.apply({
                    target: this
                }, config));
            },

            //  Mouse events
            /**
            * @event click
            * Fires when a mouse click is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event contextmenu
            * Fires when a right click is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event dblclick
            * Fires when a mouse double click is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event mousedown
            * Fires when a mousedown is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event mouseup
            * Fires when a mouseup is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event mouseover
            * Fires when a mouseover is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event mousemove
            * Fires when a mousemove is detected with the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event mouseout
            * Fires when a mouseout is detected with the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event mouseenter
            * Fires when the mouse enters the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event mouseleave
            * Fires when the mouse leaves the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */

            //  Keyboard events
            /**
            * @event keypress
            * Fires when a keypress is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event keydown
            * Fires when a keydown is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event keyup
            * Fires when a keyup is detected within the element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */

            //  HTML frame/object events
            /**
            * @event load
            * Fires when the user agent finishes loading all content within the element. Only supported by window, frames,
            * objects and images.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event unload
            * Fires when the user agent removes all content from a window or frame. For elements, it fires when the target
            * element or any of its content has been removed.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event abort
            * Fires when an object/image is stopped from loading before completely loaded.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event error
            * Fires when an object/image/frame cannot be loaded properly.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event resize
            * Fires when a document view is resized.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event scroll
            * Fires when a document view is scrolled.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */

            //  Form events
            /**
            * @event select
            * Fires when a user selects some text in a text field, including input and textarea.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event change
            * Fires when a control loses the input focus and its value has been modified since gaining focus.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event submit
            * Fires when a form is submitted.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event reset
            * Fires when a form is reset.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event focus
            * Fires when an element receives focus either via the pointing device or by tab navigation.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event blur
            * Fires when an element loses focus either via the pointing device or by tabbing navigation.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */

            //  User Interface events
            /**
            * @event DOMFocusIn
            * Where supported. Similar to HTML focus event, but can be applied to any focusable element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMFocusOut
            * Where supported. Similar to HTML blur event, but can be applied to any focusable element.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMActivate
            * Where supported. Fires when an element is activated, for instance, through a mouse click or a keypress.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */

            //  DOM Mutation events
            /**
            * @event DOMSubtreeModified
            * Where supported. Fires when the subtree is modified.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMNodeInserted
            * Where supported. Fires when a node has been added as a child of another node.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMNodeRemoved
            * Where supported. Fires when a descendant node of the element is removed.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMNodeRemovedFromDocument
            * Where supported. Fires when a node is being removed from a document.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMNodeInsertedIntoDocument
            * Where supported. Fires when a node is being inserted into a document.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMAttrModified
            * Where supported. Fires when an attribute has been modified.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */
            /**
            * @event DOMCharacterDataModified
            * Where supported. Fires when the character data has been modified.
            * @param {Ext.EventObject} e The {@link Ext.EventObject} encapsulating the DOM event.
            * @param {HTMLElement} t The target of the event.
            */

