text: /*!
   * skrollr core
   *
   * Alexander Prinzhorn - https://github.com/Prinzhorn/skrollr
   *
   * Free to use under terms of MIT license
   */
  (function(window, document, undefined) {
  	'use strict';
  
  	/*
  	 * Global api.
  	 */
  	var skrollr = window.skrollr = {
  		get: function() {
  			return _instance;
  		},
  		//Main entry point.
  		init: function(options) {
  			return _instance || new Skrollr(options);
  		},
  		VERSION: '0.6.17'
  	};
  
  	//Minify optimization.
  	var hasProp = Object.prototype.hasOwnProperty;
  	var Math = window.Math;
  	var getStyle = window.getComputedStyle;
  
  	//They will be filled when skrollr gets initialized.
  	var documentElement;
  	var body;
  
  	var EVENT_TOUCHSTART = 'touchstart';
  	var EVENT_TOUCHMOVE = 'touchmove';
  	var EVENT_TOUCHCANCEL = 'touchcancel';
  	var EVENT_TOUCHEND = 'touchend';
  
  	var SKROLLABLE_CLASS = 'skrollable';
  	var SKROLLABLE_BEFORE_CLASS = SKROLLABLE_CLASS + '-before';
  	var SKROLLABLE_BETWEEN_CLASS = SKROLLABLE_CLASS + '-between';
  	var SKROLLABLE_AFTER_CLASS = SKROLLABLE_CLASS + '-after';
  
  	var SKROLLR_CLASS = 'skrollr';
  	var NO_SKROLLR_CLASS = 'no-' + SKROLLR_CLASS;
  	var SKROLLR_DESKTOP_CLASS = SKROLLR_CLASS + '-desktop';
  	var SKROLLR_MOBILE_CLASS = SKROLLR_CLASS + '-mobile';
  
  	var DEFAULT_EASING = 'linear';
  	var DEFAULT_DURATION = 1000;//ms
  	var DEFAULT_MOBILE_DECELERATION = 0.004;//pixel/ms²
  
  	var DEFAULT_SMOOTH_SCROLLING_DURATION = 200;//ms
  
  	var ANCHOR_START = 'start';
  	var ANCHOR_END = 'end';
  	var ANCHOR_CENTER = 'center';
  	var ANCHOR_BOTTOM = 'bottom';
  
  	//The property which will be added to the DOM element to hold the ID of the skrollable.
  	var SKROLLABLE_ID_DOM_PROPERTY = '___skrollable_id';
  
  	var rxTouchIgnoreTags = /^(?:input|textarea|button|select)$/i;
  
  	var rxTrim = /^\s+|\s+$/g;
  
  	//Find all data-attributes. data-[_constant]-[offset]-[anchor]-[anchor].
  	var rxKeyframeAttribute = /^data(?:-(_\w+))?(?:-?(-?\d*\.?\d+p?))?(?:-?(start|end|top|center|bottom))?(?:-?(top|center|bottom))?$/;
  
  	var rxPropValue = /\s*([\w\-\[\]]+)\s*:\s*(.+?)\s*(?:;|$)/gi;
  
  	//Easing function names follow the property in square brackets.
  	var rxPropEasing = /^([a-z\-]+)\[(\w+)\]$/;
  
  	var rxCamelCase = /-([a-z])/g;
  	var rxCamelCaseFn = function(str, letter) {
  		return letter.toUpperCase();
  	};
  
  	//Numeric values with optional sign.
  	var rxNumericValue = /[\-+]?[\d]*\.?[\d]+/g;
  
  	//Used to replace occurences of {?} with a number.
  	var rxInterpolateString = /\{\?\}/g;
  
  	//Finds rgb(a) colors, which don't use the percentage notation.
  	var rxRGBAIntegerColor = /rgba?\(\s*-?\d+\s*,\s*-?\d+\s*,\s*-?\d+/g;
  
  	//Finds all gradients.
  	var rxGradient = /[a-z\-]+-gradient/g;
  
  	//Vendor prefix. Will be set once skrollr gets initialized.
  	var theCSSPrefix = '';
  	var theDashedCSSPrefix = '';
  
  	//Will be called once (when skrollr gets initialized).
  	var detectCSSPrefix = function() {
  		//Only relevant prefixes. May be extended.
  		//Could be dangerous if there will ever be a CSS property which actually starts with "ms". Don't hope so.
  		var rxPrefixes = /^(?:O|Moz|webkit|ms)|(?:-(?:o|moz|webkit|ms)-)/;
  
  		//Detect prefix for current browser by finding the first property using a prefix.
  		if(!getStyle) {
  			return;
  		}
  
  		var style = getStyle(body, null);
  
  		for(var k in style) {
  			//We check the key and if the key is a number, we check the value as well, because safari's getComputedStyle returns some weird array-like thingy.
  			theCSSPrefix = (k.match(rxPrefixes) || (+k == k && style[k].match(rxPrefixes)));
  
  			if(theCSSPrefix) {
  				break;
  			}
  		}
  
  		//Did we even detect a prefix?
  		if(!theCSSPrefix) {
  			theCSSPrefix = theDashedCSSPrefix = '';
  
  			return;
  		}
  
  		theCSSPrefix = theCSSPrefix[0];
  
  		//We could have detected either a dashed prefix or this camelCaseish-inconsistent stuff.
  		if(theCSSPrefix.slice(0,1) === '-') {
  			theDashedCSSPrefix = theCSSPrefix;
  
  			//There's no logic behind these. Need a look up.
  			theCSSPrefix = ({
  				'-webkit-': 'webkit',
  				'-moz-': 'Moz',
  				'-ms-': 'ms',
  				'-o-': 'O'
  			})[theCSSPrefix];
  		} else {
  			theDashedCSSPrefix = '-' + theCSSPrefix.toLowerCase() + '-';
  		}
  	};
  
  	var polyfillRAF = function() {
  		var requestAnimFrame = window.requestAnimationFrame || window[theCSSPrefix.toLowerCase() + 'RequestAnimationFrame'];
  
  		var lastTime = _now();
  
  		if(_isMobile || !requestAnimFrame) {
  			requestAnimFrame = function(callback) {
  				//How long did it take to render?
  				var deltaTime = _now() - lastTime;
  				var delay = Math.max(0, 1000 / 60 - deltaTime);
  
  				return window.setTimeout(function() {
  					lastTime = _now();
  					callback();
  				}, delay);
  			};
  		}
  
  		return requestAnimFrame;
  	};
  
  	var polyfillCAF = function() {
  		var cancelAnimFrame = window.cancelAnimationFrame || window[theCSSPrefix.toLowerCase() + 'CancelAnimationFrame'];
  
  		if(_isMobile || !cancelAnimFrame) {
  			cancelAnimFrame = function(timeout) {
  				return window.clearTimeout(timeout);
  			};
  		}
  
  		return cancelAnimFrame;
  	};
  
