diff --git a/_includes/scripts.html b/_includes/scripts.html
index fffbc72fc0ed..12340ce3eded 100644
--- a/_includes/scripts.html
+++ b/_includes/scripts.html
@@ -9,7 +9,7 @@
   {% endfor %}
 {% else %}
   <script src="{{ '/assets/js/main.min.js' | relative_url }}"></script>
-  <script data-search-pseudo-elements defer src="https://use.fontawesome.com/releases/v5.7.1/js/all.js" integrity="sha384-eVEQC9zshBn0rFj4+TU78eNA19HMNigMviK/PU/FFjLXqa/GKPgX58rvt5Z8PLs7" crossorigin="anonymous"></script>
+  <script defer src="https://use.fontawesome.com/releases/v5.7.1/js/all.js" integrity="sha384-eVEQC9zshBn0rFj4+TU78eNA19HMNigMviK/PU/FFjLXqa/GKPgX58rvt5Z8PLs7" crossorigin="anonymous"></script>
 {% endif %}
 
 {% if site.search == true or page.layout == "search" %}
diff --git a/assets/js/_main.js b/assets/js/_main.js
index 39ee5fbaaba9..f231863443ea 100644
--- a/assets/js/_main.js
+++ b/assets/js/_main.js
@@ -5,13 +5,15 @@
 $(document).ready(function() {
   // Sticky footer
   var bumpIt = function() {
-      $("body").css("margin-bottom", $(".page__footer").outerHeight(true));
-    };
+    $("body").css("margin-bottom", $(".page__footer").outerHeight(true));
+  };
 
   bumpIt();
-  $(window).resize(jQuery.throttle(250, function() {
-    bumpIt();
-  }));
+  $(window).resize(
+    jQuery.throttle(250, function() {
+      bumpIt();
+    })
+  );
 
   // FitVids init
   $("#main").fitVids();
@@ -64,65 +66,30 @@ $(document).ready(function() {
   });
 
   // Smooth scrolling
-
-  // Bind popstate event listener to support back/forward buttons.
-  var smoothScrolling = false;
-  $(window).bind("popstate", function (event) {
-    $.smoothScroll({
-      scrollTarget: decodeURI(location.hash),
-      offset: -20,
-      beforeScroll: function() { smoothScrolling = true; },
-      afterScroll: function() { smoothScrolling = false; }
-    });
+  var scroll = new SmoothScroll('a[href*="#"]', {
+    offset: 20,
+    speed: 400,
+    speedAsDuration: true,
+    durationMax: 500
   });
-  // Override clicking on links to smooth scroll
-  $('a[href*="#"]').bind("click", function (event) {
-    if (this.pathname === location.pathname && this.hash) {
-      event.preventDefault();
-      history.pushState(null, null, this.hash);
-      $(window).trigger("popstate");
-    }
+
+  // Gumshoe scroll spy init
+  var spy = new Gumshoe("nav.toc a", {
+    // Active classes
+    navClass: "active", // applied to the nav list item
+    contentClass: "active", // applied to the content
+
+    // Nested navigation
+    nested: false, // if true, add classes to parents of active link
+    nestedClass: "active", // applied to the parent items
+
+    // Offset & reflow
+    offset: 20, // how far from the top of the page to activate a content area
+    reflow: true, // if true, listen for reflows
+
+    // Event support
+    events: true // if true, emit custom events
   });
-  // Smooth scroll on page load if there is a hash in the URL.
-  if (location.hash) {
-    $(window).trigger("popstate");
-  }
-
-  // Scrollspy equivalent: update hash fragment while scrolling.
-  $(window).scroll(jQuery.throttle(250, function() {
-    // Don't run while smooth scrolling (from clicking on a link).