            /**
            * Appends an event handler to this element.
            *
            * @param {String/Object} eventName The name of event to handle.
            * May also be an object who's property names are event names.
            *
            * @param {Function} [fn] The handler function the event invokes. This function is passed the following parameters:
            *
            * - **evt** : EventObject
            *
            *   The {@link Ext.EventObject EventObject} describing the event.
            *
            * - **el** : HtmlElement
            *
            *   The DOM element which was the target of the event. Note that this may be filtered by using the delegate option.
            *
            * - **o** : Object
            *
            *   The options object from the call that setup the listener.
            *
            * @param {Object} scope (optional) The scope (**this** reference) in which the handler function is executed. **If
            * omitted, defaults to this Element.**
            *
            * @param {Object} options (optional) An object containing handler configuration properties. This may contain any of
            * the following properties:
            *
            * - **scope** Object :
            *
            *   The scope (**this** reference) in which the handler function is executed. **If omitted, defaults to this
            *   Element.**
            *
            * - **delegate** String:
            *
            *   A simple selector to filter the target or look for a descendant of the target. See below for additional details.
            *
            * - **stopEvent** Boolean:
            *
            *   True to stop the event. That is stop propagation, and prevent the default action.
            *
            * - **preventDefault** Boolean:
            *
            *   True to prevent the default action
            *
            * - **stopPropagation** Boolean:
            *
            *   True to prevent event propagation
            *
            * - **normalized** Boolean:
            *
            *   False to pass a browser event to the handler function instead of an Ext.EventObject
            *
            * - **target** Ext.dom.Element:
            *
            *   Only call the handler if the event was fired on the target Element, _not_ if the event was bubbled up from a
            *   child node.
            *
            * - **delay** Number:
            *
            *   The number of milliseconds to delay the invocation of the handler after the event fires.
            *
            * - **single** Boolean:
            *
            *   True to add a handler to handle just the next firing of the event, and then remove itself.
            *
            * - **buffer** Number:
            *
            *   Causes the handler to be scheduled to run in an {@link Ext.util.DelayedTask} delayed by the specified number of
            *   milliseconds. If the event fires again within that time, the original handler is _not_ invoked, but the new
            *   handler is scheduled in its place.
            *
            * **Combining Options**
            *
            * Using the options argument, it is possible to combine different types of listeners:
            *
            * A delayed, one-time listener that auto stops the event and adds a custom argument (forumId) to the options
            * object. The options object is available as the third parameter in the handler function.
            *
            * Code:
            *
            *     el.on('click', this.onClick, this, {
            *         single: true,
            *         delay: 100,
            *         stopEvent : true,
            *         forumId: 4
            *     });
            *
            * **Attaching multiple handlers in 1 call**
            *
            * The method also allows for a single argument to be passed which is a config object containing properties which
            * specify multiple handlers.
            *
            * Code:
            *
            *     el.on({
            *         'click' : {
            *             fn: this.onClick,
            *             scope: this,
            *             delay: 100
            *         },
            *         'mouseover' : {
            *             fn: this.onMouseOver,
            *             scope: this
            *         },
            *         'mouseout' : {
            *             fn: this.onMouseOut,
            *             scope: this
            *         }
            *     });
            *
            * Or a shorthand syntax:
            *
            * Code:
            *
            *     el.on({
            *         'click' : this.onClick,
            *         'mouseover' : this.onMouseOver,
            *         'mouseout' : this.onMouseOut,
            *         scope: this
            *     });
            *
            * **delegate**
            *
            * This is a configuration option that you can pass along when registering a handler for an event to assist with
            * event delegation. Event delegation is a technique that is used to reduce memory consumption and prevent exposure
            * to memory-leaks. By registering an event for a container element as opposed to each element within a container.
            * By setting this configuration option to a simple selector, the target element will be filtered to look for a
            * descendant of the target. See {@link Ext.dom.Query} for information about simple selectors. Example:
            *
            *     // using this markup:
            *     <div id='elId'>
            *         <p id='p1'>paragraph one</p>
            *         <p id='p2' class='clickable'>paragraph two</p>
            *         <p id='p3'>paragraph three</p>
            *     </div>
            *
            *     // utilize event delegation to registering just one handler on the container element:
            *     el = Ext.get('elId');
            *     el.on(
            *         'click',
            *         function(e,t) {
            *             // handle click
            *             console.info(t.id); // 'p2'
            *         },
            *         this,
            *         {
            *             // filter the target element to be a descendant with the class 'clickable'
            *             delegate: '.clickable'
            *         }
            *     );
            *
            * @return {Ext.dom.Element} this
            */
            on: function(eventName, fn, scope, options) {
                Ext.EventManager.on(this, eventName, fn, scope || this, options);
                return this;
            },

