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                            /**
                            * Provides the base Transition class, for animating numeric properties.
                            *
                            * @module transition
                            * @submodule transition-timer
                            */
                            
                            
                            var Transition = Y.Transition;
                            
                            Y.mix(Transition.prototype, {
                                _start: function() {
                                    if (Transition.useNative) {
                                        this._runNative();
                                    } else {
                                        this._runTimer();
                                    }
                                },
                            
                                _runTimer: function() {
                                    var anim = this;
                                    anim._initAttrs();
                            
                                    Transition._running[Y.stamp(anim)] = anim;
                                    anim._startTime = new Date();
                                    Transition._startTimer();
                                },
                            
                                _endTimer: function() {
                                    var anim = this;
                                    delete Transition._running[Y.stamp(anim)];
                                    anim._startTime = null;
                                },
                            
                                _runFrame: function() {
                                    var t = new Date() - this._startTime;
                                    this._runAttrs(t);
                                },
                            
                                _runAttrs: function(time) {
                                    var anim = this,
                                        node = anim._node,
                                        config = anim._config,
                                        uid = Y.stamp(node),
                                        attrs = Transition._nodeAttrs[uid],
                                        customAttr = Transition.behaviors,
                                        done = false,
                                        allDone = false,
                                        data,
                                        name,
                                        attribute,
                                        setter,
                                        elapsed,
                                        delay,
                                        d,
                                        t,
                                        i;
                            
                                    for (name in attrs) {
                                        if ((attribute = attrs[name]) && attribute.transition === anim) {
                                            d = attribute.duration;
                                            delay = attribute.delay;
                                            elapsed = (time - delay) / 1000;
                                            t = time;
                                            data = {
                                                type: 'propertyEnd',
                                                propertyName: name,
                                                config: config,
                                                elapsedTime: elapsed
                                            };
                            
                                            setter = (i in customAttr && 'set' in customAttr[i]) ?
                                                    customAttr[i].set : Transition.DEFAULT_SETTER;
                            
                                            done = (t >= d);
                            
                                            if (t > d) {
                                                t = d;
                                            }
                            
                                            if (!delay || time >= delay) {
                                                setter(anim, name, attribute.from, attribute.to, t - delay, d - delay,
                                                    attribute.easing, attribute.unit);
                            
                                                if (done) {
                                                    delete attrs[name];
                                                    anim._count--;
                            
                                                    if (config[name] && config[name].on && config[name].on.end) {
                                                        config[name].on.end.call(Y.one(node), data);
                                                    }
                            
                                                    //node.fire('transition:propertyEnd', data);
                            
                                                    if (!allDone && anim._count <= 0) {
                                                        allDone = true;
                                                        anim._end(elapsed);
                                                        anim._endTimer();
                                                    }
                                                }
                                            }
                            
                                        }
                                    }
                                },
                            
                                _initAttrs: function() {
                                    var anim = this,
                                        customAttr = Transition.behaviors,
                                        uid = Y.stamp(anim._node),
                                        attrs = Transition._nodeAttrs[uid],
                                        attribute,
                                        duration,
                                        delay,
                                        easing,
                                        val,
                                        name,
                                        mTo,
                                        mFrom,
                                        unit, begin, end;
                            
                                    for (name in attrs) {
                                        if ((attribute = attrs[name]) && attribute.transition === anim) {
                                            duration = attribute.duration * 1000;
                                            delay = attribute.delay * 1000;
                                            easing = attribute.easing;
                                            val = attribute.value;
                            
                                            // only allow supported properties
                                            if (name in anim._node.style || name in Y.DOM.CUSTOM_STYLES) {
                                                begin = (name in customAttr && 'get' in customAttr[name])  ?
                                                        customAttr[name].get(anim, name) : Transition.DEFAULT_GETTER(anim, name);
                            
                                                mFrom = Transition.RE_UNITS.exec(begin);
                                                mTo = Transition.RE_UNITS.exec(val);
                            
                                                begin = mFrom ? mFrom[1] : begin;
                                                end = mTo ? mTo[1] : val;
                                                unit = mTo ? mTo[2] : mFrom ?  mFrom[2] : ''; // one might be zero TODO: mixed units
                            
                                                if (!unit && Transition.RE_DEFAULT_UNIT.test(name)) {
                                                    unit = Transition.DEFAULT_UNIT;
                                                }
                            
                                                if (typeof easing === 'string') {
                                                    if (easing.indexOf('cubic-bezier') > -1) {
                                                        easing = easing.substring(13, easing.length - 1).split(',');
                                                    } else if (Transition.easings[easing]) {
                                                        easing = Transition.easings[easing];
                                                    }
                                                }
                            
                                                attribute.from = Number(begin);
                                                attribute.to = Number(end);
                                                attribute.unit = unit;
                                                attribute.easing = easing;
                                                attribute.duration = duration + delay;
                                                attribute.delay = delay;
                                            } else {
                                                delete attrs[name];
                                                anim._count--;
                                            }
                                        }
                                    }
                                },
                            