  	//Built-in easing functions.
  	var easings = {
  		begin: function() {
  			return 0;
  		},
  		end: function() {
  			return 1;
  		},
  		linear: function(p) {
  			return p;
  		},
  		quadratic: function(p) {
  			return p * p;
  		},
  		cubic: function(p) {
  			return p * p * p;
  		},
  		swing: function(p) {
  			return (-Math.cos(p * Math.PI) / 2) + 0.5;
  		},
  		sqrt: function(p) {
  			return Math.sqrt(p);
  		},
  		outCubic: function(p) {
  			return (Math.pow((p - 1), 3) + 1);
  		},
  		//see https://www.desmos.com/calculator/tbr20s8vd2 for how I did this
  		bounce: function(p) {
  			var a;
  
  			if(p <= 0.5083) {
  				a = 3;
  			} else if(p <= 0.8489) {
  				a = 9;
  			} else if(p <= 0.96208) {
  				a = 27;
  			} else if(p <= 0.99981) {
  				a = 91;
  			} else {
  				return 1;
  			}
  
  			return 1 - Math.abs(3 * Math.cos(p * a * 1.028) / a);
  		}
  	};
  
  	/**
  	 * Constructor.
  	 */
  	function Skrollr(options) {
  		documentElement = document.documentElement;
  		body = document.body;
  
  		detectCSSPrefix();
  
  		_instance = this;
  
  		options = options || {};
  
  		_constants = options.constants || {};
  
  		//We allow defining custom easings or overwrite existing.
  		if(options.easing) {
  			for(var e in options.easing) {
  				easings[e] = options.easing[e];
  			}
  		}
  
  		_edgeStrategy = options.edgeStrategy || 'set';
  
  		_listeners = {
  			//Function to be called right before rendering.
  			beforerender: options.beforerender,
  
  			//Function to be called right after finishing rendering.
  			render: options.render
  		};
  
  		//forceHeight is true by default
  		_forceHeight = options.forceHeight !== false;
  
  		if(_forceHeight) {
  			_scale = options.scale || 1;
  		}
  
  		_mobileDeceleration = options.mobileDeceleration || DEFAULT_MOBILE_DECELERATION;
  
  		_smoothScrollingEnabled = options.smoothScrolling !== false;
  		_smoothScrollingDuration = options.smoothScrollingDuration || DEFAULT_SMOOTH_SCROLLING_DURATION;
  
  		//Dummy object. Will be overwritten in the _render method when smooth scrolling is calculated.
  		_smoothScrolling = {
  			targetTop: _instance.getScrollTop()
  		};
  
  		//A custom check function may be passed.
  		_isMobile = ((options.mobileCheck || function() {
  			return (/Android|iPhone|iPad|iPod|BlackBerry|Windows Phone/i).test(navigator.userAgent || navigator.vendor || window.opera);
  		})());
  
  		if(_isMobile) {
  			_skrollrBody = document.getElementById('skrollr-body');
  
  			//Detect 3d transform if there's a skrollr-body (only needed for #skrollr-body).
  			if(_skrollrBody) {
  				_detect3DTransforms();
  			}
  
  			_initMobile();
  			_updateClass(documentElement, [SKROLLR_CLASS, SKROLLR_MOBILE_CLASS], [NO_SKROLLR_CLASS]);
  		} else {
  			_updateClass(documentElement, [SKROLLR_CLASS, SKROLLR_DESKTOP_CLASS], [NO_SKROLLR_CLASS]);
  		}
  
  		//Triggers parsing of elements and a first reflow.
  		_instance.refresh();
  
  		_addEvent(window, 'resize orientationchange', function() {
  			var width = documentElement.clientWidth;
  			var height = documentElement.clientHeight;
  
  			//Only reflow if the size actually changed (#271).
  			if(height !== _lastViewportHeight || width !== _lastViewportWidth) {
  				_lastViewportHeight = height;
  				_lastViewportWidth = width;
  
  				_requestReflow = true;
  			}
  		});
  
  		var requestAnimFrame = polyfillRAF();
  
  		//Let's go.
  		(function animloop(){
  			_render();
  			_animFrame = requestAnimFrame(animloop);
  		}());
  
  		return _instance;
  	}
  
  	/**
  	 * (Re)parses some or all elements.
  	 */
  	Skrollr.prototype.refresh = function(elements) {
  		var elementIndex;
  		var elementsLength;
  		var ignoreID = false;
  
  		//Completely reparse anything without argument.
  		if(elements === undefined) {
  			//Ignore that some elements may already have a skrollable ID.
  			ignoreID = true;
  
  			_skrollables = [];
  			_skrollableIdCounter = 0;
  
  			elements = document.getElementsByTagName('*');
  		} else {
  			//We accept a single element or an array of elements.
  			elements = [].concat(elements);
  		}
  
  		elementIndex = 0;
  		elementsLength = elements.length;
  
  		for(; elementIndex < elementsLength; elementIndex++) {
  			var el = elements[elementIndex];
  			var anchorTarget = el;
  			var keyFrames = [];
  
  			//If this particular element should be smooth scrolled.
  			var smoothScrollThis = _smoothScrollingEnabled;
  
  			//The edge strategy for this particular element.
  			var edgeStrategy = _edgeStrategy;
  
  			if(!el.attributes) {
  				continue;
  			}
  
  			//Iterate over all attributes and search for key frame attributes.
  			var attributeIndex = 0;
  			var attributesLength = el.attributes.length;
  
  			for (; attributeIndex < attributesLength; attributeIndex++) {
  				var attr = el.attributes[attributeIndex];
  
  				if(attr.name === 'data-anchor-target') {
  					anchorTarget = document.querySelector(attr.value);
  
  					if(anchorTarget === null) {
  						throw 'Unable to find anchor target "' + attr.value + '"';
  					}
  
  					continue;
  				}
  
  				//Global smooth scrolling can be overridden by the element attribute.
  				if(attr.name === 'data-smooth-scrolling') {
  					smoothScrollThis = attr.value !== 'off';
  
  					continue;
  				}
  
  				//Global edge strategy can be overridden by the element attribute.
  				if(attr.name === 'data-edge-strategy') {
  					edgeStrategy = attr.value;
  
  					continue;
  				}
  
  				var match = attr.name.match(rxKeyframeAttribute);
  
  				if(match === null) {
  					continue;
  				}
  
  				var kf = {
  					props: attr.value,
  					//Point back to the element as well.
  					element: el
  				};
  
  				keyFrames.push(kf);
  
  				var constant = match[1];
  