            /**
            * Removes an event handler from this element.
            *
            * **Note**: if a *scope* was explicitly specified when {@link #on adding} the listener,
            * the same scope must be specified here.
            *
            * Example:
            *
            *     el.un('click', this.handlerFn);
            *     // or
            *     el.removeListener('click', this.handlerFn);
            *
            * @param {String} eventName The name of the event from which to remove the handler.
            * @param {Function} fn The handler function to remove. **This must be a reference to the function passed into the
            * {@link #on} call.**
            * @param {Object} scope If a scope (**this** reference) was specified when the listener was added, then this must
            * refer to the same object.
            * @return {Ext.dom.Element} this
            */
            un: function(eventName, fn, scope) {
                Ext.EventManager.un(this, eventName, fn, scope || this);
                return this;
            },

            /**
            * Removes all previous added listeners from this element
            * @return {Ext.dom.Element} this
            */
            removeAllListeners: function() {
                Ext.EventManager.removeAll(this);
                return this;
            },

            /**
            * Recursively removes all previous added listeners from this element and its children
            * @return {Ext.dom.Element} this
            */
            purgeAllListeners: function() {
                Ext.EventManager.purgeElement(this);
                return this;
            },

            select: function(selector) {
                return Element.select(selector, false,  this.dom);
            }
        };
    }, function() {

        var DOC             = document,
            EC              = Ext.cache,
            Element         = this,
            AbstractElement = Ext.dom.AbstractElement,
            focusRe         = /^a|button|embed|iframe|input|object|select|textarea$/i,
            nonSpaceRe      = /\S/,
            scriptTagRe     = /(?:<script([^>]*)?>)((\n|\r|.)*?)(?:<\/script>)/ig,
            replaceScriptTagRe = /(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)/ig,
            srcRe           = /\ssrc=([\'\"])(.*?)\1/i,
            typeRe          = /\stype=([\'\"])(.*?)\1/i,
            useDocForId     = !Ext.isIE8m,
            internalFly;

        Element.boxMarkup = [
            '<div class="{0}-tl" role="presentation">',
                '<div class="{0}-tr" role="presentation">',
                    '<div class="{0}-tc" role="presentation"></div>',
                '</div>',
            '</div>',
            '<div class="{0}-ml" role="presentation">',
                '<div class="{0}-mr" role="presentation">',
                    '<div class="{0}-mc" role="presentation"></div>',
                '</div>',
            '</div>',
            '<div class="{0}-bl" role="presentation">',
                '<div class="{0}-br" role="presentation">',
                    '<div class="{0}-bc" role="presentation"></div>',
                '</div>',
            '</div>'
        ].join('');
        //</!if>

        // private
        // Garbage collection - uncache elements/purge listeners on orphaned elements
        // so we don't hold a reference and cause the browser to retain them
        function garbageCollect() {
            if (!Ext.enableGarbageCollector) {
                clearInterval(Element.collectorThreadId);
            } else {
                var eid,
                    d,
                    o,
                    t;

                for (eid in EC) {
                    if (!EC.hasOwnProperty(eid)) {
                        continue;
                    }

                    o = EC[eid];

                    // Skip document and window elements
                    if (o.skipGarbageCollection) {
                        continue;
                    }

                    d = o.dom;

                    //<debug>
                    // Should always have a DOM node
                    if (!d) {
                        Ext.Error.raise('Missing DOM node in element garbage collection: ' + eid);
                    }

                    // Check that document and window elements haven't got through
                    if (d && (d.getElementById || d.navigator)) {
                        Ext.Error.raise('Unexpected document or window element in element garbage collection');
                    }
                    //</debug>

                    // -------------------------------------------------------
                    // Determining what is garbage:
                    // -------------------------------------------------------
                    // !d.parentNode
                    // no parentNode == direct orphan, definitely garbage
                    // -------------------------------------------------------
                    // !d.offsetParent && !document.getElementById(eid)
                    // display none elements have no offsetParent so we will
                    // also try to look it up by it's id. However, check
                    // offsetParent first so we don't do unneeded lookups.
                    // This enables collection of elements that are not orphans
                    // directly, but somewhere up the line they have an orphan
                    // parent.
                    // -------------------------------------------------------
                    if (d && (!d.parentNode || (!d.offsetParent && !Ext.getElementById(eid)))) {
                        if (Ext.enableListenerCollection) {
                            Ext.EventManager.removeAll(d);
                        }
                        delete EC[eid];
                    }
                }
                // Cleanup IE Object leaks
                if (Ext.isIE) {
                    t = {};
                    for (eid in EC) {
                        if (!EC.hasOwnProperty(eid)) {
                            continue;
                        }
                        t[eid] = EC[eid];
                    }
                    EC = Ext.cache = t;
                }
            }
        }

