diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/LICENSE b/LICENSE
index 8097948..e1ec16e 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (C) 2015 Greg Denehy
+Copyright (C) 2020 Greg Denehy
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 773ed14..df87e9d 100644
--- a/README.md
+++ b/README.md
@@ -8,274 +8,276 @@ A slideout menu plugin for [Reveal.js](https://github.com/hakimel/reveal.js) to
 
 Download and install the package in your project:
 
-```bower install reveal.js-menu```
+`bower install reveal.js-menu`
 
-Add the plugin to the dependencies in your presentation, as below. 
+Add the plugin to your presentation, as below.
 
 ```javascript
-Reveal.initialize({
-	// ...
-	
-	dependencies: [
-		// ... 
-	  
-		{ src: 'bower_components/reveal.js-menu/menu.js' }
-	]
-});
+<script src="bower_components/reveal.js-menu/menu.js"></script>
+<script>
+  Reveal.initialize({
+    plugins: [ RevealMenu ]
+  });
+</script>
 ```
 
 ### npm
 
 Download and install the package in your project:
 
-```npm install --save reveal.js-menu```
+`npm install --save reveal.js-menu`
 
-Add the plugin to the dependencies in your presentation, as below. 
+Add the plugin to your presentation, as below.
 
 ```javascript
-Reveal.initialize({
-	// ...
-	
-	dependencies: [
-		// ... 
-	  
-		{ src: 'node_modules/reveal.js-menu/menu.js' }
-	]
-});
+<script src="node_modules/reveal.js-menu/menu.js"></script>
+<script>
+  Reveal.initialize({
+    plugins: [ RevealMenu ]
+  });
+</script>
 ```
 
 ### Manual
 
-Copy this repository into the plugins folder of your reveal.js presentation, ie ```plugins/menu```.
+Copy this repository into the plugins folder of your reveal.js presentation, ie `plugins/menu`.
 
-Add the plugin to the dependencies in your presentation, as below. 
+Add the plugin to the dependencies in your presentation, as below.
 
 ```javascript
-Reveal.initialize({
-	// ...
-	
-	dependencies: [
-		// ... 
-	  
-		{ src: 'plugin/menu/menu.js' }
-	]
-});
+<script src="plugin/menu/menu.js"></script>
+<script>
+  Reveal.initialize({
+    plugins: [ RevealMenu ]
+  });
+</script>
 ```
 