                                destroy: function() {
                                    this.detachAll();
                                    this._node = null;
                                }
                            }, true);
                            
                            Y.mix(Y.Transition, {
                                _runtimeAttrs: {},
                                /*
                                 * Regex of properties that should use the default unit.
                                 *
                                 * @property RE_DEFAULT_UNIT
                                 * @static
                                 */
                                RE_DEFAULT_UNIT: /^width|height|top|right|bottom|left|margin.*|padding.*|border.*$/i,
                            
                                /*
                                 * The default unit to use with properties that pass the RE_DEFAULT_UNIT test.
                                 *
                                 * @property DEFAULT_UNIT
                                 * @static
                                 */
                                DEFAULT_UNIT: 'px',
                            
                                /*
                                 * Time in milliseconds passed to setInterval for frame processing
                                 *
                                 * @property intervalTime
                                 * @default 20
                                 * @static
                                 */
                                intervalTime: 20,
                            
                                /*
                                 * Bucket for custom getters and setters
                                 *
                                 * @property behaviors
                                 * @static
                                 */
                                behaviors: {
                                    left: {
                                        get: function(anim, attr) {
                                            return Y.DOM._getAttrOffset(anim._node, attr);
                                        }
                                    }
                                },
                            
                                /*
                                 * The default setter to use when setting object properties.
                                 *
                                 * @property DEFAULT_SETTER
                                 * @static
                                 */
                                DEFAULT_SETTER: function(anim, att, from, to, elapsed, duration, fn, unit) {
                                    from = Number(from);
                                    to = Number(to);
                            
                                    var node = anim._node,
                                        val = Transition.cubicBezier(fn, elapsed / duration);
                            
                                    val = from + val[0] * (to - from);
                            
                                    if (node) {
                                        if (att in node.style || att in Y.DOM.CUSTOM_STYLES) {
                                            unit = unit || '';
                                            Y.DOM.setStyle(node, att, val + unit);
                                        }
                                    } else {
                                        anim._end();
                                    }
                                },
                            
                                /*
                                 * The default getter to use when getting object properties.
                                 *
                                 * @property DEFAULT_GETTER
                                 * @static
                                 */
                                DEFAULT_GETTER: function(anim, att) {
                                    var node = anim._node,
                                        val = '';
                            
                                    if (att in node.style || att in Y.DOM.CUSTOM_STYLES) {
                                        val = Y.DOM.getComputedStyle(node, att);
                                    }
                            
                                    return val;
                                },
                            
                                _startTimer: function() {
                                    if (!Transition._timer) {
                                        Transition._timer = setInterval(Transition._runFrame, Transition.intervalTime);
                                    }
                                },
                            
                                _stopTimer: function() {
                                    clearInterval(Transition._timer);
                                    Transition._timer = null;
                                },
                            
                                /*
                                 * Called per Interval to handle each animation frame.
                                 * @method _runFrame
                                 * @private
                                 * @static
                                 */
                                _runFrame: function() {
                                    var done = true,
                                        anim;
                                    for (anim in Transition._running) {
                                        if (Transition._running[anim]._runFrame) {
                                            done = false;
                                            Transition._running[anim]._runFrame();
                                        }
                                    }
                            
                                    if (done) {
                                        Transition._stopTimer();
                                    }
                                },
                            
                                cubicBezier: function(p, t) {
                                    var x0 = 0,
                                        y0 = 0,
                                        x1 = p[0],
                                        y1 = p[1],
                                        x2 = p[2],
                                        y2 = p[3],
                                        x3 = 1,
                                        y3 = 0,
                            
                                        A = x3 - 3 * x2 + 3 * x1 - x0,
                                        B = 3 * x2 - 6 * x1 + 3 * x0,
                                        C = 3 * x1 - 3 * x0,
                                        D = x0,
                                        E = y3 - 3 * y2 + 3 * y1 - y0,
                                        F = 3 * y2 - 6 * y1 + 3 * y0,
                                        G = 3 * y1 - 3 * y0,
                                        H = y0,
                            
                                        x = (((A*t) + B)*t + C)*t + D,
                                        y = (((E*t) + F)*t + G)*t + H;
                            
                                    return [x, y];
                                },
                            
                                easings: {
                                    ease: [0.25, 0, 1, 0.25],
                                    linear: [0, 0, 1, 1],
                                    'ease-in': [0.42, 0, 1, 1],
                                    'ease-out': [0, 0, 0.58, 1],
                                    'ease-in-out': [0.42, 0, 0.58, 1]
                                },
                            
                                _running: {},
                                _timer: null,
                            
                                RE_UNITS: /^(-?\d*\.?\d*){1}(em|ex|px|in|cm|mm|pt|pc|%)*$/
                            }, true);
                            
                            Transition.behaviors.top = Transition.behaviors.bottom = Transition.behaviors.right = Transition.behaviors.left;
                            
                            Y.Transition = Transition;