        Element.collectorThreadId = setInterval(garbageCollect, 30000);

        //Stuff from Element-more.js
        Element.addMethods({

            /**
             * Monitors this Element for the mouse leaving. Calls the function after the specified delay only if
             * the mouse was not moved back into the Element within the delay. If the mouse *was* moved
             * back in, the function is not called.
             * @param {Number} delay The delay **in milliseconds** to wait for possible mouse re-entry before calling the handler function.
             * @param {Function} handler The function to call if the mouse remains outside of this Element for the specified time.
             * @param {Object} [scope] The scope (`this` reference) in which the handler function executes. Defaults to this Element.
             * @return {Object} The listeners object which was added to this element so that monitoring can be stopped. Example usage:
             *
             *     // Hide the menu if the mouse moves out for 250ms or more
             *     this.mouseLeaveMonitor = this.menuEl.monitorMouseLeave(250, this.hideMenu, this);
             *
             *     ...
             *     // Remove mouseleave monitor on menu destroy
             *     this.menuEl.un(this.mouseLeaveMonitor);
             *
             */
            monitorMouseLeave: function(delay, handler, scope) {
                var me = this,
                    timer,
                    listeners = {
                        mouseleave: function(e) {
                            timer = setTimeout(Ext.Function.bind(handler, scope||me, [e]), delay);
                        },
                        mouseenter: function() {
                            clearTimeout(timer);
                        },
                        freezeEvent: true
                    };

                me.on(listeners);
                return listeners;
            },

            /**
             * Stops the specified event(s) from bubbling and optionally prevents the default action
             * @param {String/String[]} eventName an event / array of events to stop from bubbling
             * @param {Boolean} [preventDefault] true to prevent the default action too
             * @return {Ext.dom.Element} this
             */
            swallowEvent : function(eventName, preventDefault) {
                var me = this,
                    e, eLen,
                    fn = function(e) {
                        e.stopPropagation();
                        if (preventDefault) {
                            e.preventDefault();
                        }
                    };

                if (Ext.isArray(eventName)) {
                    eLen = eventName.length;

                    for (e = 0; e < eLen; e++) {
                        me.on(eventName[e], fn);
                    }

                    return me;
                }
                me.on(eventName, fn);
                return me;
            },

            /**
             * Create an event handler on this element such that when the event fires and is handled by this element,
             * it will be relayed to another object (i.e., fired again as if it originated from that object instead).
             * @param {String} eventName The type of event to relay
             * @param {Object} observable Any object that extends {@link Ext.util.Observable} that will provide the context
             * for firing the relayed event
             */
            relayEvent : function(eventName, observable) {
                this.on(eventName, function(e) {
                    observable.fireEvent(eventName, e);
                });
            },

            /**
             * Removes Empty, or whitespace filled text nodes. Combines adjacent text nodes.
             * @param {Boolean} [forceReclean=false] By default the element keeps track if it has been cleaned already
             * so you can call this over and over. However, if you update the element and need to force a reclean, you
             * can pass true.
             */
            clean : function(forceReclean) {
                var me   = this,
                    dom  = me.dom,
                    data = (me.$cache || me.getCache()).data,
                    n    = dom.firstChild,
                    ni   = -1,
                    nx;

                if (data.isCleaned && forceReclean !== true) {
                    return me;
                }