 ## Configuration
 
-You can configure the menu for your presentation by providing a ```menu``` option in the reveal.js initialization options. Note that all config values are optional and will default as specified below.
+You can configure the menu for your presentation by providing a `menu` option in the reveal.js initialization options. Note that all config values are optional and will default as specified below.
 
 ```javascript
 Reveal.initialize({
-	// ...
-
-	menu: {
-		// Specifies which side of the presentation the menu will 
-		// be shown. Use 'left' or 'right'.
-		side: 'left',
-
-		// Specifies the width of the menu.
-		// Can be one of the following:
-		// 'normal', 'wide', 'third', 'half', 'full', or
-		// any valid css length value
-		width: 'normal',
-
-		// Add slide numbers to the titles in the slide list.
-		// Use 'true' or format string (same as reveal.js slide numbers)
-		numbers: false,
-
-		// Specifies which slide elements will be used for generating
-		// the slide titles in the menu. The default selects the first
-		// heading element found in the slide, but you can specify any
-		// valid css selector and the text from the first matching
-		// element will be used.
-		// Note: that a section data-menu-title attribute or an element
-		// with a menu-title class will take precedence over this option
-		titleSelector: 'h1, h2, h3, h4, h5, h6',
-
-		// If slides do not have a matching title, attempt to use the
-		// start of the text content as the title instead
-		useTextContentForMissingTitles: false,
-
-		// Hide slides from the menu that do not have a title.
-		// Set to 'true' to only list slides with titles.
-		hideMissingTitles: false,
-
-		// Adds markers to the slide titles to indicate the 
-		// progress through the presentation. Set to 'false'
-		// to hide the markers.
-		markers: true,
-
-		// Specify custom panels to be included in the menu, by
-		// providing an array of objects with 'title', 'icon'
-		// properties, and either a 'src' or 'content' property.
-		custom: false,
-
-		// Specifies the themes that will be available in the themes
-		// menu panel. Set to 'true' to show the themes menu panel
-		// with the default themes list. Alternatively, provide an
-		// array to specify the themes to make available in the
-		// themes menu panel, for example...
-		// [
-		//     { name: 'Black', theme: 'css/theme/black.css' },
-		//     { name: 'White', theme: 'css/theme/white.css' },
-		//     { name: 'League', theme: 'css/theme/league.css' }
-		// ]
-		themes: false,
-
-		// Specifies the path to the default theme files. If your
-		// presentation uses a different path to the standard reveal
-		// layout then you need to provide this option, but only
-		// when 'themes' is set to 'true'. If you provide your own 
-		// list of themes or 'themes' is set to 'false' the 
-		// 'themesPath' option is ignored.
-		themesPath: 'css/theme/',
-
-		// Specifies if the transitions menu panel will be shown.
-		// Set to 'true' to show the transitions menu panel with
-		// the default transitions list. Alternatively, provide an
-		// array to specify the transitions to make available in
-		// the transitions panel, for example...
-		// ['None', 'Fade', 'Slide']
-		transitions: false,
-
-		// Adds a menu button to the slides to open the menu panel.
-		// Set to 'false' to hide the button.
-		openButton: true,
-
-		// If 'true' allows the slide number in the presentation to
-		// open the menu panel. The reveal.js slideNumber option must 
-		// be displayed for this to take effect
-		openSlideNumber: false,
-
-		// If true allows the user to open and navigate the menu using
-		// the keyboard. Standard keyboard interaction with reveal
-		// will be disabled while the menu is open.
-		keyboard: true,
-
-		// Normally the menu will close on user actions such as
-		// selecting a menu item, or clicking the presentation area.
-		// If 'true', the sticky option will leave the menu open
-		// until it is explicitly closed, that is, using the close
-		// button or pressing the ESC or m key (when the keyboard 
-		// interaction option is enabled).
-		sticky: false,
-
-		// If 'true' standard menu items will be automatically opened
-		// when navigating using the keyboard. Note: this only takes 
-		// effect when both the 'keyboard' and 'sticky' options are enabled.
-		autoOpen: true,
-
-		// If 'true' the menu will not be created until it is explicitly
-		// requested by calling RevealMenu.init(). Note this will delay
-		// the creation of all menu panels, including custom panels, and
-		// the menu button.
-		delayInit: false,
-
-		// If 'true' the menu will be shown when the menu is initialised.
-		openOnInit: false,
-
-		// By default the menu will load it's own font-awesome library
-		// icons. If your presentation needs to load a different
-		// font-awesome library the 'loadIcons' option can be set to false
-		// and the menu will not attempt to load the font-awesome library.
-		loadIcons: true
-	},
-
+  // ...
+
+  menu: {
+    // Specifies which side of the presentation the menu will
+    // be shown. Use 'left' or 'right'.
+    side: 'left',
+
+    // Specifies the width of the menu.
+    // Can be one of the following:
+    // 'normal', 'wide', 'third', 'half', 'full', or
+    // any valid css length value
+    width: 'normal',
+
+    // Add slide numbers to the titles in the slide list.
+    // Use 'true' or format string (same as reveal.js slide numbers)
+    numbers: false,
+
+    // Specifies which slide elements will be used for generating
+    // the slide titles in the menu. The default selects the first
+    // heading element found in the slide, but you can specify any
+    // valid css selector and the text from the first matching
+    // element will be used.
+    // Note: that a section data-menu-title attribute or an element
+    // with a menu-title class will take precedence over this option
+    titleSelector: 'h1, h2, h3, h4, h5, h6',
+
+    // If slides do not have a matching title, attempt to use the
+    // start of the text content as the title instead
+    useTextContentForMissingTitles: false,
+
+    // Hide slides from the menu that do not have a title.
+    // Set to 'true' to only list slides with titles.
+    hideMissingTitles: false,
+
+    // Adds markers to the slide titles to indicate the
+    // progress through the presentation. Set to 'false'
+    // to hide the markers.
+    markers: true,
+
+    // Specify custom panels to be included in the menu, by
+    // providing an array of objects with 'title', 'icon'
+    // properties, and either a 'src' or 'content' property.
+    custom: false,
+
+    // Specifies the themes that will be available in the themes
+    // menu panel. Set to 'true' to show the themes menu panel
+    // with the default themes list. Alternatively, provide an
+    // array to specify the themes to make available in the
+    // themes menu panel, for example...
+    // [
+    //     { name: 'Black', theme: 'css/theme/black.css' },
+    //     { name: 'White', theme: 'css/theme/white.css' },
+    //     { name: 'League', theme: 'css/theme/league.css' }
+    // ]
+    themes: false,
+
+    // Specifies the path to the default theme files. If your
+    // presentation uses a different path to the standard reveal
+    // layout then you need to provide this option, but only
+    // when 'themes' is set to 'true'. If you provide your own
+    // list of themes or 'themes' is set to 'false' the
+    // 'themesPath' option is ignored.
+    themesPath: 'css/theme/',
+
+    // Specifies if the transitions menu panel will be shown.
+    // Set to 'true' to show the transitions menu panel with
+    // the default transitions list. Alternatively, provide an
+    // array to specify the transitions to make available in
+    // the transitions panel, for example...
+    // ['None', 'Fade', 'Slide']
+    transitions: false,
+
+    // Adds a menu button to the slides to open the menu panel.
+    // Set to 'false' to hide the button.
+    openButton: true,
+
+    // If 'true' allows the slide number in the presentation to
+    // open the menu panel. The reveal.js slideNumber option must
+    // be displayed for this to take effect
+    openSlideNumber: false,
+
+    // If true allows the user to open and navigate the menu using
+    // the keyboard. Standard keyboard interaction with reveal
+    // will be disabled while the menu is open.
+    keyboard: true,
+
+    // Normally the menu will close on user actions such as
+    // selecting a menu item, or clicking the presentation area.
+    // If 'true', the sticky option will leave the menu open
+    // until it is explicitly closed, that is, using the close
+    // button or pressing the ESC or m key (when the keyboard
+    // interaction option is enabled).
+    sticky: false,
+
+    // If 'true' standard menu items will be automatically opened
+    // when navigating using the keyboard. Note: this only takes
+    // effect when both the 'keyboard' and 'sticky' options are enabled.
+    autoOpen: true,
+
+    // If 'true' the menu will not be created until it is explicitly
+    // requested by calling RevealMenu.init(). Note this will delay
+    // the creation of all menu panels, including custom panels, and
+    // the menu button.
+    delayInit: false,
+
+    // If 'true' the menu will be shown when the menu is initialised.
+    openOnInit: false,
+
+    // By default the menu will load it's own font-awesome library
+    // icons. If your presentation needs to load a different
+    // font-awesome library the 'loadIcons' option can be set to false
+    // and the menu will not attempt to load the font-awesome library.
+    loadIcons: true
+  }
 });
 ```
 