-    if (smoothScrolling) return;
-    var scrollTop = $(window).scrollTop() + 20 + 1;  // 20 = offset
-    var links = [];
-    $("nav.toc a").each(function() {
-      var link = $(this);
-      var href = link.attr("href");
-      if (href && href[0] == "#") {
-        var element = $(href);
-        links.push({
-          link: link,
-          href: href,
-          top: element.offset().top
-        });
-        link.removeClass('active');
-      }
-    });
-    for (var i = 0; i < links.length; i++) {
-      var top = links[i].top;
-      var bottom = (i < links.length - 1 ? links[i+1].top : Infinity);
-      if (top <= scrollTop && scrollTop < bottom) {
-        // Mark all ancestors as active
-        links[i].link.parents("li").children("a").addClass('active');
-        if (links[i].href !== decodeURI(location.hash)) {
-          history.replaceState(null, null, links[i].href);
-        }
-        return;
-      }
-    }
-    if ('#' !== location.hash) {
-      history.replaceState(null, null, '#');
-    }
-  }));
 
   // add lightbox class to all image links
   $(
diff --git a/assets/js/main.min.js b/assets/js/main.min.js
index af396493ca0f..0e60ef5a9b32 100755
--- a/assets/js/main.min.js
+++ b/assets/js/main.min.js
@@ -3,7 +3,4 @@
  * Copyright 2013-2019 Michael Rose - mademistakes.com | @mmistakes
  * Licensed under MIT
  */
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\ No newline at end of file
diff --git a/assets/js/plugins/gumshoe.js b/assets/js/plugins/gumshoe.js
new file mode 100644
index 000000000000..4420a9b73e3d
--- /dev/null
+++ b/assets/js/plugins/gumshoe.js
@@ -0,0 +1,482 @@
+/*!
+ * gumshoejs v5.1.0
+ * A simple, framework-agnostic scrollspy script.
+ * (c) 2019 Chris Ferdinandi
+ * MIT License
+ * http://github.com/cferdinandi/gumshoe
+ */
+
+(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.Gumshoe = factory(root);
+	}
+})(typeof global !== 'undefined' ? global : typeof window !== 'undefined' ? window : this, (function (window) {
+
+	'use strict';
+
+	//
+	// Defaults
+	//
+
+	var defaults = {
+
+		// Active classes
+		navClass: 'active',
+		contentClass: 'active',
+
+		// Nested navigation
+		nested: false,
+		nestedClass: 'active',
+
+		// Offset & reflow
+		offset: 0,
+		reflow: false,
+
+		// Event support
+		events: true
+
+	};
+
+
+	//
+	// Methods
+	//
+
+	/**
+	 * 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;
+	};
+
+	/**
+	 * Emit a custom event
+	 * @param  {String} type   The event type
+	 * @param  {Node}   elem   The element to attach the event to
+	 * @param  {Object} detail Any details to pass along with the event
+	 */
+	var emitEvent = function (type, elem, detail) {
+
+		// Make sure events are enabled
+		if (!detail.settings.events) return;
+
+		// Create a new event
+		var event = new CustomEvent(type, {
+			bubbles: true,
+			cancelable: true,
+			detail: detail
+		});
+
+		// Dispatch the event
+		elem.dispatchEvent(event);
+
+	};
+
+	/**
+	 * Get an element's distance from the top of the Document.
+	 * @param  {Node} elem The element
+	 * @return {Number}    Distance from the top in pixels
+	 */
+	var getOffsetTop = function (elem) {
+		var location = 0;
+		if (elem.offsetParent) {
+			while (elem) {
+				location += elem.offsetTop;
+				elem = elem.offsetParent;
+			}
+		}
+		return location >= 0 ? location : 0;
+	};
+
+	/**
+	 * Sort content from first to last in the DOM
+	 * @param  {Array} contents The content areas
+	 */
+	var sortContents = function (contents) {
+		contents.sort((function (item1, item2) {
+			var offset1 = getOffsetTop(item1.content);
+			var offset2 = getOffsetTop(item2.content);
+			if (offset1 < offset2) return -1;
+			return 1;
+		}));
+	};
+
+	/**
+	 * Get the offset to use for calculating position
+	 * @param  {Object} settings The settings for this instantiation
+	 * @return {Float}           The number of pixels to offset the calculations
+	 */
+	var getOffset = function (settings) {
+
+		// if the offset is a function run it
+		if (typeof settings.offset === 'function') {
+			return parseFloat(settings.offset());
+		}
+
+		// Otherwise, return it as-is
+		return parseFloat(settings.offset);
+
+	};
+
+	/**
+	 * Get the document element's height
+	 * @private
+	 * @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
+		);
