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plugins/smooth-scroll/16.1.0/smooth-scroll.js

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+/*!
+ * smooth-scroll v16.1.0
+ * Animate scrolling to anchor links
+ * (c) 2019 Chris Ferdinandi
+ * MIT License
+ * http://github.com/cferdinandi/smooth-scroll
+ */
+
+(function (root, factory) {
+	if (typeof define === 'function' && define.amd) {
+		define([], (function () {
+			return factory(root);
+		}));
+	} else if (typeof exports === 'object') {
+		module.exports = factory(root);
+	} else {
+		root.SmoothScroll = factory(root);
+	}
+})(typeof global !== 'undefined' ? global : typeof window !== 'undefined' ? window : this, (function (window) {
+
+	'use strict';
+
+	//
+	// Default settings
+	//
+
+	var defaults = {
+
+		// Selectors
+		ignore: '[data-scroll-ignore]',
+		header: null,
+		topOnEmptyHash: true,
+
+		// Speed & Duration
+		speed: 500,
+		speedAsDuration: false,
+		durationMax: null,
+		durationMin: null,
+		clip: true,
+		offset: 0,
+
+		// Easing
+		easing: 'easeInOutCubic',
+		customEasing: null,
+
+		// History
+		updateURL: true,
+		popstate: true,
+
+		// Custom Events
+		emitEvents: true
+
+	};
+
+
+	//
+	// Utility Methods
+	//
+
+	/**
+	 * Check if browser supports required methods
+	 * @return {Boolean} Returns true if all required methods are supported
+	 */
+	var supports = function () {
+		return (
+			'querySelector' in document &&
+			'addEventListener' in window &&
+			'requestAnimationFrame' in window &&
+			'closest' in window.Element.prototype
+		);
+	};
+
+	/**
+	 * Merge two or more objects together.
+	 * @param   {Object}   objects  The objects to merge together
+	 * @returns {Object}            Merged values of defaults and options
+	 */
+	var extend = function () {
+		var merged = {};
+		Array.prototype.forEach.call(arguments, (function (obj) {
+			for (var key in obj) {
+				if (!obj.hasOwnProperty(key)) return;
+				merged[key] = obj[key];
+			}
+		}));
+		return merged;
+	};
+
+	/**
+	 * Check to see if user prefers reduced motion
+	 * @param  {Object} settings Script settings
+	 */
+	var reduceMotion = function () {
+		if ('matchMedia' in window && window.matchMedia('(prefers-reduced-motion)').matches) {
+			return true;
+		}
+		return false;
+	};
+
+	/**
+	 * Get the height of an element.
+	 * @param  {Node} elem The element to get the height of
+	 * @return {Number}    The element's height in pixels
+	 */
+	var getHeight = function (elem) {
+		return parseInt(window.getComputedStyle(elem).height, 10);
+	};
+
+	/**
+	 * Escape special characters for use with querySelector
+	 * @author Mathias Bynens
+	 * @link https://github.com/mathiasbynens/CSS.escape
+	 * @param {String} id The anchor ID to escape
+	 */
+	var escapeCharacters = function (id) {
+
+		// Remove leading hash
+		if (id.charAt(0) === '#') {
+			id = id.substr(1);
+		}
+
+		var string = String(id);
+		var length = string.length;
+		var index = -1;
+		var codeUnit;
+		var result = '';
+		var firstCodeUnit = string.charCodeAt(0);
+		while (++index < length) {
+			codeUnit = string.charCodeAt(index);
+			// Note: there’s no need to special-case astral symbols, surrogate
+			// pairs, or lone surrogates.
+
+			// If the character is NULL (U+0000), then throw an
+			// `InvalidCharacterError` exception and terminate these steps.
+			if (codeUnit === 0x0000) {
+				throw new InvalidCharacterError(
+					'Invalid character: the input contains U+0000.'
+				);
+			}
+
+			if (
+				// If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
+				// U+007F, […]
+				(codeUnit >= 0x0001 && codeUnit <= 0x001F) || codeUnit == 0x007F ||
+				// If the character is the first character and is in the range [0-9]
+				// (U+0030 to U+0039), […]
+				(index === 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
+				// If the character is the second character and is in the range [0-9]
+				// (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
+				(
+					index === 1 &&
+					codeUnit >= 0x0030 && codeUnit <= 0x0039 &&
+					firstCodeUnit === 0x002D
+				)
+			) {
+				// http://dev.w3.org/csswg/cssom/#escape-a-character-as-code-point
+				result += '\\' + codeUnit.toString(16) + ' ';
+				continue;
+			}
+
+			// If the character is not handled by one of the above rules and is
+			// greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
+			// is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
+			// U+005A), or [a-z] (U+0061 to U+007A), […]
+			if (
+				codeUnit >= 0x0080 ||
+				codeUnit === 0x002D ||
+				codeUnit === 0x005F ||
+				codeUnit >= 0x0030 && codeUnit <= 0x0039 ||
+				codeUnit >= 0x0041 && codeUnit <= 0x005A ||
+				codeUnit >= 0x0061 && codeUnit <= 0x007A
+			) {
+				// the character itself
+				result += string.charAt(index);
+				continue;
+			}
+
+			// Otherwise, the escaped character.