 ### Themes Stylesheet
 
-If you are using the themes panel you need to ensure the theme stylesheet in the presentation uses the ```id="theme"``` attribute. For example...
+If you are using the themes panel you need to ensure the theme stylesheet in the presentation uses the `id="theme"` attribute. For example...
+
 ```html
-<link rel="stylesheet" href="css/theme/black.css" id="theme">
+<link rel="stylesheet" href="css/theme/black.css" id="theme" />
 ```
 
 ## Slide Titles
 
 The slide titles used in the menu can be supplied explicitly or are taken directly from the presentation, using the following rules...
 
-###### 1. The section's ```data-menu-title``` attribute.
-If the slide's section element contains a ```data-menu-title``` attribute this will be used for the slide title in the menu. For example...
+###### 1. The section's `data-menu-title` attribute.
+
+If the slide's section element contains a `data-menu-title` attribute this will be used for the slide title in the menu. For example...
 
 ```html
 <section data-menu-title="Custom Menu Title">
-	<h1>Title</h1>
-	<p>...</p>
+  <h1>Title</h1>
+  <p>...</p>
 </section>
 ```
 
-###### 2. Any element with the class ```menu-title```.
-If the slide's section contains an element with the class ```menu-title``` then the element's text will be used for the title. The first such element found will be used if there are more than one. Note the element need not be displayed to be used. For example...
+###### 2. Any element with the class `menu-title`.
+
+If the slide's section contains an element with the class `menu-title` then the element's text will be used for the title. The first such element found will be used if there are more than one. Note the element need not be displayed to be used. For example...
 
 ```html
 <section>
-	<h1>Title</h1>
-	<span class="menu-title" style="display: none">Custom Menu Title</span>
-	<p>...</p>
+  <h1>Title</h1>
+  <span class="menu-title" style="display: none">Custom Menu Title</span>
+  <p>...</p>
 </section>
 ```
 