+	};
+
+	/**
+	 * Determine if an element is in view
+	 * @param  {Node}    elem     The element
+	 * @param  {Object}  settings The settings for this instantiation
+	 * @param  {Boolean} bottom   If true, check if element is above bottom of viewport instead
+	 * @return {Boolean}          Returns true if element is in the viewport
+	 */
+	var isInView = function (elem, settings, bottom) {
+		var bounds = elem.getBoundingClientRect();
+		var offset = getOffset(settings);
+		if (bottom) {
+			return parseInt(bounds.bottom, 10) < (window.innerHeight || document.documentElement.clientHeight);
+		}
+		return parseInt(bounds.top, 10) <= offset;
+	};
+
+	/**
+	 * Check if at the bottom of the viewport
+	 * @return {Boolean} If true, page is at the bottom of the viewport
+	 */
+	var isAtBottom = function () {
+		if (window.innerHeight + window.pageYOffset >= getDocumentHeight()) return true;
+		return false;
+	};
+
+	/**
+	 * Check if the last item should be used (even if not at the top of the page)
+	 * @param  {Object} item     The last item
+	 * @param  {Object} settings The settings for this instantiation
+	 * @return {Boolean}         If true, use the last item
+	 */
+	var useLastItem = function (item, settings) {
+		if (isAtBottom() && isInView(item.content, settings, true)) return true;
+		return false;
+	};
+
+	/**
+	 * Get the active content
+	 * @param  {Array}  contents The content areas
+	 * @param  {Object} settings The settings for this instantiation
+	 * @return {Object}          The content area and matching navigation link
+	 */
+	var getActive = function (contents, settings) {
+		var last = contents[contents.length-1];
+		if (useLastItem(last, settings)) return last;
+		for (var i = contents.length - 1; i >= 0; i--) {
+			if (isInView(contents[i].content, settings)) return contents[i];
+		}
+	};
+
+	/**
+	 * Deactivate parent navs in a nested navigation
+	 * @param  {Node}   nav      The starting navigation element
+	 * @param  {Object} settings The settings for this instantiation
+	 */
+	var deactivateNested = function (nav, settings) {
+
+		// If nesting isn't activated, bail
+		if (!settings.nested) return;
+
+		// Get the parent navigation
+		var li = nav.parentNode.closest('li');
+		if (!li) return;
+
+		// Remove the active class
+		li.classList.remove(settings.nestedClass);
+
+		// Apply recursively to any parent navigation elements
+		deactivateNested(li, settings);
+
+	};
+
+	/**
+	 * Deactivate a nav and content area
+	 * @param  {Object} items    The nav item and content to deactivate
+	 * @param  {Object} settings The settings for this instantiation
+	 */
+	var deactivate = function (items, settings) {
+
+		// Make sure their are items to deactivate
+		if (!items) return;
+
+		// Get the parent list item
+		var li = items.nav.closest('li');
+		if (!li) return;
+
+		// Remove the active class from the nav and content
+		li.classList.remove(settings.navClass);
+		items.content.classList.remove(settings.contentClass);
+
+		// Deactivate any parent navs in a nested navigation
+		deactivateNested(li, settings);
+
+		// Emit a custom event
+		emitEvent('gumshoeDeactivate', li, {
+			link: items.nav,
+			content: items.content,
+			settings: settings
+		});
+
+	};
+
+
+	/**
+	 * Activate parent navs in a nested navigation
+	 * @param  {Node}   nav      The starting navigation element
+	 * @param  {Object} settings The settings for this instantiation
+	 */
+	var activateNested = function (nav, settings) {
+
+		// If nesting isn't activated, bail
+		if (!settings.nested) return;
+
+		// Get the parent navigation
+		var li = nav.parentNode.closest('li');
+		if (!li) return;
+
+		// Add the active class
+		li.classList.add(settings.nestedClass);
+
+		// Apply recursively to any parent navigation elements
+		activateNested(li, settings);
+
+	};
+
+	/**
+	 * Activate a nav and content area
+	 * @param  {Object} items    The nav item and content to activate
+	 * @param  {Object} settings The settings for this instantiation
+	 */
+	var activate = function (items, settings) {
+
+		// Make sure their are items to activate
+		if (!items) return;
+
+		// Get the parent list item
+		var li = items.nav.closest('li');
+		if (!li) return;
+
+		// Add the active class to the nav and content
+		li.classList.add(settings.navClass);