  				//If there is a constant, get it's value or fall back to 0.
  				constant = constant && _constants[constant.substr(1)] || 0;
  
  				//Parse key frame offset. If undefined will be casted to 0.
  				var offset = match[2];
  
  				//Is it a percentage offset?
  				if(/p$/.test(offset)) {
  					kf.isPercentage = true;
  					kf.offset = ((offset.slice(0, -1) | 0) + constant) / 100;
  				} else {
  					kf.offset = (offset | 0) + constant;
  				}
  
  				var anchor1 = match[3];
  
  				//If second anchor is not set, the first will be taken for both.
  				var anchor2 = match[4] || anchor1;
  
  				//"absolute" (or "classic") mode, where numbers mean absolute scroll offset.
  				if(!anchor1 || anchor1 === ANCHOR_START || anchor1 === ANCHOR_END) {
  					kf.mode = 'absolute';
  
  					//data-end needs to be calculated after all key frames are known.
  					if(anchor1 === ANCHOR_END) {
  						kf.isEnd = true;
  					} else if(!kf.isPercentage) {
  						//For data-start we can already set the key frame w/o calculations.
  						//#59: "scale" options should only affect absolute mode.
  						kf.frame = kf.offset * _scale;
  
  						delete kf.offset;
  					}
  				}
  				//"relative" mode, where numbers are relative to anchors.
  				else {
  					kf.mode = 'relative';
  					kf.anchors = [anchor1, anchor2];
  				}
  			}
  
  			//Does this element have key frames?
  			if(!keyFrames.length) {
  				continue;
  			}
  
  			//Will hold the original style and class attributes before we controlled the element (see #80).
  			var styleAttr, classAttr;
  
  			var id;
  
  			if(!ignoreID && SKROLLABLE_ID_DOM_PROPERTY in el) {
  				//We already have this element under control. Grab the corresponding skrollable id.
  				id = el[SKROLLABLE_ID_DOM_PROPERTY];
  				styleAttr = _skrollables[id].styleAttr;
  				classAttr = _skrollables[id].classAttr;
  			} else {
  				//It's an unknown element. Asign it a new skrollable id.
  				id = (el[SKROLLABLE_ID_DOM_PROPERTY] = _skrollableIdCounter++);
  				styleAttr = el.style.cssText;
  				classAttr = _getClass(el);
  			}
  
  			_skrollables[id] = {
  				element: el,
  				styleAttr: styleAttr,
  				classAttr: classAttr,
  				anchorTarget: anchorTarget,
  				keyFrames: keyFrames,
  				smoothScrolling: smoothScrollThis,
  				edgeStrategy: edgeStrategy
  			};
  
  			_updateClass(el, [SKROLLABLE_CLASS], []);
  		}
  
  		//Reflow for the first time.
  		_reflow();
  
  		//Now that we got all key frame numbers right, actually parse the properties.
  		elementIndex = 0;
  		elementsLength = elements.length;
  
  		for(; elementIndex < elementsLength; elementIndex++) {
  			var sk = _skrollables[elements[elementIndex][SKROLLABLE_ID_DOM_PROPERTY]];
  
  			if(sk === undefined) {
  				continue;
  			}
  
  			//Parse the property string to objects
  			_parseProps(sk);
  
  			//Fill key frames with missing properties from left and right
  			_fillProps(sk);
  		}
  
  		return _instance;
  	};
  
  	/**
  	 * Transform "relative" mode to "absolute" mode.
  	 * That is, calculate anchor position and offset of element.
  	 */
  	Skrollr.prototype.relativeToAbsolute = function(element, viewportAnchor, elementAnchor) {
  		var viewportHeight = documentElement.clientHeight;
  		var box = element.getBoundingClientRect();
  		var absolute = box.top;
  
  		//#100: IE doesn't supply "height" with getBoundingClientRect.
  		var boxHeight = box.bottom - box.top;
  
  		if(viewportAnchor === ANCHOR_BOTTOM) {
  			absolute -= viewportHeight;
  		} else if(viewportAnchor === ANCHOR_CENTER) {
  			absolute -= viewportHeight / 2;
  		}
  
  		if(elementAnchor === ANCHOR_BOTTOM) {
  			absolute += boxHeight;
  		} else if(elementAnchor === ANCHOR_CENTER) {
  			absolute += boxHeight / 2;
  		}
  
  		//Compensate scrolling since getBoundingClientRect is relative to viewport.
  		absolute += _instance.getScrollTop();
  
  		return (absolute + 0.5) | 0;
  	};
  
  	/**
  	 * Animates scroll top to new position.
  	 */
  	Skrollr.prototype.animateTo = function(top, options) {
  		options = options || {};
  
  		var now = _now();
  		var scrollTop = _instance.getScrollTop();
  
  		//Setting this to a new value will automatically cause the current animation to stop, if any.
  		_scrollAnimation = {
  			startTop: scrollTop,
  			topDiff: top - scrollTop,
  			targetTop: top,
  			duration: options.duration || DEFAULT_DURATION,
  			startTime: now,
  			endTime: now + (options.duration || DEFAULT_DURATION),
  			easing: easings[options.easing || DEFAULT_EASING],
  			done: options.done
  		};
  
  		//Don't queue the animation if there's nothing to animate.
  		if(!_scrollAnimation.topDiff) {
  			if(_scrollAnimation.done) {
  				_scrollAnimation.done.call(_instance, false);
  			}
  
  			_scrollAnimation = undefined;
  		}
  
  		return _instance;
  	};
  
  	/**
  	 * Stops animateTo animation.
  	 */
  	Skrollr.prototype.stopAnimateTo = function() {
  		if(_scrollAnimation && _scrollAnimation.done) {
  			_scrollAnimation.done.call(_instance, true);
  		}
  
  		_scrollAnimation = undefined;
  	};
  
  	/**
  	 * Returns if an animation caused by animateTo is currently running.
  	 */
  	Skrollr.prototype.isAnimatingTo = function() {
  		return !!_scrollAnimation;
  	};
  
  	Skrollr.prototype.setScrollTop = function(top, force) {
  		_forceRender = (force === true);
  
  		if(_isMobile) {
  			_mobileOffset = Math.min(Math.max(top, 0), _maxKeyFrame);
  		} else {
  			window.scrollTo(0, top);
  		}
  
  		return _instance;
  	};
  
  	Skrollr.prototype.getScrollTop = function() {
  		if(_isMobile) {
  			return _mobileOffset;
  		} else {
  			return window.pageYOffset || documentElement.scrollTop || body.scrollTop || 0;
  		}
  	};
  