+			// http://dev.w3.org/csswg/cssom/#escape-a-character
+			result += '\\' + string.charAt(index);
+
+		}
+
+		// Return sanitized hash
+		return '#' + result;
+
+	};
+
+	/**
+	 * Calculate the easing pattern
+	 * @link https://gist.github.com/gre/1650294
+	 * @param {String} type Easing pattern
+	 * @param {Number} time Time animation should take to complete
+	 * @returns {Number}
+	 */
+	var easingPattern = function (settings, time) {
+		var pattern;
+
+		// Default Easing Patterns
+		if (settings.easing === 'easeInQuad') pattern = time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutQuad') pattern = time * (2 - time); // decelerating to zero velocity
+		if (settings.easing === 'easeInOutQuad') pattern = time < 0.5 ? 2 * time * time : -1 + (4 - 2 * time) * time; // acceleration until halfway, then deceleration
+		if (settings.easing === 'easeInCubic') pattern = time * time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutCubic') pattern = (--time) * time * time + 1; // decelerating to zero velocity
+		if (settings.easing === 'easeInOutCubic') pattern = time < 0.5 ? 4 * time * time * time : (time - 1) * (2 * time - 2) * (2 * time - 2) + 1; // acceleration until halfway, then deceleration
+		if (settings.easing === 'easeInQuart') pattern = time * time * time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutQuart') pattern = 1 - (--time) * time * time * time; // decelerating to zero velocity
+		if (settings.easing === 'easeInOutQuart') pattern = time < 0.5 ? 8 * time * time * time * time : 1 - 8 * (--time) * time * time * time; // acceleration until halfway, then deceleration
+		if (settings.easing === 'easeInQuint') pattern = time * time * time * time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutQuint') pattern = 1 + (--time) * time * time * time * time; // decelerating to zero velocity
+		if (settings.easing === 'easeInOutQuint') pattern = time < 0.5 ? 16 * time * time * time * time * time : 1 + 16 * (--time) * time * time * time * time; // acceleration until halfway, then deceleration
+
+		// Custom Easing Patterns
+		if (!!settings.customEasing) pattern = settings.customEasing(time);
+
+		return pattern || time; // no easing, no acceleration
+	};
+
+	/**
+	 * Determine the document's height
+	 * @returns {Number}
+	 */
+	var getDocumentHeight = function () {
+		return Math.max(
+			document.body.scrollHeight, document.documentElement.scrollHeight,
+			document.body.offsetHeight, document.documentElement.offsetHeight,
+			document.body.clientHeight, document.documentElement.clientHeight
+		);
+	};
+
+	/**
+	 * Calculate how far to scroll
+	 * Clip support added by robjtede - https://github.com/cferdinandi/smooth-scroll/issues/405
+	 * @param {Element} anchor       The anchor element to scroll to
+	 * @param {Number}  headerHeight Height of a fixed header, if any
+	 * @param {Number}  offset       Number of pixels by which to offset scroll
+	 * @param {Boolean} clip         If true, adjust scroll distance to prevent abrupt stops near the bottom of the page
+	 * @returns {Number}
+	 */
+	var getEndLocation = function (anchor, headerHeight, offset, clip) {
+		var location = 0;
+		if (anchor.offsetParent) {
+			do {
+				location += anchor.offsetTop;
+				anchor = anchor.offsetParent;
+			} while (anchor);
+		}
+		location = Math.max(location - headerHeight - offset, 0);
+		if (clip) {
+			location = Math.min(location, getDocumentHeight() - window.innerHeight);
+		}
+ 		return location;
+	};
+
+	/**
+	 * Get the height of the fixed header
+	 * @param  {Node}   header The header
+	 * @return {Number}        The height of the header
+	 */
+	var getHeaderHeight = function (header) {
+		return !header ? 0 : (getHeight(header) + header.offsetTop);
+	};
+
+	/**
+	 * Calculate the speed to use for the animation
+	 * @param  {Number} distance The distance to travel
+	 * @param  {Object} settings The plugin settings
+	 * @return {Number}          How fast to animate
+	 */
+	var getSpeed = function (distance, settings) {
+		var speed = settings.speedAsDuration ? settings.speed : Math.abs(distance / 1000 * settings.speed);
+		if (settings.durationMax && speed > settings.durationMax) return settings.durationMax;
+		if (settings.durationMin && speed < settings.durationMin) return settings.durationMin;
+		return parseInt(speed, 10);
+	};
+
+	var setHistory = function (options) {
+
+		// Make sure this should run
+		if (!history.replaceState || !options.updateURL || history.state) return;
+
+		// Get the hash to use
+		var hash = window.location.hash;
+		hash = hash ? hash : '';
+
+		// Set a default history
+		history.replaceState(
+			{
+				smoothScroll: JSON.stringify(options),
+				anchor: hash ? hash : window.pageYOffset
+			},
+			document.title,
+			hash ? hash : window.location.href
+		);
+
+	};
+
+	/**
+	 * Update the URL
+	 * @param  {Node}    anchor  The anchor that was scrolled to
+	 * @param  {Boolean} isNum   If true, anchor is a number
+	 * @param  {Object}  options Settings for Smooth Scroll
+	 */
+	var updateURL = function (anchor, isNum, options) {
+
+		// Bail if the anchor is a number
+		if (isNum) return;
+
+		// Verify that pushState is supported and the updateURL option is enabled
+		if (!history.pushState || !options.updateURL) return;
+
+		// Update URL
+		history.pushState(
+			{
+				smoothScroll: JSON.stringify(options),
+				anchor: anchor.id
+			},
+			document.title,
+			anchor === document.documentElement ? '#top' : '#' + anchor.id
+		);
+
+	};
+
+	/**
+	 * Bring the anchored element into focus
+	 * @param {Node}     anchor      The anchor element
+	 * @param {Number}   endLocation The end location to scroll to
+	 * @param {Boolean}  isNum       If true, scroll is to a position rather than an element
+	 */
+	var adjustFocus = function (anchor, endLocation, isNum) {
+
+		// Is scrolling to top of page, blur
+		if (anchor === 0) {
+			document.body.focus();
+		}
+
+		// Don't run if scrolling to a number on the page
+		if (isNum) return;
+
+		// Otherwise, bring anchor element into focus
+		anchor.focus();
+		if (document.activeElement !== anchor) {
+			anchor.setAttribute('tabindex', '-1');
+			anchor.focus();
+			anchor.style.outline = 'none';
+		}
+		window.scrollTo(0 , endLocation);
+
+	};
+
+	/**
+	 * Emit a custom event
+	 * @param  {String} type    The event type
+	 * @param  {Object} options The settings object
+	 * @param  {Node}   anchor  The anchor element
+	 * @param  {Node}   toggle  The toggle element
+	 */
+	var emitEvent = function (type, options, anchor, toggle) {
+		if (!options.emitEvents || typeof window.CustomEvent !== 'function') return;
+		var event = new CustomEvent(type, {
+			bubbles: true,
+			detail: {
+				anchor: anchor,
+				toggle: toggle
+			}
+		});
+		document.dispatchEvent(event);
+	};
+
+
+	//
+	// SmoothScroll Constructor
+	//
+
+	var SmoothScroll = function (selector, options) {
+
+		//
+		// Variables
+		//
+
+		var smoothScroll = {}; // Object for public APIs
+		var settings, anchor, toggle, fixedHeader, eventTimeout, animationInterval;
+
+
+		//
+		// Methods
+		//
+
+		/**
+		 * Cancel a scroll-in-progress
+		 */
+		smoothScroll.cancelScroll = function (noEvent) {
+			cancelAnimationFrame(animationInterval);
+			animationInterval = null;
+			if (noEvent) return;
+			emitEvent('scrollCancel', settings);
+		};
+
+		/**
+		 * Start/stop the scrolling animation
+		 * @param {Node|Number} anchor  The element or position to scroll to
+		 * @param {Element}     toggle  The element that toggled the scroll event
+		 * @param {Object}      options
+		 */
+		smoothScroll.animateScroll = function (anchor, toggle, options) {
+
+			// Cancel any in progress scrolls
+			smoothScroll.cancelScroll();
+
+			// Local settings
+			var _settings = extend(settings || defaults, options || {}); // Merge user options with defaults
+
+			// Selectors and variables
+			var isNum = Object.prototype.toString.call(anchor) === '[object Number]' ? true : false;
+			var anchorElem = isNum || !anchor.tagName ? null : anchor;
+			if (!isNum && !anchorElem) return;
+			var startLocation = window.pageYOffset; // Current location on the page
+			if (_settings.header && !fixedHeader) {
+				// Get the fixed header if not already set
+				fixedHeader = document.querySelector(_settings.header);
+			}