+		items.content.classList.add(settings.contentClass);
+
+		// Activate any parent navs in a nested navigation
+		activateNested(li, settings);
+
+		// Emit a custom event
+		emitEvent('gumshoeActivate', li, {
+			link: items.nav,
+			content: items.content,
+			settings: settings
+		});
+
+	};
+
+	/**
+	 * Create the Constructor object
+	 * @param {String} selector The selector to use for navigation items
+	 * @param {Object} options  User options and settings
+	 */
+	var Constructor = function (selector, options) {
+
+		//
+		// Variables
+		//
+
+		var publicAPIs = {};
+		var navItems, contents, current, timeout, settings;
+
+
+		//
+		// Methods
+		//
+
+		/**
+		 * Set variables from DOM elements
+		 */
+		publicAPIs.setup = function () {
+
+			// Get all nav items
+			navItems = document.querySelectorAll(selector);
+
+			// Create contents array
+			contents = [];
+
+			// Loop through each item, get it's matching content, and push to the array
+			Array.prototype.forEach.call(navItems, (function (item) {
+
+				// Get the content for the nav item
+				var content = document.getElementById(decodeURIComponent(item.hash.substr(1)));
+				if (!content) return;
+
+				// Push to the contents array
+				contents.push({
+					nav: item,
+					content: content
+				});
+
+			}));
+
+			// Sort contents by the order they appear in the DOM
+			sortContents(contents);
+
+		};
+
+		/**
+		 * Detect which content is currently active
+		 */
+		publicAPIs.detect = function () {
+
+			// Get the active content
+			var active = getActive(contents, settings);
+
+			// if there's no active content, deactivate and bail
+			if (!active) {
+				if (current) {
+					deactivate(current, settings);
+					current = null;
+				}
+				return;
+			}
+
+			// If the active content is the one currently active, do nothing
+			if (current && active.content === current.content) return;
+
+			// Deactivate the current content and activate the new content
+			deactivate(current, settings);
+			activate(active, settings);
+
+			// Update the currently active content
+			current = active;
+
+		};
+
+		/**
+		 * Detect the active content on scroll
+		 * Debounced for performance
+		 */
+		var scrollHandler = function (event) {
+
+			// If there's a timer, cancel it
+			if (timeout) {
+				window.cancelAnimationFrame(timeout);
+			}
+
+			// Setup debounce callback
+			timeout = window.requestAnimationFrame(publicAPIs.detect);
+
+		};
+
+		/**
+		 * Update content sorting on resize
+		 * Debounced for performance
+		 */
+		var resizeHandler = function (event) {
+
+			// If there's a timer, cancel it
+			if (timeout) {
+				window.cancelAnimationFrame(timeout);
+			}
+
+			// Setup debounce callback
+			timeout = window.requestAnimationFrame((function () {
+				sortContents();
+				publicAPIs.detect();
+			}));
+
+		};
+
+		/**
+		 * Destroy the current instantiation
+		 */
+		publicAPIs.destroy = function () {
+
+			// Undo DOM changes
+			if (current) {
+				deactivate(current);
+			}
+
+			// Remove event listeners
+			window.removeEventListener('scroll', scrollHandler, false);
+			if (settings.reflow) {
+				window.removeEventListener('resize', resizeHandler, false);
+			}
+
+			// Reset variables
+			contents = null;
+			navItems = null;
+			current = null;
+			timeout = null;
+			settings = null;
+
+		};
+
+		/**
+		 * Initialize the current instantiation
+		 */
+		var init = function () {
+
+			// Merge user options into defaults
+			settings = extend(defaults, options || {});
+
+			// Setup variables based on the current DOM
+			publicAPIs.setup();
+
+			// Find the currently active content
+			publicAPIs.detect();
+
+			// Setup event listeners
+			window.addEventListener('scroll', scrollHandler, false);
+			if (settings.reflow) {
+				window.addEventListener('resize', resizeHandler, false);
+			}
+
+		};
+
+
+		//
+		// Initialize and return the public APIs
+		//
+
+		init();
+		return publicAPIs;
+
+	};
+
+
+	//
+	// Return the Constructor
+	//
+
+	return Constructor;
+
+}));
\ No newline at end of file
diff --git a/assets/js/plugins/jquery.smooth-scroll.min.js b/assets/js/plugins/jquery.smooth-scroll.min.js
deleted file mode 100644
index db422a34a1bc..000000000000
--- a/assets/js/plugins/jquery.smooth-scroll.min.js
+++ /dev/null
@@ -1,9 +0,0 @@
-/*!