  	Skrollr.prototype.getMaxScrollTop = function() {
  		return _maxKeyFrame;
  	};
  
  	Skrollr.prototype.on = function(name, fn) {
  		_listeners[name] = fn;
  
  		return _instance;
  	};
  
  	Skrollr.prototype.off = function(name) {
  		delete _listeners[name];
  
  		return _instance;
  	};
  
  	Skrollr.prototype.destroy = function() {
  		var cancelAnimFrame = polyfillCAF();
  		cancelAnimFrame(_animFrame);
  		_removeAllEvents();
  
  		_updateClass(documentElement, [NO_SKROLLR_CLASS], [SKROLLR_CLASS, SKROLLR_DESKTOP_CLASS, SKROLLR_MOBILE_CLASS]);
  
  		var skrollableIndex = 0;
  		var skrollablesLength = _skrollables.length;
  
  		for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
  			_reset(_skrollables[skrollableIndex].element);
  		}
  
  		documentElement.style.overflow = body.style.overflow = 'auto';
  		documentElement.style.height = body.style.height = 'auto';
  
  		if(_skrollrBody) {
  			skrollr.setStyle(_skrollrBody, 'transform', 'none');
  		}
  
  		_instance = undefined;
  		_skrollrBody = undefined;
  		_listeners = undefined;
  		_forceHeight = undefined;
  		_maxKeyFrame = 0;
  		_scale = 1;
  		_constants = undefined;
  		_mobileDeceleration = undefined;
  		_direction = 'down';
  		_lastTop = -1;
  		_lastViewportWidth = 0;
  		_lastViewportHeight = 0;
  		_requestReflow = false;
  		_scrollAnimation = undefined;
  		_smoothScrollingEnabled = undefined;
  		_smoothScrollingDuration = undefined;
  		_smoothScrolling = undefined;
  		_forceRender = undefined;
  		_skrollableIdCounter = 0;
  		_edgeStrategy = undefined;
  		_isMobile = false;
  		_mobileOffset = 0;
  		_translateZ = undefined;
  	};
  
  	/*
  		Private methods.
  	*/
  
  	var _initMobile = function() {
  		var initialElement;
  		var initialTouchY;
  		var initialTouchX;
  		var currentElement;
  		var currentTouchY;
  		var currentTouchX;
  		var lastTouchY;
  		var deltaY;
  
  		var initialTouchTime;
  		var currentTouchTime;
  		var lastTouchTime;
  		var deltaTime;
  
  		_addEvent(documentElement, [EVENT_TOUCHSTART, EVENT_TOUCHMOVE, EVENT_TOUCHCANCEL, EVENT_TOUCHEND].join(' '), function(e) {
  			var touch = e.changedTouches[0];
  
  			currentElement = e.target;
  
  			//We don't want text nodes.
  			while(currentElement.nodeType === 3) {
  				currentElement = currentElement.parentNode;
  			}
  
  			currentTouchY = touch.clientY;
  			currentTouchX = touch.clientX;
  			currentTouchTime = e.timeStamp;
  
  			if(!rxTouchIgnoreTags.test(currentElement.tagName)) {
  				e.preventDefault();
  			}
  
  			switch(e.type) {
  				case EVENT_TOUCHSTART:
  					//The last element we tapped on.
  					if(initialElement) {
  						initialElement.blur();
  					}
  
  					_instance.stopAnimateTo();
  
  					initialElement = currentElement;
  
  					initialTouchY = lastTouchY = currentTouchY;
  					initialTouchX = currentTouchX;
  					initialTouchTime = currentTouchTime;
  
  					break;
  				case EVENT_TOUCHMOVE:
  					deltaY = currentTouchY - lastTouchY;
  					deltaTime = currentTouchTime - lastTouchTime;
  
  					_instance.setScrollTop(_mobileOffset - deltaY, true);
  
  					lastTouchY = currentTouchY;
  					lastTouchTime = currentTouchTime;
  					break;
  				default:
  				case EVENT_TOUCHCANCEL:
  				case EVENT_TOUCHEND:
  					var distanceY = initialTouchY - currentTouchY;
  					var distanceX = initialTouchX - currentTouchX;
  					var distance2 = distanceX * distanceX + distanceY * distanceY;
  
  					//Check if it was more like a tap (moved less than 7px).
  					if(distance2 < 49) {
  						if(!rxTouchIgnoreTags.test(initialElement.tagName)) {
  							initialElement.focus();
  
  							//It was a tap, click the element.
  							var clickEvent = document.createEvent('MouseEvents');
  							clickEvent.initMouseEvent('click', true, true, e.view, 1, touch.screenX, touch.screenY, touch.clientX, touch.clientY, e.ctrlKey, e.altKey, e.shiftKey, e.metaKey, 0, null);
  							initialElement.dispatchEvent(clickEvent);
  						}
  
  						return;
  					}
  
  					initialElement = undefined;
  
  					var speed = deltaY / deltaTime;
  
  					//Cap speed at 3 pixel/ms.
  					speed = Math.max(Math.min(speed, 3), -3);
  
  					var duration = Math.abs(speed / _mobileDeceleration);
  					var targetOffset = speed * duration + 0.5 * _mobileDeceleration * duration * duration;
  					var targetTop = _instance.getScrollTop() - targetOffset;
  
  					//Relative duration change for when scrolling above bounds.
  					var targetRatio = 0;
  
  					//Change duration proportionally when scrolling would leave bounds.
  					if(targetTop > _maxKeyFrame) {
  						targetRatio = (_maxKeyFrame - targetTop) / targetOffset;
  
  						targetTop = _maxKeyFrame;
  					} else if(targetTop < 0) {
  						targetRatio = -targetTop / targetOffset;
  
  						targetTop = 0;
  					}
  
  					duration = duration * (1 - targetRatio);
  
  					_instance.animateTo((targetTop + 0.5) | 0, {easing: 'outCubic', duration: duration});
  					break;
  			}
  		});
  
  		//Just in case there has already been some native scrolling, reset it.
  		window.scrollTo(0, 0);
  		documentElement.style.overflow = body.style.overflow = 'hidden';
  	};
  
  	/**
  	 * Updates key frames which depend on others.
  	 * That is "end" in "absolute" mode and all key frames in "relative" mode.
  	 */
  	var _updateDependentKeyFrames = function() {
  		var skrollable;
  		var element;
  		var anchorTarget;
  		var keyFrames;
  		var keyFrameIndex;
  		var keyFramesLength;
  		var kf;
  		var skrollableIndex;
  		var skrollablesLength;
  