+			var headerHeight = getHeaderHeight(fixedHeader);
+			var endLocation = isNum ? anchor : getEndLocation(anchorElem, headerHeight, parseInt((typeof _settings.offset === 'function' ? _settings.offset(anchor, toggle) : _settings.offset), 10), _settings.clip); // Location to scroll to
+			var distance = endLocation - startLocation; // distance to travel
+			var documentHeight = getDocumentHeight();
+			var timeLapsed = 0;
+			var speed = getSpeed(distance, _settings);
+			var start, percentage, position;
+
+			/**
+			 * Stop the scroll animation when it reaches its target (or the bottom/top of page)
+			 * @param {Number} position Current position on the page
+			 * @param {Number} endLocation Scroll to location
+			 * @param {Number} animationInterval How much to scroll on this loop
+			 */
+			var stopAnimateScroll = function (position, endLocation) {
+
+				// Get the current location
+				var currentLocation = window.pageYOffset;
+
+				// Check if the end location has been reached yet (or we've hit the end of the document)
+				if (position == endLocation || currentLocation == endLocation || ((startLocation < endLocation && window.innerHeight + currentLocation) >= documentHeight)) {
+
+					// Clear the animation timer
+					smoothScroll.cancelScroll(true);
+
+					// Bring the anchored element into focus
+					adjustFocus(anchor, endLocation, isNum);
+
+					// Emit a custom event
+					emitEvent('scrollStop', _settings, anchor, toggle);
+
+					// Reset start
+					start = null;
+					animationInterval = null;
+
+					return true;
+
+				}
+			};
+
+			/**
+			 * Loop scrolling animation
+			 */
+			var loopAnimateScroll = function (timestamp) {
+				if (!start) { start = timestamp; }
+				timeLapsed += timestamp - start;
+				percentage = speed === 0 ? 0 : (timeLapsed / speed);
+				percentage = (percentage > 1) ? 1 : percentage;
+				position = startLocation + (distance * easingPattern(_settings, percentage));
+				window.scrollTo(0, Math.floor(position));
+				if (!stopAnimateScroll(position, endLocation)) {
+					animationInterval = window.requestAnimationFrame(loopAnimateScroll);
+					start = timestamp;
+				}
+			};
+
+			/**
+			 * Reset position to fix weird iOS bug
+			 * @link https://github.com/cferdinandi/smooth-scroll/issues/45
+			 */
+			if (window.pageYOffset === 0) {
+				window.scrollTo(0, 0);
+			}
+
+			// Update the URL
+			updateURL(anchor, isNum, _settings);
+
+			// If the user prefers reduced motion, jump to location
+			if (reduceMotion()) {
+				window.scrollTo(0, Math.floor(endLocation));
+				return;
+			}
+
+			// Emit a custom event
+			emitEvent('scrollStart', _settings, anchor, toggle);
+
+			// Start scrolling animation
+			smoothScroll.cancelScroll(true);
+			window.requestAnimationFrame(loopAnimateScroll);
+
+		};
+
+		/**
+		 * If smooth scroll element clicked, animate scroll
+		 */
+		var clickHandler = function (event) {
+
+			// Don't run if event was canceled but still bubbled up
+			// By @mgreter - https://github.com/cferdinandi/smooth-scroll/pull/462/
+			if (event.defaultPrevented) return;
+
+			// Don't run if right-click or command/control + click or shift + click
+			if (event.button !== 0 || event.metaKey || event.ctrlKey || event.shiftKey) return;
+
+			// Check if event.target has closest() method
+			// By @totegi - https://github.com/cferdinandi/smooth-scroll/pull/401/
+			if (!('closest' in event.target)) return;
+
+			// Check if a smooth scroll link was clicked
+			toggle = event.target.closest(selector);
+			if (!toggle || toggle.tagName.toLowerCase() !== 'a' || event.target.closest(settings.ignore)) return;
+
+			// Only run if link is an anchor and points to the current page
+			if (toggle.hostname !== window.location.hostname || toggle.pathname !== window.location.pathname || !/#/.test(toggle.href)) return;
+
+			// Get an escaped version of the hash
+			var hash = escapeCharacters(toggle.hash);
+
+			// Get the anchored element
+			var anchor;
+			if (hash === '#') {
+				if (!settings.topOnEmptyHash) return;
+				anchor = document.documentElement;
+			} else {
+				anchor = document.querySelector(hash);
+			}
+			anchor = !anchor && hash === '#top' ? document.documentElement : anchor;
+
+			// If anchored element exists, scroll to it
+			if (!anchor) return;
+			event.preventDefault();
+			setHistory(settings);
+			smoothScroll.animateScroll(anchor, toggle);
+
+		};
+
+		/**
+		 * Animate scroll on popstate events
+		 */
+		var popstateHandler = function (event) {
+
+			// Stop if history.state doesn't exist (ex. if clicking on a broken anchor link).
+			// fixes `Cannot read property 'smoothScroll' of null` error getting thrown.
+			if (history.state === null) return;
+
+			// Only run if state is a popstate record for this instantiation
+			if (!history.state.smoothScroll || history.state.smoothScroll !== JSON.stringify(settings)) return;
+
+			// Only run if state includes an anchor
+
+			// if (!history.state.anchor && history.state.anchor !== 0) return;
+
+			// Get the anchor
+			var anchor = history.state.anchor;
+			if (typeof anchor === 'string' && anchor) {
+				anchor = document.querySelector(escapeCharacters(history.state.anchor));
+				if (!anchor) return;
+			}
+
+			// Animate scroll to anchor link
+			smoothScroll.animateScroll(anchor, null, {updateURL: false});
+
+		};
+
+		/**
+		 * Destroy the current initialization.
+		 */
+		smoothScroll.destroy = function () {
+
+			// If plugin isn't already initialized, stop
+			if (!settings) return;
+
+			// Remove event listeners
+			document.removeEventListener('click', clickHandler, false);
+			window.removeEventListener('popstate', popstateHandler, false);
+
+			// Cancel any scrolls-in-progress
+			smoothScroll.cancelScroll();
+
+			// Reset variables
+			settings = null;
+			anchor = null;
+			toggle = null;
+			fixedHeader = null;
+			eventTimeout = null;
+			animationInterval = null;
+
+		};
+
+		/**
+		 * Initialize Smooth Scroll
+		 * @param {Object} options User settings
+		 */
+		var init = function () {
+
+			// feature test
+			if (!supports()) throw 'Smooth Scroll: This browser does not support the required JavaScript methods and browser APIs.';
+
+			// Destroy any existing initializations
+			smoothScroll.destroy();
+
+			// Selectors and variables
+			settings = extend(defaults, options || {}); // Merge user options with defaults
+			fixedHeader = settings.header ? document.querySelector(settings.header) : null; // Get the fixed header
+
+			// When a toggle is clicked, run the click handler
+			document.addEventListener('click', clickHandler, false);
+
+			// If updateURL and popState are enabled, listen for pop events
+			if (settings.updateURL && settings.popstate) {
+				window.addEventListener('popstate', popstateHandler, false);
+			}
+
+		};
+
+
+		//
+		// Initialize plugin
+		//
+
+		init();
+
+
+		//
+		// Public APIs
+		//
+
+		return smoothScroll;
+
+	};
+
+	return SmoothScroll;
+
+}));

plugins/smooth-scroll/16.1.0/smooth-scroll.polyfills.js

@@ -0,0 +1,715 @@
+/*!
+ * smooth-scroll v16.1.0
+ * Animate scrolling to anchor links
+ * (c) 2019 Chris Ferdinandi
+ * MIT License
+ * http://github.com/cferdinandi/smooth-scroll
+ */
+
+/**
+ * closest() polyfill
+ * @link https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill
+ */
+if (window.Element && !Element.prototype.closest) {
+	Element.prototype.closest = function(s) {
+		var matches = (this.document || this.ownerDocument).querySelectorAll(s),
+			i,
+			el = this;
+		do {
+			i = matches.length;
+			while (--i >= 0 && matches.item(i) !== el) {}
+		} while ((i < 0) && (el = el.parentElement));
+		return el;
+	};
+}
+
+/**
+ * CustomEvent() polyfill
+ * https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent#Polyfill
+ */
+(function () {
+
+	if (typeof window.CustomEvent === "function") return false;
+
+	function CustomEvent(event, params) {
+		params = params || { bubbles: false, cancelable: false, detail: undefined };
+		var evt = document.createEvent('CustomEvent');
+		evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
+		return evt;
+	}
+
+	CustomEvent.prototype = window.Event.prototype;
+
+	window.CustomEvent = CustomEvent;
+})();
+/**
+ * requestAnimationFrame() polyfill
+ * By Erik Möller. Fixes from Paul Irish and Tino Zijdel.
+ * @link http://paulirish.com/2011/requestanimationframe-for-smart-animating/
+ * @link http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
+ * @license MIT
+ */
+(function() {
+	var lastTime = 0;
+	var vendors = ['ms', 'moz', 'webkit', 'o'];
+	for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
+		window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
+		window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] ||
+		                              window[vendors[x]+'CancelRequestAnimationFrame'];
+	}
+
+	if (!window.requestAnimationFrame) {
+		window.requestAnimationFrame = function(callback, element) {
+			var currTime = new Date().getTime();
+			var timeToCall = Math.max(0, 16 - (currTime - lastTime));
+			var id = window.setTimeout((function() { callback(currTime + timeToCall); }),
+				timeToCall);
+			lastTime = currTime + timeToCall;
+			return id;
+		};
+	}
+
+	if (!window.cancelAnimationFrame) {
+		window.cancelAnimationFrame = function(id) {
+			clearTimeout(id);
+		};
+	}
+}());
+
+(function (root, factory) {
+	if (typeof define === 'function' && define.amd) {
+		define([], (function () {
+			return factory(root);
+		}));
+	} else if (typeof exports === 'object') {
+		module.exports = factory(root);
+	} else {
+		root.SmoothScroll = factory(root);
+	}
+})(typeof global !== 'undefined' ? global : typeof window !== 'undefined' ? window : this, (function (window) {
+
+	'use strict';
+
+	//
+	// Default settings
+	//
+
+	var defaults = {
+
+		// Selectors
+		ignore: '[data-scroll-ignore]',
+		header: null,
+		topOnEmptyHash: true,
+
+		// Speed & Duration
+		speed: 500,
+		speedAsDuration: false,
+		durationMax: null,
+		durationMin: null,
+		clip: true,
+		offset: 0,
+
+		// Easing
+		easing: 'easeInOutCubic',
+		customEasing: null,
+
+		// History
+		updateURL: true,
+		popstate: true,
+
+		// Custom Events
+		emitEvents: true
+
+	};
+
+
+	//
+	// Utility Methods
+	//
+
+	/**
+	 * Check if browser supports required methods
+	 * @return {Boolean} Returns true if all required methods are supported
+	 */
+	var supports = function () {
+		return (
+			'querySelector' in document &&
+			'addEventListener' in window &&
+			'requestAnimationFrame' in window &&
+			'closest' in window.Element.prototype
+		);
+	};
+
+	/**
+	 * Merge two or more objects together.
+	 * @param   {Object}   objects  The objects to merge together
+	 * @returns {Object}            Merged values of defaults and options
+	 */
+	var extend = function () {
+		var merged = {};
+		Array.prototype.forEach.call(arguments, (function (obj) {
+			for (var key in obj) {
+				if (!obj.hasOwnProperty(key)) return;
+				merged[key] = obj[key];
+			}
+		}));
+		return merged;
+	};
+
+	/**
+	 * Check to see if user prefers reduced motion
+	 * @param  {Object} settings Script settings
+	 */
+	var reduceMotion = function () {
+		if ('matchMedia' in window && window.matchMedia('(prefers-reduced-motion)').matches) {
+			return true;
+		}
+		return false;
+	};
+
+	/**
+	 * Get the height of an element.
+	 * @param  {Node} elem The element to get the height of
+	 * @return {Number}    The element's height in pixels
+	 */
+	var getHeight = function (elem) {
+		return parseInt(window.getComputedStyle(elem).height, 10);
+	};
+
+	/**
+	 * Escape special characters for use with querySelector
+	 * @author Mathias Bynens
+	 * @link https://github.com/mathiasbynens/CSS.escape
+	 * @param {String} id The anchor ID to escape
+	 */
+	var escapeCharacters = function (id) {
+
+		// Remove leading hash
+		if (id.charAt(0) === '#') {
+			id = id.substr(1);
+		}
+
+		var string = String(id);
+		var length = string.length;
+		var index = -1;
+		var codeUnit;
+		var result = '';
+		var firstCodeUnit = string.charCodeAt(0);
+		while (++index < length) {
+			codeUnit = string.charCodeAt(index);
+			// Note: there’s no need to special-case astral symbols, surrogate
+			// pairs, or lone surrogates.
+
+			// If the character is NULL (U+0000), then throw an
+			// `InvalidCharacterError` exception and terminate these steps.
+			if (codeUnit === 0x0000) {
+				throw new InvalidCharacterError(
+					'Invalid character: the input contains U+0000.'
+				);
+			}
+
+			if (
+				// If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
+				// U+007F, […]
+				(codeUnit >= 0x0001 && codeUnit <= 0x001F) || codeUnit == 0x007F ||
+				// If the character is the first character and is in the range [0-9]
+				// (U+0030 to U+0039), […]
+				(index === 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
+				// If the character is the second character and is in the range [0-9]
+				// (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
+				(
+					index === 1 &&
+					codeUnit >= 0x0030 && codeUnit <= 0x0039 &&
+					firstCodeUnit === 0x002D
+				)
+			) {
+				// http://dev.w3.org/csswg/cssom/#escape-a-character-as-code-point
+				result += '\\' + codeUnit.toString(16) + ' ';
+				continue;
+			}
+
+			// If the character is not handled by one of the above rules and is
+			// greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
+			// is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
+			// U+005A), or [a-z] (U+0061 to U+007A), […]
+			if (
+				codeUnit >= 0x0080 ||
+				codeUnit === 0x002D ||
+				codeUnit === 0x005F ||
+				codeUnit >= 0x0030 && codeUnit <= 0x0039 ||
+				codeUnit >= 0x0041 && codeUnit <= 0x005A ||
+				codeUnit >= 0x0061 && codeUnit <= 0x007A
+			) {
+				// the character itself
+				result += string.charAt(index);
+				continue;
+			}
+
+			// Otherwise, the escaped character.
+			// http://dev.w3.org/csswg/cssom/#escape-a-character
+			result += '\\' + string.charAt(index);
+
+		}
+
+		// Return sanitized hash
+		return '#' + result;
+
+	};
+
+	/**
+	 * Calculate the easing pattern
+	 * @link https://gist.github.com/gre/1650294
+	 * @param {String} type Easing pattern
+	 * @param {Number} time Time animation should take to complete
+	 * @returns {Number}
+	 */
+	var easingPattern = function (settings, time) {
+		var pattern;
+
+		// Default Easing Patterns
+		if (settings.easing === 'easeInQuad') pattern = time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutQuad') pattern = time * (2 - time); // decelerating to zero velocity
+		if (settings.easing === 'easeInOutQuad') pattern = time < 0.5 ? 2 * time * time : -1 + (4 - 2 * time) * time; // acceleration until halfway, then deceleration
+		if (settings.easing === 'easeInCubic') pattern = time * time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutCubic') pattern = (--time) * time * time + 1; // decelerating to zero velocity
+		if (settings.easing === 'easeInOutCubic') pattern = time < 0.5 ? 4 * time * time * time : (time - 1) * (2 * time - 2) * (2 * time - 2) + 1; // acceleration until halfway, then deceleration
+		if (settings.easing === 'easeInQuart') pattern = time * time * time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutQuart') pattern = 1 - (--time) * time * time * time; // decelerating to zero velocity
+		if (settings.easing === 'easeInOutQuart') pattern = time < 0.5 ? 8 * time * time * time * time : 1 - 8 * (--time) * time * time * time; // acceleration until halfway, then deceleration
+		if (settings.easing === 'easeInQuint') pattern = time * time * time * time * time; // accelerating from zero velocity
+		if (settings.easing === 'easeOutQuint') pattern = 1 + (--time) * time * time * time * time; // decelerating to zero velocity
+		if (settings.easing === 'easeInOutQuint') pattern = time < 0.5 ? 16 * time * time * time * time * time : 1 + 16 * (--time) * time * time * time * time; // acceleration until halfway, then deceleration
+
+		// Custom Easing Patterns
+		if (!!settings.customEasing) pattern = settings.customEasing(time);
+
+		return pattern || time; // no easing, no acceleration
+	};
+
+	/**
+	 * Determine the document's height
+	 * @returns {Number}
+	 */
+	var getDocumentHeight = function () {
+		return Math.max(
+			document.body.scrollHeight, document.documentElement.scrollHeight,
+			document.body.offsetHeight, document.documentElement.offsetHeight,
+			document.body.clientHeight, document.documentElement.clientHeight
+		);
+	};
+
+	/**
+	 * Calculate how far to scroll
+	 * Clip support added by robjtede - https://github.com/cferdinandi/smooth-scroll/issues/405
+	 * @param {Element} anchor       The anchor element to scroll to
+	 * @param {Number}  headerHeight Height of a fixed header, if any
+	 * @param {Number}  offset       Number of pixels by which to offset scroll
+	 * @param {Boolean} clip         If true, adjust scroll distance to prevent abrupt stops near the bottom of the page
+	 * @returns {Number}
+	 */
+	var getEndLocation = function (anchor, headerHeight, offset, clip) {
+		var location = 0;
+		if (anchor.offsetParent) {
+			do {
+				location += anchor.offsetTop;
+				anchor = anchor.offsetParent;
+			} while (anchor);
+		}
+		location = Math.max(location - headerHeight - offset, 0);
+		if (clip) {
+			location = Math.min(location, getDocumentHeight() - window.innerHeight);
+		}
+ 		return location;
+	};
+
+	/**
+	 * Get the height of the fixed header
+	 * @param  {Node}   header The header
+	 * @return {Number}        The height of the header
+	 */
+	var getHeaderHeight = function (header) {
+		return !header ? 0 : (getHeight(header) + header.offsetTop);
+	};
+
+	/**
+	 * Calculate the speed to use for the animation
+	 * @param  {Number} distance The distance to travel
+	 * @param  {Object} settings The plugin settings
+	 * @return {Number}          How fast to animate
+	 */
+	var getSpeed = function (distance, settings) {
+		var speed = settings.speedAsDuration ? settings.speed : Math.abs(distance / 1000 * settings.speed);
+		if (settings.durationMax && speed > settings.durationMax) return settings.durationMax;
+		if (settings.durationMin && speed < settings.durationMin) return settings.durationMin;
+		return parseInt(speed, 10);
+	};
+
+	var setHistory = function (options) {
+
+		// Make sure this should run
+		if (!history.replaceState || !options.updateURL || history.state) return;
+
+		// Get the hash to use
+		var hash = window.location.hash;
+		hash = hash ? hash : '';
+
+		// Set a default history
+		history.replaceState(
+			{
+				smoothScroll: JSON.stringify(options),
+				anchor: hash ? hash : window.pageYOffset
+			},
+			document.title,
+			hash ? hash : window.location.href
+		);
+
+	};
+
+	/**
+	 * Update the URL
+	 * @param  {Node}    anchor  The anchor that was scrolled to
+	 * @param  {Boolean} isNum   If true, anchor is a number
+	 * @param  {Object}  options Settings for Smooth Scroll
+	 */
+	var updateURL = function (anchor, isNum, options) {
+
+		// Bail if the anchor is a number
+		if (isNum) return;
+
+		// Verify that pushState is supported and the updateURL option is enabled
+		if (!history.pushState || !options.updateURL) return;
+
+		// Update URL
+		history.pushState(
+			{
+				smoothScroll: JSON.stringify(options),
+				anchor: anchor.id
+			},
+			document.title,
+			anchor === document.documentElement ? '#top' : '#' + anchor.id
+		);
+
+	};
+
+	/**
+	 * Bring the anchored element into focus
+	 * @param {Node}     anchor      The anchor element
+	 * @param {Number}   endLocation The end location to scroll to
+	 * @param {Boolean}  isNum       If true, scroll is to a position rather than an element
+	 */
+	var adjustFocus = function (anchor, endLocation, isNum) {
+
+		// Is scrolling to top of page, blur
+		if (anchor === 0) {
+			document.body.focus();
+		}
+
+		// Don't run if scrolling to a number on the page
+		if (isNum) return;
+
+		// Otherwise, bring anchor element into focus
+		anchor.focus();
+		if (document.activeElement !== anchor) {
+			anchor.setAttribute('tabindex', '-1');
+			anchor.focus();
+			anchor.style.outline = 'none';
+		}
+		window.scrollTo(0 , endLocation);
+
+	};
+
+	/**
+	 * Emit a custom event
+	 * @param  {String} type    The event type
+	 * @param  {Object} options The settings object
+	 * @param  {Node}   anchor  The anchor element
+	 * @param  {Node}   toggle  The toggle element
+	 */
+	var emitEvent = function (type, options, anchor, toggle) {
+		if (!options.emitEvents || typeof window.CustomEvent !== 'function') return;
+		var event = new CustomEvent(type, {
+			bubbles: true,
+			detail: {
+				anchor: anchor,
+				toggle: toggle
+			}
+		});
+		document.dispatchEvent(event);
+	};
+
+
+	//
+	// SmoothScroll Constructor
+	//
+
+	var SmoothScroll = function (selector, options) {
+
+		//
+		// Variables
+		//
+
+		var smoothScroll = {}; // Object for public APIs
+		var settings, anchor, toggle, fixedHeader, eventTimeout, animationInterval;
+
+
+		//
+		// Methods
+		//
+
+		/**
+		 * Cancel a scroll-in-progress
+		 */
+		smoothScroll.cancelScroll = function (noEvent) {
+			cancelAnimationFrame(animationInterval);
+			animationInterval = null;
+			if (noEvent) return;
+			emitEvent('scrollCancel', settings);
+		};
+
+		/**
+		 * Start/stop the scrolling animation
+		 * @param {Node|Number} anchor  The element or position to scroll to
+		 * @param {Element}     toggle  The element that toggled the scroll event
+		 * @param {Object}      options
+		 */
+		smoothScroll.animateScroll = function (anchor, toggle, options) {
+
+			// Cancel any in progress scrolls
+			smoothScroll.cancelScroll();
+
+			// Local settings
+			var _settings = extend(settings || defaults, options || {}); // Merge user options with defaults
+
+			// Selectors and variables
+			var isNum = Object.prototype.toString.call(anchor) === '[object Number]' ? true : false;
+			var anchorElem = isNum || !anchor.tagName ? null : anchor;
+			if (!isNum && !anchorElem) return;
+			var startLocation = window.pageYOffset; // Current location on the page
+			if (_settings.header && !fixedHeader) {
+				// Get the fixed header if not already set
+				fixedHeader = document.querySelector(_settings.header);
+			}
+			var headerHeight = getHeaderHeight(fixedHeader);
+			var endLocation = isNum ? anchor : getEndLocation(anchorElem, headerHeight, parseInt((typeof _settings.offset === 'function' ? _settings.offset(anchor, toggle) : _settings.offset), 10), _settings.clip); // Location to scroll to
+			var distance = endLocation - startLocation; // distance to travel
+			var documentHeight = getDocumentHeight();
+			var timeLapsed = 0;
+			var speed = getSpeed(distance, _settings);
+			var start, percentage, position;
+
+			/**
+			 * Stop the scroll animation when it reaches its target (or the bottom/top of page)
+			 * @param {Number} position Current position on the page
+			 * @param {Number} endLocation Scroll to location
+			 * @param {Number} animationInterval How much to scroll on this loop
+			 */
+			var stopAnimateScroll = function (position, endLocation) {
+
+				// Get the current location
+				var currentLocation = window.pageYOffset;
+
+				// Check if the end location has been reached yet (or we've hit the end of the document)
+				if (position == endLocation || currentLocation == endLocation || ((startLocation < endLocation && window.innerHeight + currentLocation) >= documentHeight)) {
+
+					// Clear the animation timer
+					smoothScroll.cancelScroll(true);
+
+					// Bring the anchored element into focus
+					adjustFocus(anchor, endLocation, isNum);
+
+					// Emit a custom event
+					emitEvent('scrollStop', _settings, anchor, toggle);
+
+					// Reset start
+					start = null;
+					animationInterval = null;
+
+					return true;
+
+				}
+			};
+
+			/**
+			 * Loop scrolling animation
+			 */
+			var loopAnimateScroll = function (timestamp) {
+				if (!start) { start = timestamp; }
+				timeLapsed += timestamp - start;
+				percentage = speed === 0 ? 0 : (timeLapsed / speed);
+				percentage = (percentage > 1) ? 1 : percentage;
+				position = startLocation + (distance * easingPattern(_settings, percentage));
+				window.scrollTo(0, Math.floor(position));
+				if (!stopAnimateScroll(position, endLocation)) {
+					animationInterval = window.requestAnimationFrame(loopAnimateScroll);
+					start = timestamp;
+				}
+			};
+
+			/**
+			 * Reset position to fix weird iOS bug
+			 * @link https://github.com/cferdinandi/smooth-scroll/issues/45
+			 */
+			if (window.pageYOffset === 0) {
+				window.scrollTo(0, 0);
+			}
+
+			// Update the URL
+			updateURL(anchor, isNum, _settings);
+
+			// If the user prefers reduced motion, jump to location
+			if (reduceMotion()) {
+				window.scrollTo(0, Math.floor(endLocation));
+				return;
+			}
+
+			// Emit a custom event
+			emitEvent('scrollStart', _settings, anchor, toggle);
+
+			// Start scrolling animation
+			smoothScroll.cancelScroll(true);
+			window.requestAnimationFrame(loopAnimateScroll);
+
+		};
+
+		/**
+		 * If smooth scroll element clicked, animate scroll
+		 */
+		var clickHandler = function (event) {
+
+			// Don't run if event was canceled but still bubbled up
+			// By @mgreter - https://github.com/cferdinandi/smooth-scroll/pull/462/
+			if (event.defaultPrevented) return;
+
+			// Don't run if right-click or command/control + click or shift + click
+			if (event.button !== 0 || event.metaKey || event.ctrlKey || event.shiftKey) return;
+
+			// Check if event.target has closest() method
+			// By @totegi - https://github.com/cferdinandi/smooth-scroll/pull/401/
+			if (!('closest' in event.target)) return;
+
+			// Check if a smooth scroll link was clicked
+			toggle = event.target.closest(selector);
+			if (!toggle || toggle.tagName.toLowerCase() !== 'a' || event.target.closest(settings.ignore)) return;
+
+			// Only run if link is an anchor and points to the current page
+			if (toggle.hostname !== window.location.hostname || toggle.pathname !== window.location.pathname || !/#/.test(toggle.href)) return;
+
+			// Get an escaped version of the hash
+			var hash = escapeCharacters(toggle.hash);
+
+			// Get the anchored element
+			var anchor;
+			if (hash === '#') {
+				if (!settings.topOnEmptyHash) return;
+				anchor = document.documentElement;
+			} else {
+				anchor = document.querySelector(hash);
+			}
+			anchor = !anchor && hash === '#top' ? document.documentElement : anchor;
+
+			// If anchored element exists, scroll to it
+			if (!anchor) return;
+			event.preventDefault();
+			setHistory(settings);
+			smoothScroll.animateScroll(anchor, toggle);
+
+		};
+
+		/**
+		 * Animate scroll on popstate events
+		 */
+		var popstateHandler = function (event) {
+
+			// Stop if history.state doesn't exist (ex. if clicking on a broken anchor link).
+			// fixes `Cannot read property 'smoothScroll' of null` error getting thrown.
+			if (history.state === null) return;
+
+			// Only run if state is a popstate record for this instantiation
+			if (!history.state.smoothScroll || history.state.smoothScroll !== JSON.stringify(settings)) return;
+
+			// Only run if state includes an anchor
+
+			// if (!history.state.anchor && history.state.anchor !== 0) return;
+
+			// Get the anchor
+			var anchor = history.state.anchor;
+			if (typeof anchor === 'string' && anchor) {
+				anchor = document.querySelector(escapeCharacters(history.state.anchor));
+				if (!anchor) return;
+			}
+
+			// Animate scroll to anchor link
+			smoothScroll.animateScroll(anchor, null, {updateURL: false});
+
+		};
+
+		/**
+		 * Destroy the current initialization.
+		 */
+		smoothScroll.destroy = function () {
+
+			// If plugin isn't already initialized, stop
+			if (!settings) return;
+
+			// Remove event listeners
+			document.removeEventListener('click', clickHandler, false);
+			window.removeEventListener('popstate', popstateHandler, false);
+
+			// Cancel any scrolls-in-progress
+			smoothScroll.cancelScroll();
+
+			// Reset variables
+			settings = null;
+			anchor = null;
+			toggle = null;
+			fixedHeader = null;
+			eventTimeout = null;
+			animationInterval = null;
+
+		};
+
+		/**
+		 * Initialize Smooth Scroll
+		 * @param {Object} options User settings
+		 */
+		var init = function () {
+
+			// feature test
+			if (!supports()) throw 'Smooth Scroll: This browser does not support the required JavaScript methods and browser APIs.';
+
+			// Destroy any existing initializations
+			smoothScroll.destroy();
+
+			// Selectors and variables
+			settings = extend(defaults, options || {}); // Merge user options with defaults
+			fixedHeader = settings.header ? document.querySelector(settings.header) : null; // Get the fixed header
+
+			// When a toggle is clicked, run the click handler
+			document.addEventListener('click', clickHandler, false);
+
+			// If updateURL and popState are enabled, listen for pop events
+			if (settings.updateURL && settings.popstate) {
+				window.addEventListener('popstate', popstateHandler, false);
+			}
+
+		};
+
+
+		//
+		// Initialize plugin
+		//
+
+		init();
+
+
+		//
+		// Public APIs
+		//
+
+		return smoothScroll;
+
+	};
+
+	return SmoothScroll;
+
+}));

plugins/smooth-scroll/LICENSE.md

@@ -0,0 +1,21 @@
+# The MIT License (MIT)
+
+Copyright (c) Go Make Things, LLC
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

plugins/smooth-scroll/README.md

@@ -0,0 +1,390 @@
+# Smooth Scroll [![Build Status](https://travis-ci.org/cferdinandi/smooth-scroll.svg)](https://travis-ci.org/cferdinandi/smooth-scroll)
+A lightweight script to animate scrolling to anchor links. Smooth Scroll works great with [Gumshoe](https://github.com/cferdinandi/gumshoe).
+
+**[View the Demo on CodePen →](https://codepen.io/cferdinandi/pen/wQzrdM)**
+
+[Getting Started](#getting-started) | [Scroll Speed](#scroll-speed) | [Easing Options](#easing-options) | [API](#api) | [What's new?](#whats-new) | [Known Issues](#known-issues) | [Browser Compatibility](#browser-compatibility) | [License](#license)
+
+*__Quick aside:__ you might not need this library. There's [a native CSS way to handle smooth scrolling](https://gomakethings.com/smooth-scrolling-links-with-only-css/) that might fit your needs.*
+
+
+<hr>
+
+### Want to learn how to write your own vanilla JS plugins? Check out my [Vanilla JS Pocket Guides](https://vanillajsguides.com/) or join the [Vanilla JS Academy](https://vanillajsacademy.com) and level-up as a web developer. 🚀
+
+<hr>
+
+
+## Getting Started
+
+Compiled and production-ready code can be found in the `dist` directory. The `src` directory contains development code.
+
+### 1. Include Smooth Scroll on your site.
+
+There are two versions of Smooth Scroll: the standalone version, and one that comes preloaded with polyfills for `closest()`, `requestAnimationFrame()`, and `CustomEvent()`, which are only supported in newer browsers.
+
+If you're including your own polyfills or don't want to enable this feature for older browsers, use the standalone version. Otherwise, use the version with polyfills.
+
+**Direct Download**
+
+You can [download the files directly from GitHub](https://github.com/cferdinandi/smooth-scroll/archive/master.zip).
+
+```html
+<script src="path/to/smooth-scroll.polyfills.min.js"></script>
+```
+
+**CDN**
+
+You can also use the [jsDelivr CDN](https://cdn.jsdelivr.net/gh/cferdinandi/smooth-scroll/dist/). I recommend linking to a specific version number or version range to prevent major updates from breaking your site. Smooth Scroll uses semantic versioning.
+
+```html
+<!-- Always get the latest version -->
+<!-- Not recommended for production sites! -->
+<script src="https://cdn.jsdelivr.net/gh/cferdinandi/smooth-scroll/dist/smooth-scroll.polyfills.min.js"></script>
+
+<!-- Get minor updates and patch fixes within a major version -->
+<script src="https://cdn.jsdelivr.net/gh/cferdinandi/smooth-scroll@15/dist/smooth-scroll.polyfills.min.js"></script>
+
+<!-- Get patch fixes within a minor version -->
+<script src="https://cdn.jsdelivr.net/gh/cferdinandi/smooth-scroll@15.0/dist/smooth-scroll.polyfills.min.js"></script>
+
+<!-- Get a specific version -->
+<script src="https://cdn.jsdelivr.net/gh/cferdinandi/smooth-scroll@15.0.0/dist/smooth-scroll.polyfills.min.js"></script>
+```
+
+**NPM**
+
+You can also use NPM (or your favorite package manager).
+
+```bash
+npm install smooth-scroll
+```
+
+### 2. Add the markup to your HTML.
+
+No special markup needed&mdash;just standard anchor links. Give the anchor location an ID just like you normally would.
+
+```html
+<a data-scroll href="#bazinga">Anchor Link</a>
+...
+<div id="bazinga">Bazinga!</div>
+```
+
+***Note:*** *Smooth Scroll does not work with `<a name="anchor"></a>` style anchors. It requires IDs.*
+
+### 3. Initialize Smooth Scroll.
+
+In the footer of your page, after the content, initialize Smooth Scroll by passing in a selector for the anchor links that should be animated. And that's it, you're done. Nice work!
+
+```html
+<script>
+	var scroll = new SmoothScroll('a[href*="#"]');
+</script>
+```
+
+***Note:*** *The `a[href*="#"]` selector will apply Smooth Scroll to all anchor links. You can selectively target links using any other selector(s) you'd like. Smooth Scroll accepts multiple selectors as a comma separated list. Example: `'.js-scroll, [data-scroll], #some-link'`.*
+
+
+
+## Scroll Speed
+
+Smooth Scroll allows you to adjust the speed of your animations with the `speed` option.
+
+This a number representing the amount of time in milliseconds that it should take to scroll 1000px. Scroll distances shorter than that will take less time, and scroll distances longer than that will take more time. The default is 300ms.
+
+```js
+var scroll = new SmoothScroll('a[href*="#"]', {
+	speed: 300
+});
+```
+
+If you want all of your animations to take exactly the same amount of time (the value you set for `speed`), set the `speedAsDuration` option to `true`.
+
+```js
+// All animations will take exactly 500ms
+var scroll = new SmoothScroll('a[href*="#"]', {
+	speed: 500,
+	speedAsDuration: true
+});
+```
+
+
+## Easing Options
+
+Smooth Scroll comes with about a dozen common easing patterns. [Here's a demo of the different patterns.](https://codepen.io/cferdinandi/pen/jQMGaB)
+
+**Linear**
+*Moves at the same speed from start to finish.*
+
+- `Linear`
+
+
+**Ease-In**
+*Gradually increases in speed.*
+
+- `easeInQuad`
+- `easeInCubic`
+- `easeInQuart`
+- `easeInQuint`
+
+
+**Ease-In-Out**
+*Gradually increases in speed, peaks, and then gradually slows down.*
+
+- `easeInOutQuad`
+- `easeInOutCubic`
+- `easeInOutQuart`
+- `easeInOutQuint`
+
+
+**Ease-Out**
+*Gradually decreases in speed.*
+
+- `easeOutQuad`
+- `easeOutCubic`
+- `easeOutQuart`
+- `easeOutQuint`
+
+
+You can also pass in your own custom easing pattern [using the `customEasing` option](#global-settings).
+
+```js
+var scroll = new SmoothScroll('a[href*="#"]', {
+	// Function. Custom easing pattern
+	// If this is set to anything other than null, will override the easing option above
+	customEasing: function (time) {
+
+		// return <your formulate with time as a multiplier>
+
+		// Example: easeInOut Quad
+		return time < 0.5 ? 2 * time * time : -1 + (4 - 2 * time) * time;
+
+	}
+});
+```
+
+
+
+## API
+
+Smooth Scroll includes smart defaults and works right out of the box. But if you want to customize things, it also has a robust API that provides multiple ways for you to adjust the default options and settings.
+
+### Options and Settings
+
+You can pass options and callbacks into Smooth Scroll when instantiating.
+
+```javascript
+var scroll = new SmoothScroll('a[href*="#"]', {
+
+	// Selectors
+	ignore: '[data-scroll-ignore]', // Selector for links to ignore (must be a valid CSS selector)
+	header: null, // Selector for fixed headers (must be a valid CSS selector)
+	topOnEmptyHash: true, // Scroll to the top of the page for links with href="#"
+
+	// Speed & Duration
+	speed: 500, // Integer. Amount of time in milliseconds it should take to scroll 1000px
+	speedAsDuration: false, // If true, use speed as the total duration of the scroll animation
+	durationMax: null, // Integer. The maximum amount of time the scroll animation should take
+	durationMin: null, // Integer. The minimum amount of time the scroll animation should take
+	clip: true, // If true, adjust scroll distance to prevent abrupt stops near the bottom of the page
+	offset: function (anchor, toggle) {
+
+		// Integer or Function returning an integer. How far to offset the scrolling anchor location in pixels
+		// This example is a function, but you could do something as simple as `offset: 25`
+
+		// An example returning different values based on whether the clicked link was in the header nav or not
+		if (toggle.classList.closest('.my-header-nav')) {
+			return 25;
+		} else {
+			return 50;
+		}
+
+	},
+
+	// Easing
+	easing: 'easeInOutCubic', // Easing pattern to use
+	customEasing: function (time) {
+
+		// Function. Custom easing pattern
+		// If this is set to anything other than null, will override the easing option above
+
+		// return <your formulate with time as a multiplier>
+
+		// Example: easeInOut Quad
+		return time < 0.5 ? 2 * time * time : -1 + (4 - 2 * time) * time;
+
+	},
+
+	// History
+	updateURL: true, // Update the URL on scroll
+	popstate: true, // Animate scrolling with the forward/backward browser buttons (requires updateURL to be true)
+
+	// Custom Events
+	emitEvents: true // Emit custom events
+
+});
+```
+
+### Custom Events
+
+Smooth Scroll emits three custom events:
+
+- `scrollStart` is emitted when the scrolling animation starts.
+- `scrollStop` is emitted when the scrolling animation stops.
+- `scrollCancel` is emitted if the scrolling animation is canceled.
+
+All three events are emitted on the `document` element and bubble up. You can listen for them with the `addEventListener()` method. The `event.detail` object includes the `anchor` and `toggle` elements for the animation.
+
+```js
+// Log scroll events
+var logScrollEvent = function (event) {
+
+	// The event type
+	console.log('type:', event.type);
+
+	// The anchor element being scrolled to
+	console.log('anchor:', event.detail.anchor);
+
+	// The anchor link that triggered the scroll
+	console.log('toggle:', event.detail.toggle);
+
+};
+
+// Listen for scroll events
+document.addEventListener('scrollStart', logScrollEvent, false);
+document.addEventListener('scrollStop', logScrollEvent, false);
+document.addEventListener('scrollCancel', logScrollEvent, false);
+```
+
+### Methods
+
+Smooth Scroll also exposes several public methods.
+
+#### animateScroll()
+Animate scrolling to an anchor.
+
+```javascript
+var scroll = new SmoothScroll();
+scroll.animateScroll(
+	anchor, // Node to scroll to. ex. document.querySelector('#bazinga')
+	toggle, // Node that toggles the animation, OR an integer. ex. document.querySelector('#toggle')
+	options // Classes and callbacks. Same options as those passed into the init() function.
+);
+```
+
+**Example 1**
+
+```javascript
+var scroll = new SmoothScroll();
+var anchor = document.querySelector('#bazinga');
+scroll.animateScroll(anchor);
+```
+
+**Example 2**
+
+```javascript
+var scroll = new SmoothScroll();
+var anchor = document.querySelector('#bazinga');
+var toggle = document.querySelector('#toggle');
+var options = { speed: 1000, easing: 'easeOutCubic' };
+scroll.animateScroll(anchor, toggle, options);
+```
+
+**Example 3**
+
+```javascript
+// You can optionally pass in a y-position to scroll to as an integer
+var scroll = new SmoothScroll();
+scroll.animateScroll(750);
+```
+
+#### cancelScroll()
+Cancel a scroll-in-progress.
+
+```javascript
+var scroll = new SmoothScroll();
+scroll.cancelScroll();
+```
+
+***Note:*** *This does not handle focus management. The user will stop in place, and focus will remain on the anchor link that triggered the scroll.*
+
+#### destroy()
+Destroy the current initialization. This is called automatically in the `init` method to remove any existing initializations.
+
+```javascript
+var scroll = new SmoothScroll();
+scroll.destroy();
+```
+
+
+### Fixed Headers
+
+If you're using a fixed header, Smooth Scroll will automatically offset scroll distances by the header height. Pass in a valid CSS selector for your fixed header as an option to the `init`.
+
+If you have multiple fixed headers, pass in the last one in the markup.
+
+```html
+<nav data-scroll-header>
+	...
+</nav>
+...
+<script>
+	var scroll = new SmoothScroll('.some-selector',{
+		header: '[data-scroll-header]'
+	});
+</script>
+```
+
+
+
+## What's new?
+
+Scroll duration now varies based on distance traveled. If you want to maintain the old scroll animation duration behavior, set the `speedAsDuration` option to `true`.
+
+
+
+## Known Issues
+
+### Reduce Motion Settings
+
+This isn't really an "issue" so-much as a question I get a lot.
+
+Smooth Scroll respects [the `Reduce Motion` setting](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion) available in certain operating systems. In browsers that surface that setting, Smooth Scroll will not run and will revert to the default "jump to location" anchor link behavior.
+
+I've decided to respect user preferences of developer desires here. This is *not* a configurable setting.
+
+### `<body>` styling
+
+If the `<body>` element has been assigned a height of `100%` or `overflow: hidden`, Smooth Scroll is unable to properly calculate page distances and will not scroll to the right location. The `<body>` element can have a fixed, non-percentage based height (ex. `500px`), or a height of `auto`, and an `overflow` of `visible`.
+
+### Animating from the bottom
+
+Animated scrolling links at the very bottom of the page (example: a "scroll to top" link) will stop animated almost immediately after they start when using certain easing patterns. This is an issue that's been around for a while and I've yet to find a good fix for it. I've found that `easeOut*` easing patterns work as expected, but other patterns can cause issues. [See this discussion for more details.](https://github.com/cferdinandi/smooth-scroll/issues/49)
+
+### Scrolling to an anchor link on another page
+
+This, unfortunately, cannot be done well.
+
+Most browsers instantly jump you to the anchor location when you load a page. You could use `scrollTo(0, 0)` to pull users back up to the top, and then manually use the `animateScroll()` method, but in my experience, it results in a visible jump on the page that's a worse experience than the default browser behavior.
+
+
+
+## Browser Compatibility
+
+Smooth Scroll works in all modern browsers, and IE 9 and above.
+
+Smooth Scroll is built with modern JavaScript APIs, and uses progressive enhancement. If the JavaScript file fails to load, or if your site is viewed on older and less capable browsers, anchor links will jump the way they normally would.
+
+*__Note:__ Smooth Scroll will not run&mdash;even in supported browsers&mdash;if users have `Reduce Motion` enabled. [Learn more in the "Known Issues" section.](#reduce-motion-settings)*
+
+### Polyfills
+
+Support back to IE9 requires polyfills for `closest()`, `requestAnimationFrame()`, and `CustomEvent()`. Without them, support starts with Edge.
+
+Use the included polyfills version of Smooth Scroll, or include your own.
+
+
+
+## License
+
+The code is available under the [MIT License](LICENSE.md).

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