- * jQuery Smooth Scroll - v2.2.0 - 2017-05-05
- * https://github.com/kswedberg/jquery-smooth-scroll
- * Copyright (c) 2017 Karl Swedberg
- * Licensed MIT
- */
-
-
-!function(a){"function"==typeof define&&define.amd?define(["jquery"],a):a("object"==typeof module&&module.exports?require("jquery"):jQuery)}(function(a){var b={},c={exclude:[],excludeWithin:[],offset:0,direction:"top",delegateSelector:null,scrollElement:null,scrollTarget:null,autoFocus:!1,beforeScroll:function(){},afterScroll:function(){},easing:"swing",speed:400,autoCoefficient:2,preventDefault:!0},d=function(b){var c=[],d=!1,e=b.dir&&"left"===b.dir?"scrollLeft":"scrollTop";return this.each(function(){var b=a(this);if(this!==document&&this!==window)return!document.scrollingElement||this!==document.documentElement&&this!==document.body?void(b[e]()>0?c.push(this):(b[e](1),d=b[e]()>0,d&&c.push(this),b[e](0))):(c.push(document.scrollingElement),!1)}),c.length||this.each(function(){this===document.documentElement&&"smooth"===a(this).css("scrollBehavior")&&(c=[this]),c.length||"BODY"!==this.nodeName||(c=[this])}),"first"===b.el&&c.length>1&&(c=[c[0]]),c},e=/^([\-\+]=)(\d+)/;a.fn.extend({scrollable:function(a){var b=d.call(this,{dir:a});return this.pushStack(b)},firstScrollable:function(a){var b=d.call(this,{el:"first",dir:a});return this.pushStack(b)},smoothScroll:function(b,c){if("options"===(b=b||{}))return c?this.each(function(){var b=a(this),d=a.extend(b.data("ssOpts")||{},c);a(this).data("ssOpts",d)}):this.first().data("ssOpts");var d=a.extend({},a.fn.smoothScroll.defaults,b),e=function(b){var c=function(a){return a.replace(/(:|\.|\/)/g,"\\$1")},e=this,f=a(this),g=a.extend({},d,f.data("ssOpts")||{}),h=d.exclude,i=g.excludeWithin,j=0,k=0,l=!0,m={},n=a.smoothScroll.filterPath(location.pathname),o=a.smoothScroll.filterPath(e.pathname),p=location.hostname===e.hostname||!e.hostname,q=g.scrollTarget||o===n,r=c(e.hash);if(r&&!a(r).length&&(l=!1),g.scrollTarget||p&&q&&r){for(;l&&j<h.length;)f.is(c(h[j++]))&&(l=!1);for(;l&&k<i.length;)f.closest(i[k++]).length&&(l=!1)}else l=!1;l&&(g.preventDefault&&b.preventDefault(),a.extend(m,g,{scrollTarget:g.scrollTarget||r,link:e}),a.smoothScroll(m))};return null!==b.delegateSelector?this.off("click.smoothscroll",b.delegateSelector).on("click.smoothscroll",b.delegateSelector,e):this.off("click.smoothscroll").on("click.smoothscroll",e),this}});var f=function(a){var b={relative:""},c="string"==typeof a&&e.exec(a);return"number"==typeof a?b.px=a:c&&(b.relative=c[1],b.px=parseFloat(c[2])||0),b},g=function(b){var c=a(b.scrollTarget);b.autoFocus&&c.length&&(c[0].focus(),c.is(document.activeElement)||(c.prop({tabIndex:-1}),c[0].focus())),b.afterScroll.call(b.link,b)};a.smoothScroll=function(c,d){if("options"===c&&"object"==typeof d)return a.extend(b,d);var e,h,i,j,k=f(c),l={},m=0,n="offset",o="scrollTop",p={},q={};k.px?e=a.extend({link:null},a.fn.smoothScroll.defaults,b):(e=a.extend({link:null},a.fn.smoothScroll.defaults,c||{},b),e.scrollElement&&(n="position","static"===e.scrollElement.css("position")&&e.scrollElement.css("position","relative")),d&&(k=f(d))),o="left"===e.direction?"scrollLeft":o,e.scrollElement?(h=e.scrollElement,k.px||/^(?:HTML|BODY)$/.test(h[0].nodeName)||(m=h[o]())):h=a("html, body").firstScrollable(e.direction),e.beforeScroll.call(h,e),l=k.px?k:{relative:"",px:a(e.scrollTarget)[n]()&&a(e.scrollTarget)[n]()[e.direction]||0},p[o]=l.relative+(l.px+m+e.offset),i=e.speed,"auto"===i&&(j=Math.abs(p[o]-h[o]()),i=j/e.autoCoefficient),q={duration:i,easing:e.easing,complete:function(){g(e)}},e.step&&(q.step=e.step),h.length?h.stop().animate(p,q):g(e)},a.smoothScroll.version="2.2.0",a.smoothScroll.filterPath=function(a){return a=a||"",a.replace(/^\//,"").replace(/(?:index|default).[a-zA-Z]{3,4}$/,"").replace(/\/$/,"")},a.fn.smoothScroll.defaults=c});