  		//First process all relative-mode elements and find the max key frame.
  		skrollableIndex = 0;
  		skrollablesLength = _skrollables.length;
  
  		for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
  			skrollable = _skrollables[skrollableIndex];
  			element = skrollable.element;
  			anchorTarget = skrollable.anchorTarget;
  			keyFrames = skrollable.keyFrames;
  
  			keyFrameIndex = 0;
  			keyFramesLength = keyFrames.length;
  
  			for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
  				kf = keyFrames[keyFrameIndex];
  
  				var offset = kf.offset;
  
  				if(kf.isPercentage) {
  					//Convert the offset to percentage of the viewport height.
  					offset = offset * documentElement.clientHeight;
  
  					//Absolute + percentage mode.
  					kf.frame = offset;
  				}
  
  				if(kf.mode === 'relative') {
  					_reset(element);
  
  					kf.frame = _instance.relativeToAbsolute(anchorTarget, kf.anchors[0], kf.anchors[1]) - offset;
  
  					_reset(element, true);
  				}
  
  				//Only search for max key frame when forceHeight is enabled.
  				if(_forceHeight) {
  					//Find the max key frame, but don't use one of the data-end ones for comparison.
  					if(!kf.isEnd && kf.frame > _maxKeyFrame) {
  						_maxKeyFrame = kf.frame;
  					}
  				}
  			}
  		}
  
  		//#133: The document can be larger than the maxKeyFrame we found.
  		_maxKeyFrame = Math.max(_maxKeyFrame, _getDocumentHeight());
  
  		//Now process all data-end keyframes.
  		skrollableIndex = 0;
  		skrollablesLength = _skrollables.length;
  
  		for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
  			skrollable = _skrollables[skrollableIndex];
  			keyFrames = skrollable.keyFrames;
  
  			keyFrameIndex = 0;
  			keyFramesLength = keyFrames.length;
  
  			for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
  				kf = keyFrames[keyFrameIndex];
  
  				if(kf.isEnd) {
  					kf.frame = _maxKeyFrame - kf.offset;
  				}
  			}
  
  			skrollable.keyFrames.sort(_keyFrameComparator);
  		}
  	};
  
  	/**
  	 * Calculates and sets the style properties for the element at the given frame.
  	 * @param fakeFrame The frame to render at when smooth scrolling is enabled.
  	 * @param actualFrame The actual frame we are at.
  	 */
  	var _calcSteps = function(fakeFrame, actualFrame) {
  		//Iterate over all skrollables.
  		var skrollableIndex = 0;
  		var skrollablesLength = _skrollables.length;
  
  		for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
  			var skrollable = _skrollables[skrollableIndex];
  			var element = skrollable.element;
  			var frame = skrollable.smoothScrolling ? fakeFrame : actualFrame;
  			var frames = skrollable.keyFrames;
  			var firstFrame = frames[0].frame;
  			var lastFrame = frames[frames.length - 1].frame;
  			var beforeFirst = frame < firstFrame;
  			var afterLast = frame > lastFrame;
  			var firstOrLastFrame = frames[beforeFirst ? 0 : frames.length - 1];
  			var key;
  			var value;
  
  			//If we are before/after the first/last frame, set the styles according to the given edge strategy.
  			if(beforeFirst || afterLast) {
  				//Check if we already handled this edge case last time.
  				//Note: using setScrollTop it's possible that we jumped from one edge to the other.
  				if(beforeFirst && skrollable.edge === -1 || afterLast && skrollable.edge === 1) {
  					continue;
  				}
  
  				//Add the skrollr-before or -after class.
  				_updateClass(element, [beforeFirst ? SKROLLABLE_BEFORE_CLASS : SKROLLABLE_AFTER_CLASS], [SKROLLABLE_BEFORE_CLASS, SKROLLABLE_BETWEEN_CLASS, SKROLLABLE_AFTER_CLASS]);
  
  				//Remember that we handled the edge case (before/after the first/last keyframe).
  				skrollable.edge = beforeFirst ? -1 : 1;
  
  				switch(skrollable.edgeStrategy) {
  					case 'reset':
  						_reset(element);
  						continue;
  					case 'ease':
  						//Handle this case like it would be exactly at first/last keyframe and just pass it on.
  						frame = firstOrLastFrame.frame;
  						break;
  					default:
  					case 'set':
  						var props = firstOrLastFrame.props;
  
  						for(key in props) {
  							if(hasProp.call(props, key)) {
  								value = _interpolateString(props[key].value);
  
  								skrollr.setStyle(element, key, value);
  							}
  						}
  
  						continue;
  				}
  			} else {
  				//Did we handle an edge last time?
  				if(skrollable.edge !== 0) {
  					_updateClass(element, [SKROLLABLE_CLASS, SKROLLABLE_BETWEEN_CLASS], [SKROLLABLE_BEFORE_CLASS, SKROLLABLE_AFTER_CLASS]);
  					skrollable.edge = 0;
  				}
  			}
  
  			//Find out between which two key frames we are right now.
  			var keyFrameIndex = 0;
  			var framesLength = frames.length - 1;
  
  			for(; keyFrameIndex < framesLength; keyFrameIndex++) {
  				if(frame >= frames[keyFrameIndex].frame && frame <= frames[keyFrameIndex + 1].frame) {
  					var left = frames[keyFrameIndex];
  					var right = frames[keyFrameIndex + 1];
  
  					for(key in left.props) {
  						if(hasProp.call(left.props, key)) {
  							var progress = (frame - left.frame) / (right.frame - left.frame);
  
  							//Transform the current progress using the given easing function.
  							progress = left.props[key].easing(progress);
  
  							//Interpolate between the two values
  							value = _calcInterpolation(left.props[key].value, right.props[key].value, progress);
  
  							value = _interpolateString(value);
  
  							skrollr.setStyle(element, key, value);
  						}
  					}
  
  					break;
  				}
  			}
  		}
  	};
  
  	/**
  	 * Renders all elements.
  	 */
  	var _render = function() {
  		if(_requestReflow) {
  			_requestReflow = false;
  			_reflow();
  		}
  
  		//We may render something else than the actual scrollbar position.
  		var renderTop = _instance.getScrollTop();
  
  		//If there's an animation, which ends in current render call, call the callback after rendering.
  		var afterAnimationCallback;
  		var now = _now();
  		var progress;
  
  		//Before actually rendering handle the scroll animation, if any.
  		if(_scrollAnimation) {
  			//It's over
  			if(now >= _scrollAnimation.endTime) {
  				renderTop = _scrollAnimation.targetTop;
  				afterAnimationCallback = _scrollAnimation.done;
  				_scrollAnimation = undefined;
  			} else {
  				//Map the current progress to the new progress using given easing function.
  				progress = _scrollAnimation.easing((now - _scrollAnimation.startTime) / _scrollAnimation.duration);
  
  				renderTop = (_scrollAnimation.startTop + progress * _scrollAnimation.topDiff) | 0;
  			}
  
  			_instance.setScrollTop(renderTop, true);
  		}
  		//Smooth scrolling only if there's no animation running and if we're not forcing the rendering.
  		else if(!_forceRender) {
  			var smoothScrollingDiff = _smoothScrolling.targetTop - renderTop;
  
  			//The user scrolled, start new smooth scrolling.
  			if(smoothScrollingDiff) {
  				_smoothScrolling = {
  					startTop: _lastTop,
  					topDiff: renderTop - _lastTop,
  					targetTop: renderTop,
  					startTime: _lastRenderCall,
  					endTime: _lastRenderCall + _smoothScrollingDuration
  				};
  			}
  
  			//Interpolate the internal scroll position (not the actual scrollbar).
  			if(now <= _smoothScrolling.endTime) {
  				//Map the current progress to the new progress using easing function.
  				progress = easings.sqrt((now - _smoothScrolling.startTime) / _smoothScrollingDuration);
  
  				renderTop = (_smoothScrolling.startTop + progress * _smoothScrolling.topDiff) | 0;
  			}
  		}
  
  		//That's were we actually "scroll" on mobile.
  		if(_isMobile && _skrollrBody) {
  			//Set the transform ("scroll it").
  			skrollr.setStyle(_skrollrBody, 'transform', 'translate(0, ' + -(_mobileOffset) + 'px) ' + _translateZ);
  		}
  
  		//Did the scroll position even change?
  		if(_forceRender || _lastTop !== renderTop) {
  			//Remember in which direction are we scrolling?
  			_direction = (renderTop > _lastTop) ? 'down' : (renderTop < _lastTop ? 'up' : _direction);
  
  			_forceRender = false;
  
  			var listenerParams = {
  				curTop: renderTop,
  				lastTop: _lastTop,
  				maxTop: _maxKeyFrame,
  				direction: _direction
  			};
  
  			//Tell the listener we are about to render.
  			var continueRendering = _listeners.beforerender && _listeners.beforerender.call(_instance, listenerParams);
  
  			//The beforerender listener function is able the cancel rendering.
  			if(continueRendering !== false) {
  				//Now actually interpolate all the styles.
  				_calcSteps(renderTop, _instance.getScrollTop());
  
  				//Remember when we last rendered.
  				_lastTop = renderTop;
  
  				if(_listeners.render) {
  					_listeners.render.call(_instance, listenerParams);
  				}
  			}
  
  			if(afterAnimationCallback) {
  				afterAnimationCallback.call(_instance, false);
  			}
  		}
  
  		_lastRenderCall = now;
  	};
  
  	/**
  	 * Parses the properties for each key frame of the given skrollable.
  	 */
  	var _parseProps = function(skrollable) {
  		//Iterate over all key frames
  		var keyFrameIndex = 0;
  		var keyFramesLength = skrollable.keyFrames.length;
  
  		for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
  			var frame = skrollable.keyFrames[keyFrameIndex];
  			var easing;
  			var value;
  			var prop;
  			var props = {};
  
  			var match;
  
  			while((match = rxPropValue.exec(frame.props)) !== null) {
  				prop = match[1];
  				value = match[2];
  
  				easing = prop.match(rxPropEasing);
  
  				//Is there an easing specified for this prop?
  				if(easing !== null) {
  					prop = easing[1];
  					easing = easing[2];
  				} else {
  					easing = DEFAULT_EASING;
  				}
  
  				//Exclamation point at first position forces the value to be taken literal.
  				value = value.indexOf('!') ? _parseProp(value) : [value.slice(1)];
  
  				//Save the prop for this key frame with his value and easing function
  				props[prop] = {
  					value: value,
  					easing: easings[easing]
  				};
  			}
  
  			frame.props = props;
  		}
  	};
  
  	/**
  	 * Parses a value extracting numeric values and generating a format string
  	 * for later interpolation of the new values in old string.
  	 *
  	 * @param val The CSS value to be parsed.
  	 * @return Something like ["rgba(?%,?%, ?%,?)", 100, 50, 0, .7]
  	 * where the first element is the format string later used
  	 * and all following elements are the numeric value.
  	 */
  	var _parseProp = function(val) {
  		var numbers = [];
  
  		//One special case, where floats don't work.
  		//We replace all occurences of rgba colors
  		//which don't use percentage notation with the percentage notation.
  		rxRGBAIntegerColor.lastIndex = 0;
  		val = val.replace(rxRGBAIntegerColor, function(rgba) {
  			return rgba.replace(rxNumericValue, function(n) {
  				return n / 255 * 100 + '%';
  			});
  		});
  
  		//Handle prefixing of "gradient" values.
  		//For now only the prefixed value will be set. Unprefixed isn't supported anyway.
  		if(theDashedCSSPrefix) {
  			rxGradient.lastIndex = 0;
  			val = val.replace(rxGradient, function(s) {
  				return theDashedCSSPrefix + s;
  			});
  		}
  
  		//Now parse ANY number inside this string and create a format string.
  		val = val.replace(rxNumericValue, function(n) {
  			numbers.push(+n);
  			return '{?}';
  		});
  
  		//Add the formatstring as first value.
  		numbers.unshift(val);
  
  		return numbers;
  	};
  
  	/**
  	 * Fills the key frames with missing left and right hand properties.
  	 * If key frame 1 has property X and key frame 2 is missing X,
  	 * but key frame 3 has X again, then we need to assign X to key frame 2 too.
  	 *
  	 * @param sk A skrollable.
  	 */
  	var _fillProps = function(sk) {
  		//Will collect the properties key frame by key frame
  		var propList = {};
  		var keyFrameIndex;
  		var keyFramesLength;
  
  		//Iterate over all key frames from left to right
  		keyFrameIndex = 0;
  		keyFramesLength = sk.keyFrames.length;
  
  		for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
  			_fillPropForFrame(sk.keyFrames[keyFrameIndex], propList);
  		}
  
  		//Now do the same from right to fill the last gaps
  
  		propList = {};
  
  		//Iterate over all key frames from right to left
  		keyFrameIndex = sk.keyFrames.length - 1;
  
  		for(; keyFrameIndex >= 0; keyFrameIndex--) {
  			_fillPropForFrame(sk.keyFrames[keyFrameIndex], propList);
  		}
  	};
  
  	var _fillPropForFrame = function(frame, propList) {
  		var key;
  
  		//For each key frame iterate over all right hand properties and assign them,
  		//but only if the current key frame doesn't have the property by itself
  		for(key in propList) {
  			//The current frame misses this property, so assign it.
  			if(!hasProp.call(frame.props, key)) {
  				frame.props[key] = propList[key];
  			}
  		}
  
  		//Iterate over all props of the current frame and collect them
  		for(key in frame.props) {
  			propList[key] = frame.props[key];
  		}
  	};
  
  	/**
  	 * Calculates the new values for two given values array.
  	 */
  	var _calcInterpolation = function(val1, val2, progress) {
  		var valueIndex;
  		var val1Length = val1.length;
  
  		//They both need to have the same length
  		if(val1Length !== val2.length) {
  			throw 'Can\'t interpolate between "' + val1[0] + '" and "' + val2[0] + '"';
  		}
  
  		//Add the format string as first element.
  		var interpolated = [val1[0]];
  
  		valueIndex = 1;
  
  		for(; valueIndex < val1Length; valueIndex++) {
  			//That's the line where the two numbers are actually interpolated.
  			interpolated[valueIndex] = val1[valueIndex] + ((val2[valueIndex] - val1[valueIndex]) * progress);
  		}
  
  		return interpolated;
  	};
  
  	/**
  	 * Interpolates the numeric values into the format string.
  	 */
  	var _interpolateString = function(val) {
  		var valueIndex = 1;
  
  		rxInterpolateString.lastIndex = 0;
  
  		return val[0].replace(rxInterpolateString, function() {
  			return val[valueIndex++];
  		});
  	};
  
  	/**
  	 * Resets the class and style attribute to what it was before skrollr manipulated the element.
  	 * Also remembers the values it had before reseting, in order to undo the reset.
  	 */
  	var _reset = function(elements, undo) {
  		//We accept a single element or an array of elements.
  		elements = [].concat(elements);
  
  		var skrollable;
  		var element;
  		var elementsIndex = 0;
  		var elementsLength = elements.length;
  
  		for(; elementsIndex < elementsLength; elementsIndex++) {
  			element = elements[elementsIndex];
  			skrollable = _skrollables[element[SKROLLABLE_ID_DOM_PROPERTY]];
  
  			//Couldn't find the skrollable for this DOM element.
  			if(!skrollable) {
  				continue;
  			}
  
  			if(undo) {
  				//Reset class and style to the "dirty" (set by skrollr) values.
  				element.style.cssText = skrollable.dirtyStyleAttr;
  				_updateClass(element, skrollable.dirtyClassAttr);
  			} else {
  				//Remember the "dirty" (set by skrollr) class and style.
  				skrollable.dirtyStyleAttr = element.style.cssText;
  				skrollable.dirtyClassAttr = _getClass(element);
  
  				//Reset class and style to what it originally was.
  				element.style.cssText = skrollable.styleAttr;
  				_updateClass(element, skrollable.classAttr);
  			}
  		}
  	};
  
  	/**
  	 * Detects support for 3d transforms by applying it to the skrollr-body.
  	 */
  	var _detect3DTransforms = function() {
  		_translateZ = 'translateZ(0)';
  		skrollr.setStyle(_skrollrBody, 'transform', _translateZ);
  
  		var computedStyle = getStyle(_skrollrBody);
  		var computedTransform = computedStyle.getPropertyValue('transform');
  		var computedTransformWithPrefix = computedStyle.getPropertyValue(theDashedCSSPrefix + 'transform');
  		var has3D = (computedTransform && computedTransform !== 'none') || (computedTransformWithPrefix && computedTransformWithPrefix !== 'none');
  
  		if(!has3D) {
  			_translateZ = '';
  		}
  	};
  
  	/**
  	 * Set the CSS property on the given element. Sets prefixed properties as well.
  	 */
  	skrollr.setStyle = function(el, prop, val) {
  		var style = el.style;
  
  		//Camel case.
  		prop = prop.replace(rxCamelCase, rxCamelCaseFn).replace('-', '');
  
  		//Make sure z-index gets a <integer>.
  		//This is the only <integer> case we need to handle.
  		if(prop === 'zIndex') {
  			if(isNaN(val)) {
  				//If it's not a number, don't touch it.
  				//It could for example be "auto" (#351).
  				style[prop] = val;
  			} else {
  				//Floor the number.
  				style[prop] = '' + (val | 0);
  			}
  		}
  		//#64: "float" can't be set across browsers. Needs to use "cssFloat" for all except IE.
  		else if(prop === 'float') {
  			style.styleFloat = style.cssFloat = val;
  		}
  		else {
  			//Need try-catch for old IE.
  			try {
  				//Set prefixed property if there's a prefix.
  				if(theCSSPrefix) {
  					style[theCSSPrefix + prop.slice(0,1).toUpperCase() + prop.slice(1)] = val;
  				}
  
  				//Set unprefixed.
  				style[prop] = val;
  			} catch(ignore) {}
  		}
  	};
  
  	/**
  	 * Cross browser event handling.
  	 */
  	var _addEvent = skrollr.addEvent = function(element, names, callback) {
  		var intermediate = function(e) {
  			//Normalize IE event stuff.
  			e = e || window.event;
  
  			if(!e.target) {
  				e.target = e.srcElement;
  			}
  
  			if(!e.preventDefault) {
  				e.preventDefault = function() {
  					e.returnValue = false;
  				};
  			}
  
  			return callback.call(this, e);
  		};
  
  		names = names.split(' ');
  
  		var name;
  		var nameCounter = 0;
  		var namesLength = names.length;
  
  		for(; nameCounter < namesLength; nameCounter++) {
  			name = names[nameCounter];
  
  			if(element.addEventListener) {
  				element.addEventListener(name, callback, false);
  			} else {
  				element.attachEvent('on' + name, intermediate);
  			}
  
  			//Remember the events to be able to flush them later.
  			_registeredEvents.push({
  				element: element,
  				name: name,
  				listener: callback
  			});
  		}
  	};
  
  	var _removeEvent = skrollr.removeEvent = function(element, names, callback) {
  		names = names.split(' ');
  
  		var nameCounter = 0;
  		var namesLength = names.length;
  
  		for(; nameCounter < namesLength; nameCounter++) {
  			if(element.removeEventListener) {
  				element.removeEventListener(names[nameCounter], callback, false);
  			} else {
  				element.detachEvent('on' + names[nameCounter], callback);
  			}
  		}
  	};
  
  	var _removeAllEvents = function() {
  		var eventData;
  		var eventCounter = 0;
  		var eventsLength = _registeredEvents.length;
  
  		for(; eventCounter < eventsLength; eventCounter++) {
  			eventData = _registeredEvents[eventCounter];
  
  			_removeEvent(eventData.element, eventData.name, eventData.listener);
  		}
  
  		_registeredEvents = [];
  	};
  
  	var _reflow = function() {
  		var pos = _instance.getScrollTop();
  
  		//Will be recalculated by _updateDependentKeyFrames.
  		_maxKeyFrame = 0;
  
  		if(_forceHeight && !_isMobile) {
  			//un-"force" the height to not mess with the calculations in _updateDependentKeyFrames (#216).
  			body.style.height = 'auto';
  		}
  
  		_updateDependentKeyFrames();
  
  		if(_forceHeight && !_isMobile) {
  			//"force" the height.
  			body.style.height = (_maxKeyFrame + documentElement.clientHeight) + 'px';
  		}
  
  		//The scroll offset may now be larger than needed (on desktop the browser/os prevents scrolling farther than the bottom).
  		if(_isMobile) {
  			_instance.setScrollTop(Math.min(_instance.getScrollTop(), _maxKeyFrame));
  		} else {
  			//Remember and reset the scroll pos (#217).
  			_instance.setScrollTop(pos, true);
  		}
  
  		_forceRender = true;
  	};
  
  	/*
  	 * Returns the height of the document.
  	 */
  	var _getDocumentHeight = function() {
  		var skrollrBodyHeight = (_skrollrBody && _skrollrBody.offsetHeight || 0);
  		var bodyHeight = Math.max(skrollrBodyHeight, body.scrollHeight, body.offsetHeight, documentElement.scrollHeight, documentElement.offsetHeight, documentElement.clientHeight);
  
  		return bodyHeight - documentElement.clientHeight;
  	};
  
  	/**
  	 * Returns a string of space separated classnames for the current element.
  	 * Works with SVG as well.
  	 */
  	var _getClass = function(element) {
  		var prop = 'className';
  
  		//SVG support by using className.baseVal instead of just className.
  		if(window.SVGElement && element instanceof window.SVGElement) {
  			element = element[prop];
  			prop = 'baseVal';
  		}
  
  		return element[prop];
  	};
  
  	/**
  	 * Adds and removes a CSS classes.
  	 * Works with SVG as well.
  	 * add and remove are arrays of strings,
  	 * or if remove is ommited add is a string and overwrites all classes.
  	 */
  	var _updateClass = function(element, add, remove) {
  		var prop = 'className';
  
  		//SVG support by using className.baseVal instead of just className.
  		if(window.SVGElement && element instanceof window.SVGElement) {
  			element = element[prop];
  			prop = 'baseVal';
  		}
  
  		//When remove is ommited, we want to overwrite/set the classes.
  		if(remove === undefined) {
  			element[prop] = add;
  			return;
  		}
  
  		//Cache current classes. We will work on a string before passing back to DOM.
  		var val = element[prop];
  
  		//All classes to be removed.
  		var classRemoveIndex = 0;
  		var removeLength = remove.length;
  
  		for(; classRemoveIndex < removeLength; classRemoveIndex++) {
  			val = _untrim(val).replace(_untrim(remove[classRemoveIndex]), ' ');
  		}
  
  		val = _trim(val);
  
  		//All classes to be added.
  		var classAddIndex = 0;
  		var addLength = add.length;
  
  		for(; classAddIndex < addLength; classAddIndex++) {
  			//Only add if el not already has class.
  			if(_untrim(val).indexOf(_untrim(add[classAddIndex])) === -1) {
  				val += ' ' + add[classAddIndex];
  			}
  		}
  
  		element[prop] = _trim(val);
  	};
  
  	var _trim = function(a) {
  		return a.replace(rxTrim, '');
  	};
  
  	/**
  	 * Adds a space before and after the string.
  	 */
  	var _untrim = function(a) {
  		return ' ' + a + ' ';
  	};
  
  	var _now = Date.now || function() {
  		return +new Date();
  	};
  
  	var _keyFrameComparator = function(a, b) {
  		return a.frame - b.frame;
  	};
  
  	/*
  	 * Private variables.
  	 */
  
  	//Singleton
  	var _instance;
  
  	/*
  		A list of all elements which should be animated associated with their the metadata.
  		Exmaple skrollable with two key frames animating from 100px width to 20px:
  
  		skrollable = {
  			element: <the DOM element>,
  			styleAttr: <style attribute of the element before skrollr>,
  			classAttr: <class attribute of the element before skrollr>,
  			keyFrames: [
  				{
  					frame: 100,
  					props: {
  						width: {
  							value: ['{?}px', 100],
  							easing: <reference to easing function>
  						}
  					},
  					mode: "absolute"
  				},
  				{
  					frame: 200,
  					props: {
  						width: {
  							value: ['{?}px', 20],
  							easing: <reference to easing function>
  						}
  					},
  					mode: "absolute"
  				}
  			]
  		};
  	*/
  	var _skrollables;
  
  	var _skrollrBody;
  
  	var _listeners;
  	var _forceHeight;
  	var _maxKeyFrame = 0;
  
  	var _scale = 1;
  	var _constants;
  
  	var _mobileDeceleration;
  
  	//Current direction (up/down).
  	var _direction = 'down';
  
  	//The last top offset value. Needed to determine direction.
  	var _lastTop = -1;
  
  	//The last time we called the render method (doesn't mean we rendered!).
  	var _lastRenderCall = _now();
  
  	//For detecting if it actually resized (#271).
  	var _lastViewportWidth = 0;
  	var _lastViewportHeight = 0;
  
  	var _requestReflow = false;
  
  	//Will contain data about a running scrollbar animation, if any.
  	var _scrollAnimation;
  
  	var _smoothScrollingEnabled;
  
  	var _smoothScrollingDuration;
  
  	//Will contain settins for smooth scrolling if enabled.
  	var _smoothScrolling;
  
  	//Can be set by any operation/event to force rendering even if the scrollbar didn't move.
  	var _forceRender;
  
  	//Each skrollable gets an unique ID incremented for each skrollable.
  	//The ID is the index in the _skrollables array.
  	var _skrollableIdCounter = 0;
  
  	var _edgeStrategy;
  
  
  	//Mobile specific vars. Will be stripped by UglifyJS when not in use.
  	var _isMobile = false;
  
  	//The virtual scroll offset when using mobile scrolling.
  	var _mobileOffset = 0;
  
  	//If the browser supports 3d transforms, this will be filled with 'translateZ(0)' (empty string otherwise).
  	var _translateZ;
  
  	//Will contain data about registered events by skrollr.
  	var _registeredEvents = [];
  
  	//Animation frame id returned by RequestAnimationFrame (or timeout when RAF is not supported).
  	var _animFrame;
  }(window, document));