                while (n) {
                    nx = n.nextSibling;
                    if (n.nodeType == 3) {
                        // Remove empty/whitespace text nodes
                        if (!(nonSpaceRe.test(n.nodeValue))) {
                            dom.removeChild(n);
                        // Combine adjacent text nodes
                        } else if (nx && nx.nodeType == 3) {
                            n.appendData(Ext.String.trim(nx.data));
                            dom.removeChild(nx);
                            nx = n.nextSibling;
                            n.nodeIndex = ++ni;
                        }
                    } else {
                        // Recursively clean
                        internalFly.attach(n).clean();
                        n.nodeIndex = ++ni;
                    }
                    n = nx;
                }

                data.isCleaned = true;
                return me;
            },

            /**
             * Direct access to the Ext.ElementLoader {@link Ext.ElementLoader#method-load} method. The method takes the same object
             * parameter as {@link Ext.ElementLoader#method-load}
             * @return {Ext.dom.Element} this
             */
            load : function(options) {
                this.getLoader().load(options);
                return this;
            },

            /**
             * Gets this element's {@link Ext.ElementLoader ElementLoader}
             * @return {Ext.ElementLoader} The loader
             */
            getLoader : function() {
                var me = this,
                    data = (me.$cache || me.getCache()).data,
                    loader = data.loader;

                if (!loader) {
                    data.loader = loader = new Ext.ElementLoader({
                        target: me
                    });
                }
                return loader;
            },

            /**
             * @private.
             * Currently used for updating grid cells without modifying DOM structure
             *
             * Synchronizes content of this Element with the content of the passed element.
             *
             * Style and CSS class are copied from source into this Element, and contents are synched
             * recursively. If a child node is a text node, the textual data is copied.
             */
            syncContent: function(source) {
                source = Ext.getDom(source);
                var sourceNodes = source.childNodes,
                    sourceLen = sourceNodes.length,
                    dest = this.dom,
                    destNodes = dest.childNodes,
                    destLen = destNodes.length,
                    i,  destNode, sourceNode,
                    nodeType, newAttrs, attLen, attName;

                // Copy top node's attributes across. Use IE-specific method if possible.
                // In IE10, there is a problem where the className will not get updated
                // in the view, even though the className on the dom element is correct.
                // See EXTJSIV-9462
                if (Ext.isIE9m && dest.mergeAttributes) {
                    dest.mergeAttributes(source, true);

                    // EXTJSIV-6803. IE's mergeAttributes appears not to make the source's "src" value available until after the image is ready.
                    // So programatically copy any src attribute.
                    dest.src = source.src;
                } else {
                    newAttrs = source.attributes;
                    attLen = newAttrs.length;
                    for (i = 0; i < attLen; i++) {
                        attName = newAttrs[i].name;
                        if (attName !== 'id') {
                            dest.setAttribute(attName, newAttrs[i].value);
                        }
                    }
                }

                // If the number of child nodes does not match, fall back to replacing innerHTML
                if (sourceLen !== destLen) {
                    dest.innerHTML = source.innerHTML;
                    return;
                }

                // Loop through source nodes.
                // If there are fewer, we must remove excess
                for (i = 0; i < sourceLen; i++) {
                    sourceNode = sourceNodes[i];
                    destNode = destNodes[i];
                    nodeType = sourceNode.nodeType;

                    // If node structure is out of sync, just drop innerHTML in and return
                    if (nodeType !== destNode.nodeType || (nodeType === 1 && sourceNode.tagName !== destNode.tagName)) {
                        dest.innerHTML = source.innerHTML;
                        return;
                    }

                    // Update text node
                    if (nodeType === 3) {
                        destNode.data = sourceNode.data;
                    }
                    // Sync element content
                    else {
                        if (sourceNode.id && destNode.id !== sourceNode.id) {
                            destNode.id = sourceNode.id;
                        }
                        destNode.style.cssText = sourceNode.style.cssText;
                        destNode.className = sourceNode.className;
                        internalFly.attach(destNode).syncContent(sourceNode);
                    }
                }
            },

            /**
             * Updates the innerHTML of this element, optionally searching for and processing scripts.
             * @param {String} html The new HTML
             * @param {Boolean} [loadScripts] True to look for and process scripts (defaults to false)
             * @param {Function} [callback] For async script loading you can be notified when the update completes
             * @return {Ext.dom.Element} this
             */
            update : function(html, loadScripts, callback) {
                var me = this,
                    id,
                    dom,
                    interval;

                if (!me.dom) {
                    return me;
                }
                html = html || '';
                dom = me.dom;

                if (loadScripts !== true) {
                    dom.innerHTML = html;
                    Ext.callback(callback, me);
                    return me;
                }

                id  = Ext.id();
                html += '<span id="' + id + '" role="presentation"></span>';

                interval = setInterval(function() {
                    var hd,
                        match,
                        attrs,
                        srcMatch,
                        typeMatch,
                        el,
                        s;
                    if (!(el = DOC.getElementById(id))) {
                        return false;
                    }
                    clearInterval(interval);
                    Ext.removeNode(el);
                    hd = Ext.getHead().dom;

                    while ((match = scriptTagRe.exec(html))) {
                        attrs = match[1];
                        srcMatch = attrs ? attrs.match(srcRe) : false;
                        if (srcMatch && srcMatch[2]) {
                           s = DOC.createElement("script");
                           s.src = srcMatch[2];
                           typeMatch = attrs.match(typeRe);
                           if (typeMatch && typeMatch[2]) {
                               s.type = typeMatch[2];
                           }
                           hd.appendChild(s);
                        } else if (match[2] && match[2].length > 0) {
                            if (window.execScript) {
                               window.execScript(match[2]);
                            } else {
                               window.eval(match[2]);
                            }
                        }
                    }
                    Ext.callback(callback, me);
                }, 20);
                dom.innerHTML = html.replace(replaceScriptTagRe, '');
                return me;
            },

            // inherit docs, overridden so we can add removeAnchor
            removeAllListeners : function() {
                this.removeAnchor();
                Ext.EventManager.removeAll(this.dom);
                return this;
            },

            /**
             * Creates a proxy element of this element
             * @param {String/Object} config The class name of the proxy element or a DomHelper config object
             * @param {String/HTMLElement} [renderTo] The element or element id to render the proxy to. Defaults to: document.body.
             * @param {Boolean} [matchBox=false] True to align and size the proxy to this element now.
             * @return {Ext.dom.Element} The new proxy element
             */
            createProxy : function(config, renderTo, matchBox) {
                config = (typeof config == 'object') ? config : { tag: "div", role: 'presentation', cls: config };

                var me = this,
                    proxy = renderTo ? Ext.DomHelper.append(renderTo, config, true) :
                                       Ext.DomHelper.insertBefore(me.dom, config, true);

                proxy.setVisibilityMode(Element.DISPLAY);
                proxy.hide();
                if (matchBox && me.setBox && me.getBox) { // check to make sure Element.position.js is loaded
                   proxy.setBox(me.getBox());
                }
                return proxy;
            },

            /**
             * Returns true if this element needs an explicit tabIndex to make it focusable. Input fields, text areas, buttons
             * anchors elements **with an href** etc do not need a tabIndex, but structural elements do.
             */
            needsTabIndex: function() {
                if (this.dom) {
                    if ((this.dom.nodeName === 'a') && (!this.dom.href)) {
                        return true;
                    }
                    return !focusRe.test(this.dom.nodeName);
                }
            },

            /**
             * Checks whether this element can be focused.
             * @return {Boolean} True if the element is focusable
             */
            isFocusable: function (/* private - assume it's the focusEl of a Component */ asFocusEl) {
                var dom = this.dom,
                    tabIndexAttr = dom.getAttributeNode('tabIndex'),
                    tabIndex,
                    nodeName = dom.nodeName,
                    canFocus = false;

                // Certain browsers always report zero in the absence of the tabIndex attribute.
                // Testing the specified property (Standards: http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-862529273)
                // Should filter out these cases.
                // The exceptions are IE6 to IE8. In these browsers all elements will yield a tabIndex
                // and therefore all elements will appear to be focusable.
                // This adversely affects modal Floating components.
                // These listen for the TAB key, and then test whether the event target === last focusable
                // or first focusable element, and forcibly to a circular navigation.
                // We cannot know the true first or last focusable element, so this problem still exists for IE6,7,8
                // See Ext.util.Floating
                if (tabIndexAttr && tabIndexAttr.specified) {
                    tabIndex = tabIndexAttr.value;
                }
                if (dom && !dom.disabled) {
                    // A tabIndex of -1 means it has to be programatically focused, so that needs FocusManager,
                    // and it has to be the focus holding el of a Component within the Component tree.
                    if (tabIndex == -1) { // note that the value is a string
                        canFocus = Ext.FocusManager && Ext.FocusManager.enabled && asFocusEl;
                    }
                    else {
                        // See if it's a naturally focusable element
                        if (focusRe.test(nodeName)) {
                            if ((nodeName !== 'a') || dom.href) {
                                canFocus = true;
                            }
                        }
                        // A non naturally focusable element is in the navigation flow if it has a positive numeric tab index.
                        else {
                            canFocus = tabIndex != null && tabIndex >= 0;
                        }
                    }
                    canFocus = canFocus && this.isVisible(true);
                }
                return canFocus;
            }
        });

        if (Ext.isIE9m) {
            Element.prototype.getById = function (id, asDom) {
                var dom = this.dom,
                    cacheItem, el, ret;

                if (dom) {
                    // for normal elements getElementById is the best solution, but if the el is
                    // not part of the document.body, we need to use all[]
                    el = (useDocForId && DOC.getElementById(id)) || dom.all[id];
                    if (el) {
                        if (asDom) {
                            ret = el;
                        } else {
                            // calling Element.get here is a real hit (2x slower) because it has to
                            // redetermine that we are giving it a dom el.
                            cacheItem = EC[id];
                            if (cacheItem && cacheItem.el) {
                                ret = Ext.updateCacheEntry(cacheItem, el).el;
                            } else {
                                ret = new Element(el);
                            }
                        }
                        return ret;
                    }
                }

                return asDom ? Ext.getDom(id) : Element.get(id);
            };
        }

        Element.createAlias({
            /**
             * @method
             * @inheritdoc Ext.dom.Element#on
             * Shorthand for {@link #on}.
             */
            addListener: 'on',
            /**
             * @method
             * @inheritdoc Ext.dom.Element#un
             * Shorthand for {@link #un}.
             */
            removeListener: 'un',
            /**
             * @method
             * @inheritdoc Ext.dom.Element#removeAllListeners
             * Alias for {@link #removeAllListeners}.
             */
            clearListeners: 'removeAllListeners',
            /**
             * @method
             * @inheritdoc Ext.dom.Element#isFocusable
             * Alias for {@link #isFocusable}.
             */
            focusable: 'isFocusable'
        });

        Element.Fly = AbstractElement.Fly = new Ext.Class({
            extend: Element,

            isFly: true,

            constructor: function(dom) {
                this.dom = dom;
                // set an "el" property that references "this".  This allows
                // Ext.util.Positionable methods to operate on this.el.dom since it
                // gets mixed into both Element and Component
                this.el = this;
            },

            attach: AbstractElement.Fly.prototype.attach
        });

        internalFly = new Element.Fly();

        if (Ext.isIE9m) {
            Ext.getElementById = function (id) {
                var el = DOC.getElementById(id),
                    detachedBodyEl;

                if (!el && (detachedBodyEl = AbstractElement.detachedBodyEl)) {
                    el = detachedBodyEl.dom.all[id];
                }

                return el;
            };
        } else if (!DOC.querySelector) {
            Ext.getDetachedBody = Ext.getBody;

            Ext.getElementById = function (id) {
                return DOC.getElementById(id);
            };
        }
    });