\ No newline at end of file
diff --git a/assets/js/plugins/smooth-scroll.js b/assets/js/plugins/smooth-scroll.js
new file mode 100644
index 000000000000..e0cf796c03b0
--- /dev/null
+++ b/assets/js/plugins/smooth-scroll.js
@@ -0,0 +1,632 @@
+/*!
+ * smooth-scroll v15.2.1
+ * 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 (settings) {
+		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);
+
+			// 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 the user prefers reduced motion
+			if (reduceMotion(settings)) return;
+
+			// Don't run if right-click or command/control + click
+			if (event.button !== 0 || event.metaKey || event.ctrlKey) 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 = settings.topOnEmptyHash && hash === '#' ? document.documentElement : 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
+		 */
+		smoothScroll.init = function (options) {
+
+			// 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
+		//
+
+		smoothScroll.init(options);
+
+
+		//
+		// Public APIs
+		//
+
+		return smoothScroll;
+
+	};
+
+	return SmoothScroll;
+
+}));
diff --git a/package.json b/package.json
index d75e35dd3404..c3308d2e6492 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "uglify-js": "^3.4.9"
   },
   "scripts": {
-    "uglify": "uglifyjs assets/js/vendor/jquery/jquery-3.3.1.min.js assets/js/plugins/jquery.fitvids.js assets/js/plugins/jquery.greedy-navigation.js assets/js/plugins/jquery.magnific-popup.js assets/js/plugins/jquery.smooth-scroll.min.js assets/js/plugins/jquery.ba-throttle-debounce.js assets/js/_main.js -c -m -o assets/js/main.min.js",
+    "uglify": "uglifyjs assets/js/vendor/jquery/jquery-3.3.1.min.js assets/js/plugins/jquery.fitvids.js assets/js/plugins/jquery.greedy-navigation.js assets/js/plugins/jquery.magnific-popup.js assets/js/plugins/jquery.ba-throttle-debounce.js assets/js/plugins/smooth-scroll.js assets/js/plugins/gumshoe.js assets/js/_main.js -c -m -o assets/js/main.min.js",
     "add-banner": "node banner.js",
     "watch:js": "onchange \"assets/js/**/*.js\" -e \"assets/js/main.min.js\" -- npm run build:js",
     "build:js": "npm run uglify && npm run add-banner"
diff --git a/test/_posts/2016-02-24-welcome-to-jekyll.md b/test/_posts/2016-02-24-welcome-to-jekyll.md
index 0ed6b2b0b9a7..bbfca0b9c9a6 100644
--- a/test/_posts/2016-02-24-welcome-to-jekyll.md
+++ b/test/_posts/2016-02-24-welcome-to-jekyll.md
@@ -10,7 +10,9 @@ tags:
 
 You'll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in [many different ways](https://jekyllrb.com/docs/usage/), but the most common way is to run `jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.
 
-To add new posts, simply add a file in the `_posts` directory that follows the convention `YYYY-MM-DD-name-of-post.ext` and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.
+To add new posts, simply add a file in the `_posts`[^posts] directory that follows the convention `YYYY-MM-DD-name-of-post.ext` and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.
+
+[^posts]: Footnote test.
 
 Jekyll also offers powerful support for code snippets: