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                            /**
                             * Add style management functionality to DOM.
                             * @module dom
                             * @submodule dom-style
                             * @for DOM
                             */
                            
                            var DOCUMENT_ELEMENT = 'documentElement',
                                DEFAULT_VIEW = 'defaultView',
                                OWNER_DOCUMENT = 'ownerDocument',
                                STYLE = 'style',
                                FLOAT = 'float',
                                CSS_FLOAT = 'cssFloat',
                                STYLE_FLOAT = 'styleFloat',
                                TRANSPARENT = 'transparent',
                                GET_COMPUTED_STYLE = 'getComputedStyle',
                                GET_BOUNDING_CLIENT_RECT = 'getBoundingClientRect',
                            
                                DOCUMENT = Y.config.doc,
                            
                                Y_DOM = Y.DOM,
                            
                                TRANSFORM,
                                TRANSFORMORIGIN,
                                VENDOR_TRANSFORM = [
                                    'WebkitTransform',
                                    'MozTransform',
                                    'OTransform',
                                    'msTransform',
                                    'transform'
                                ],
                            
                                re_unit = /width|height|top|left|right|bottom|margin|padding/i;
                            
                            Y.Array.each(VENDOR_TRANSFORM, function(val) {
                                if (val in DOCUMENT[DOCUMENT_ELEMENT].style) {
                                    TRANSFORM = val;
                                    TRANSFORMORIGIN = val + "Origin";
                                }
                            });
                            
                            Y.mix(Y_DOM, {
                                DEFAULT_UNIT: 'px',
                            
                                CUSTOM_STYLES: {
                                },
                            
                            
                                /**
                                 * Sets a style property for a given element.
                                 * @method setStyle
                                 * @param {HTMLElement} node The HTMLElement to apply the style to.
                                 * @param {String} att The style property to set.
                                 * @param {String|Number} val The value.
                                 * @param {Object} [style] The style node. Defaults to `node.style`.
                                 */
                                setStyle: function(node, att, val, style) {
                                    style = style || node.style;
                                    var CUSTOM_STYLES = Y_DOM.CUSTOM_STYLES;
                            
                                    if (style) {
                                        if (val === null || val === '') { // normalize unsetting
                                            val = '';
                                        } else if (!isNaN(Number(val)) && re_unit.test(att)) { // number values may need a unit
                                            val += Y_DOM.DEFAULT_UNIT;
                                        }
                            
                                        if (att in CUSTOM_STYLES) {
                                            if (CUSTOM_STYLES[att].set) {
                                                CUSTOM_STYLES[att].set(node, val, style);
                                                return; // NOTE: return
                                            } else if (typeof CUSTOM_STYLES[att] === 'string') {
                                                att = CUSTOM_STYLES[att];
                                            }
                                        } else if (att === '') { // unset inline styles
                                            att = 'cssText';
                                            val = '';
                                        }
                                        style[att] = val;
                                    }
                                },
                            
                                /**
                                 * Returns the current style value for the given property.
                                 * @method getStyle
                                 * @param {HTMLElement} node The HTMLElement to get the style from.
                                 * @param {String} att The style property to get.
                                 * @param {Object} [style] The style node. Defaults to `node.style`.
                                 */
                                getStyle: function(node, att, style) {
                                    style = style || node.style;
                                    var CUSTOM_STYLES = Y_DOM.CUSTOM_STYLES,
                                        val = '';
                            
                                    if (style) {
                                        if (att in CUSTOM_STYLES) {
                                            if (CUSTOM_STYLES[att].get) {
                                                return CUSTOM_STYLES[att].get(node, att, style); // NOTE: return
                                            } else if (typeof CUSTOM_STYLES[att] === 'string') {
                                                att = CUSTOM_STYLES[att];
                                            }
                                        }
                                        val = style[att];
                                        if (val === '') { // TODO: is empty string sufficient?
                                            val = Y_DOM[GET_COMPUTED_STYLE](node, att);
                                        }
                                    }
                            
                                    return val;
                                },
                            
                                /**
                                 * Sets multiple style properties.
                                 * @method setStyles
                                 * @param {HTMLElement} node The HTMLElement to apply the styles to.
                                 * @param {Object} hash An object literal of property:value pairs.
                                 */
                                setStyles: function(node, hash) {
                                    var style = node.style;
                                    Y.each(hash, function(v, n) {
                                        Y_DOM.setStyle(node, n, v, style);
                                    }, Y_DOM);
                                },
                            
                                /**
                                 * Returns the computed style for the given node.
                                 * @method getComputedStyle
                                 * @param {HTMLElement} node The HTMLElement to get the style from.
                                 * @param {String} att The style property to get.
                                 * @return {String} The computed value of the style property.
                                 */
                                getComputedStyle: function(node, att) {
                                    var val = '',
                                        doc = node[OWNER_DOCUMENT],
                                        computed;
                            
                                    if (node[STYLE] && doc[DEFAULT_VIEW] && doc[DEFAULT_VIEW][GET_COMPUTED_STYLE]) {
                                        computed = doc[DEFAULT_VIEW][GET_COMPUTED_STYLE](node, null);
                                        if (computed) { // FF may be null in some cases (ticket #2530548)
                                            val = computed[att];
                                        }
                                    }
                                    return val;
                                }
                            });
                            
                            // normalize reserved word float alternatives ("cssFloat" or "styleFloat")
                            if (DOCUMENT[DOCUMENT_ELEMENT][STYLE][CSS_FLOAT] !== undefined) {
                                Y_DOM.CUSTOM_STYLES[FLOAT] = CSS_FLOAT;
                            } else if (DOCUMENT[DOCUMENT_ELEMENT][STYLE][STYLE_FLOAT] !== undefined) {
                                Y_DOM.CUSTOM_STYLES[FLOAT] = STYLE_FLOAT;
                            }
                            
                            // safari converts transparent to rgba(), others use "transparent"
                            if (Y.UA.webkit) {
                                Y_DOM[GET_COMPUTED_STYLE] = function(node, att) {
                                    var view = node[OWNER_DOCUMENT][DEFAULT_VIEW],
                                        val = view[GET_COMPUTED_STYLE](node, '')[att];
                            
                                    if (val === 'rgba(0, 0, 0, 0)') {
                                        val = TRANSPARENT;
                                    }
                            
                                    return val;
                                };
                            
                            }
                            
                            Y.DOM._getAttrOffset = function(node, attr) {
                                var val = Y.DOM[GET_COMPUTED_STYLE](node, attr),
                                    offsetParent = node.offsetParent,
                                    position,
                                    parentOffset,
                                    offset;
                            
                                if (val === 'auto') {
                                    position = Y.DOM.getStyle(node, 'position');
                                    if (position === 'static' || position === 'relative') {
                                        val = 0;
                                    } else if (offsetParent && offsetParent[GET_BOUNDING_CLIENT_RECT]) {
                                        parentOffset = offsetParent[GET_BOUNDING_CLIENT_RECT]()[attr];
                                        offset = node[GET_BOUNDING_CLIENT_RECT]()[attr];
                                        if (attr === 'left' || attr === 'top') {
                                            val = offset - parentOffset;
                                        } else {
                                            val = parentOffset - node[GET_BOUNDING_CLIENT_RECT]()[attr];
                                        }
                                    }
                                }
                            
                                return val;
                            };
                            
                            Y.DOM._getOffset = function(node, dir) {
                                var pos,
                                    xy = null,
                                    offset = {
                                        left: 'offsetLeft',
                                        right: 'offsetRight'
                                    },
                                    margins = {
                                        left: 'marginLeft',
                                        right: 'marginRight'
                                    },
                                    margin;
                            
                                dir = dir || 'left';
                            
                                if (node) {
                                    pos = Y_DOM.getStyle(node, 'position');
                                    margin = parseInt(Y_DOM[GET_COMPUTED_STYLE](node, margins[dir]), 10);
                                    xy = [
                                        parseInt(Y_DOM[GET_COMPUTED_STYLE](node, dir), 10),
                                        parseInt(Y_DOM[GET_COMPUTED_STYLE](node, 'top'), 10)
                                    ];
                            
                                    if ( isNaN(xy[0]) ) { // in case of 'auto'
                                        xy[0] = parseInt(Y_DOM.getStyle(node, dir), 10); // try inline
                                        if ( isNaN(xy[0]) ) { // default to offset value
                                            xy[0] = (pos === 'relative') ? 0 : (node[offset[dir]] - margin) || 0;
                                        }
                                    }
                            
                                    if ( isNaN(xy[1]) ) { // in case of 'auto'
                                        xy[1] = parseInt(Y_DOM.getStyle(node, 'top'), 10); // try inline
                                        if ( isNaN(xy[1]) ) { // default to offset value
                                            xy[1] = (pos === 'relative') ? 0 : node.offsetTop || 0;
                                        }
                                    }
                                }
                            
                                return xy;
                            
                            };
                            
                            if (TRANSFORM) {
                                Y_DOM.CUSTOM_STYLES.transform = {
                                    set: function(node, val, style) {
                                        style[TRANSFORM] = val;
                                    },
                            
                                    get: function(node) {
                                        return Y_DOM[GET_COMPUTED_STYLE](node, TRANSFORM);
                                    }
                                };
                            
                                Y_DOM.CUSTOM_STYLES.transformOrigin = {
                                    set: function(node, val, style) {
                                        style[TRANSFORMORIGIN] = val;
                                    },
                            
                                    get: function(node) {
                                        return Y_DOM[GET_COMPUTED_STYLE](node, TRANSFORMORIGIN);
                                    }
                                };
                            }