 ###### 3. The first heading found or a custom element selector
-The ```titleSelector``` option can be used to customise the elements that will be used to generate the slide titles in the menu. The default option selects the first heading element found in the slide. For example...
+
+The `titleSelector` option can be used to customise the elements that will be used to generate the slide titles in the menu. The default option selects the first heading element found in the slide. For example...
 
 ```html
 <section>
-	<h3>This will be the slide title in the menu</h3>
-	<h1>Title</h1>
-	<p>...</p>
+  <h3>This will be the slide title in the menu</h3>
+  <h1>Title</h1>
+  <p>...</p>
 </section>
 ```
 
-Any valid CSS selector should work but note the selector will only be applied to elements contained within the slide section. You could use the ```'h1'``` selector to only use level 1 headings or ```'p'``` to use the first paragraph element. For example, ```titleSelector: 'p.lead'``` would be used like this...
+Any valid CSS selector should work but note the selector will only be applied to elements contained within the slide section. You could use the `'h1'` selector to only use level 1 headings or `'p'` to use the first paragraph element. For example, `titleSelector: 'p.lead'` would be used like this...
 
 ```html
 <section>
-	<h1>Title</h1>
-	<p class="lead">This will be the slide title in the menu</p>
-	<p>...</p>
+  <h1>Title</h1>
+  <p class="lead">This will be the slide title in the menu</p>
+  <p>...</p>
 </section>
 ```
 
-Using ```titleSelector: ''``` will ignore all elements and no title will be provided, unless the slide section contains a ```data-menu-title``` attribute or an element with the ```menu-title``` class.
+Using `titleSelector: ''` will ignore all elements and no title will be provided, unless the slide section contains a `data-menu-title` attribute or an element with the `menu-title` class.
 
 ###### 4. No title is provided
+
 If no title can be found using the above methods, a default title incorporating the slide number will be used. For example, the following would result in a slide title in the format of 'Slide 12'...
 
 ```html
 <section>
-	<p>...</p>
+  <p>...</p>
 </section>
 ```
 
-If the ```hideMissingTitles``` option is set to ```true```, however, the slide will not be listed in the menu.
-
+If the `hideMissingTitles` option is set to `true`, however, the slide will not be listed in the menu.
 
 ## Custom Menu Panels
 
-Additional custom panels can be added the menu using the ```custom``` option.
+Additional custom panels can be added the menu using the `custom` option.
 
 ```javascript
 Reveal.initialize({
-	// ...
-
-	menu: {
-		// ...
-
-		custom: [
-			{ title: 'Links', icon: '<i class="fa fa-external-link">', src: 'links.html' },
-			{ title: 'About', icon: '<i class="fa fa-info">', content: '<p>This slidedeck is created with reveal.js</p>' }
-		]
-	}
+  // ...
+
+  menu: {
+    // ...
+
+    custom: [
+      {
+        title: 'Links',
+        icon: '<i class="fa fa-external-link">',
+        src: 'links.html'
+      },
+      {
+        title: 'About',
+        icon: '<i class="fa fa-info">',
+        content: '<p>This slidedeck is created with reveal.js</p>'
+      }
+    ]
+  }
 });
 ```
 
-```title``` and ```icon``` are used for the toolbar buttons at the top of the menu. There are two approaches you can use to provide content for the panels...
+`title` and `icon` are used for the toolbar buttons at the top of the menu. There are two approaches you can use to provide content for the panels...
 
-* You can provide a URL in ```src``` to load html from another file.
-* Alternatively, you can provide html in ```content``` and this will be added to the custom panel.
+- You can provide a URL in `src` to load html from another file.
+- Alternatively, you can provide html in `content` and this will be added to the custom panel.
 
 ###### Custom slide menu items
 
@@ -284,51 +286,57 @@ You can provide menu items in your custom panels using the following format. Thi
 ```html
 <h1>Links</h1>
 <ul class="slide-menu-items">
-	<li class="slide-menu-item"><a href="#/transitions">Transitions</a></li>
-	<li class="slide-menu-item"><a href="#/13">Code highlighting</a></li>
+  <li class="slide-menu-item"><a href="#/transitions">Transitions</a></li>
+  <li class="slide-menu-item"><a href="#/13">Code highlighting</a></li>
 </ul>
 ```
 
-You are not limited to linking to presentation slides. You can provide any link you wish. 
+You are not limited to linking to presentation slides. You can provide any link you wish.
 
 ```html
 <h1>External Links</h1>
 <ul class="slide-menu-items">
-	<li class="slide-menu-item"><a href="https://github.com/denehyg/reveal.js-menu">Reveal.js-menu</a></li>
-	<li class="slide-menu-item"><a href="https://github.com/hakimel/reveal.js">Reveal.js</a></li>
+  <li class="slide-menu-item">
+    <a href="https://github.com/denehyg/reveal.js-menu">Reveal.js-menu</a>
+  </li>
+  <li class="slide-menu-item">
+    <a href="https://github.com/hakimel/reveal.js">Reveal.js</a>
+  </li>
 </ul>
 ```
 
 Using menu items enables keyboard navigation of your links as with the other panels. However, you don't have to use menu items for your links. You can simply provide standard links and unordered lists in your html. Notice you can provide your custom menu items mixed with other html if you wish.
 
-
 ## Ready Event
 
 A 'menu-ready' event is fired when reveal.js-menu has loaded all non-async dependencies and is ready to start navigating.
 
 ```javascript
-Reveal.addEventListener( 'menu-ready', function( event ) {
-	// your code
-} );
+Reveal.addEventListener('menu-ready', function (event) {
+  // your code
+});
 ```
 
 ## API
 
 The `RevealMenu` object exposes a JavaScript API for controlling the menu:
 
-| Function                 | Description   |
-|--------------------------|---------------|
-| toggle(event)            | Toggles the open state of the menu, ie open if it is closed, and close if it is open |
-| openMenu(event)          | Opens the menu |
-| closeMenu(event, force)  | Closes the menu. To force the menu to close (ie when `sticky` option is `true`) call `closeMenu(null, true)` | 
-| openPanel(event, ref)    | Opens the menu to a specific panel, passing the name of the panel or the panel element itself |
-| isOpen()                 | Returns true if the menu is open |
-| init()                   | Initialises the menu if it has not already been initialised. Used in conjunction with the `delayInit` option |
-| isInit()                 | Returns true if the menu has been initialised |
+| Function                | Description                                                                                                  |
+| ----------------------- | ------------------------------------------------------------------------------------------------------------ |
+| toggle(event)           | Toggles the open state of the menu, ie open if it is closed, and close if it is open                         |
+| openMenu(event)         | Opens the menu                                                                                               |
+| closeMenu(event, force) | Closes the menu. To force the menu to close (ie when `sticky` option is `true`) call `closeMenu(null, true)` |
+| openPanel(event, ref)   | Opens the menu to a specific panel, passing the name of the panel or the panel element itself                |
+| isOpen()                | Returns true if the menu is open                                                                             |
+| initMenu()              | Initialises the menu if it has not already been initialised. Used in conjunction with the `delayInit` option |
+| isInit()                | Returns true if the menu has been initialised                                                                |
+
+## Compatibility
 
+reveal.js-menu v2.0 is built for reveal.js v4. It will not work with reveal.js v3. If you require a menu for reveal.js v3 you will need to install reveal.js-menu v1.2.0.
 
 ## License
 
 MIT licensed
 
-Copyright (C) 2015 Greg Denehy
+Copyright (C) 2020 Greg Denehy
diff --git a/bower.json b/bower.json
index 1baac36..38a5ed5 100644
--- a/bower.json
+++ b/bower.json
@@ -1,10 +1,10 @@
 {
   "name": "reveal.js-menu",
-  "version": "1.2.0",
+  "version": "2.0.0",
   "homepage": "https://denehyg.github.io/reveal.js-menu",
   "authors": ["Greg Denehy"],
   "description": "A slideout menu for navigating reveal.js presentations",
   "keywords": ["reveal", "menu"],
-  "license": "MIT, Copyright (C) 2016 Greg Denehy",
+  "license": "MIT, Copyright (C) 2020 Greg Denehy",
   "ignore": ["**/.*", "node_modules", "bower_components", "test", "tests"]
 }
diff --git a/gulpfile.js b/gulpfile.js
new file mode 100644
index 0000000..145736e
--- /dev/null
+++ b/gulpfile.js
@@ -0,0 +1,99 @@
+const pkg = require('./package.json');
+
+const { rollup } = require('rollup');
+const { terser } = require('rollup-plugin-terser');
+const babel = require('@rollup/plugin-babel').default;
+const commonjs = require('@rollup/plugin-commonjs');
+const resolve = require('@rollup/plugin-node-resolve').default;
+
+const gulp = require('gulp');
+
+const banner = `/*!
+* reveal.js-menu ${pkg.version}
+* ${pkg.homepage}
+* MIT licensed
+*
+* Copyright (C) 2016 Greg Denehy
+*/\n`;
+
+const babelConfig = {
+  babelHelpers: 'bundled',
+  ignore: ['node_modules'],
+  compact: false,
+  extensions: ['.js', '.html'],
+  plugins: ['transform-html-import-to-string'],
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        corejs: 3,
+        useBuiltIns: 'usage',
+        modules: false
+      }
+    ]
+  ]
+};
+
+// Our ES module bundle only targets newer browsers with
+// module support. Browsers are targeted explicitly instead
+// of using the "esmodule: true" target since that leads to
+// polyfilling older browsers and a larger bundle.
+const babelConfigESM = JSON.parse(JSON.stringify(babelConfig));
+babelConfigESM.presets[0][1].targets = {
+  browsers: [
+    'last 2 Chrome versions',
+    'not Chrome < 60',
+    'last 2 Safari versions',
+    'not Safari < 10.1',
+    'last 2 iOS versions',
+    'not iOS < 10.3',
+    'last 2 Firefox versions',
+    'not Firefox < 60',
+    'last 2 Edge versions',
+    'not Edge < 16'
+  ]
+};
+
+let cache = {};
+
+// Creates a UMD and ES module bundle for each plugin
+gulp.task('build', () => {
+  return Promise.all(
+    [
+      {
+        name: 'RevealMenu',
+        input: './plugin.js',
+        output: './menu'
+      }
+    ].map(plugin => {
+      return rollup({
+        cache: cache[plugin.input],
+        input: plugin.input,
+        plugins: [
+          resolve(),
+          commonjs(),
+          babel({
+            ...babelConfig,
+            ignore: [/node_modules\/.*/]
+          }),
+          terser()
+        ]
+      }).then(bundle => {
+        cache[plugin.input] = bundle.cache;
+        bundle.write({
+          file: plugin.output + '.esm.js',
+          name: plugin.name,
+          format: 'es'
+        });
+
+        bundle.write({
+          file: plugin.output + '.js',
+          name: plugin.name,
+          format: 'umd'
+        });
+      });
+    })
+  );
+});
+
+gulp.task('default', gulp.series('build'));
diff --git a/menu.css b/menu.css
index 0fa7af4..5a300fd 100644
--- a/menu.css
+++ b/menu.css
@@ -1,34 +1,34 @@
 .slide-menu-wrapper {
-	font-family: "Source Sans Pro", Helvetica, sans-serif;
+  font-family: 'Source Sans Pro', Helvetica, sans-serif;
 }
 
 .slide-menu-wrapper .slide-menu {
-	background-color: #333;
-	z-index: 200;
-	position: fixed;
-	top: 0;
-	width: 300px;
-	height: 100%;
-	/*overflow-y: scroll;*/
-	transition: transform 0.3s;
-  	font-size: 16px;
-  	font-weight: normal;
+  background-color: #333;
+  z-index: 200;
+  position: fixed;
+  top: 0;
+  width: 300px;
+  height: 100%;
+  /*overflow-y: scroll;*/
+  transition: transform 0.3s;
+  font-size: 16px;
+  font-weight: normal;
 }
 
 .slide-menu-wrapper .slide-menu.slide-menu--wide {
-	width: 500px;
+  width: 500px;
 }
 
 .slide-menu-wrapper .slide-menu.slide-menu--third {
-	width: 33%;
+  width: 33%;
 }
 
 .slide-menu-wrapper .slide-menu.slide-menu--half {
-	width: 50%;
+  width: 50%;
 }
 
 .slide-menu-wrapper .slide-menu.slide-menu--full {
-	width: 95%;
+  width: 95%;
 }
 
 /*
@@ -36,23 +36,23 @@
  */
 
 .slide-menu-wrapper .slide-menu-items {
-	margin: 0;
-	padding: 0;
-	width: 100%;
-	border-bottom: solid 1px #555;
+  margin: 0;
+  padding: 0;
+  width: 100%;
+  border-bottom: solid 1px #555;
 }
 
-.slide-menu-wrapper .slide-menu-item, 
+.slide-menu-wrapper .slide-menu-item,
 .slide-menu-wrapper .slide-menu-item-vertical {
-	display: block;
-	text-align: left;
-	padding: 10px 18px;
-	color: #aaa;
-	cursor: pointer;
+  display: block;
+  text-align: left;
+  padding: 10px 18px;
+  color: #aaa;
+  cursor: pointer;
 }
 
 .slide-menu-wrapper .slide-menu-item-vertical {
-	padding-left: 30px;
+  padding-left: 30px;
 }
 
 .slide-menu-wrapper .slide-menu--wide .slide-menu-item-vertical,
@@ -60,7 +60,7 @@
 .slide-menu-wrapper .slide-menu--half .slide-menu-item-vertical,
 .slide-menu-wrapper .slide-menu--full .slide-menu-item-vertical,
 .slide-menu-wrapper .slide-menu--custom .slide-menu-item-vertical {
-	padding-left: 50px;
+  padding-left: 50px;
 }
 
 .slide-menu-wrapper .slide-menu-item {
@@ -68,22 +68,22 @@
 }
 
 .slide-menu-wrapper .active-menu-panel li.selected {
-	background-color: #222;
-	color: white;
+  background-color: #222;
+  color: white;
 }
 
 .slide-menu-wrapper .active-menu-panel li.active {
-	color: #eee;
+  color: #eee;
 }
 
-.slide-menu-wrapper .slide-menu-item.no-title .slide-menu-item-title, 
+.slide-menu-wrapper .slide-menu-item.no-title .slide-menu-item-title,
 .slide-menu-wrapper .slide-menu-item-vertical.no-title .slide-menu-item-title {
-	font-style: italic;
+  font-style: italic;
 }
 
 .slide-menu-wrapper .slide-menu-item-number {
-	color: #999;
-	padding-right:6px;
+  color: #999;
+  padding-right: 6px;
 }
 
 .slide-menu-wrapper .slide-menu-item i.far,
@@ -92,8 +92,8 @@
 .slide-menu-wrapper .slide-menu-item-vertical i.fas,
 .slide-menu-wrapper .slide-menu-item svg.svg-inline--fa,
 .slide-menu-wrapper .slide-menu-item-vertical svg.svg-inline--fa {
-	padding-right: 12px;
-	display: none;
+  padding-right: 12px;
+  display: none;
 }
 
 .slide-menu-wrapper .slide-menu-item.past i.fas.past,
@@ -108,7 +108,7 @@
 .slide-menu-wrapper .slide-menu-item-vertical.active svg.svg-inline--fa.active,
 .slide-menu-wrapper .slide-menu-item.future svg.svg-inline--fa.future,
 .slide-menu-wrapper .slide-menu-item-vertical.future svg.svg-inline--fa.future {
-	display: inline-block;
+  display: inline-block;
 }
 
 .slide-menu-wrapper .slide-menu-item.past i.fas.past,
@@ -119,14 +119,14 @@
 .slide-menu-wrapper .slide-menu-item-vertical.past svg.svg-inline--fa.past,
 .slide-menu-wrapper .slide-menu-item.future svg.svg-inline--fa.future,
 .slide-menu-wrapper .slide-menu-item-vertical.future svg.svg-inline--fa.future {
-	opacity: 0.4;
+  opacity: 0.4;
 }
 
 .slide-menu-wrapper .slide-menu-item.active i.fas.active,
 .slide-menu-wrapper .slide-menu-item-vertical.active i.fas.active,
 .slide-menu-wrapper .slide-menu-item.active svg.svg-inline--fa.active,
 .slide-menu-wrapper .slide-menu-item-vertical.active svg.svg-inline--fa.active {
-	opacity: 0.8;	
+  opacity: 0.8;
 }
 
 .slide-menu-wrapper .slide-menu--left {
@@ -156,73 +156,76 @@
 }
 
 .slide-menu-wrapper {
-	transition: transform 0.3s;
+  transition: transform 0.3s;
 }
 
-
 /*
  * Toolbar
  */
 .slide-menu-wrapper .slide-menu-toolbar {
- 	height: 60px;
- 	width: 100%;
- 	font-size: 12px;
-    display: table;
-    table-layout: fixed; /* ensures equal width */
-    margin: 0;
-    padding: 0;
-	border-bottom: solid 2px #666;
+  height: 60px;
+  width: 100%;
+  font-size: 12px;
+  display: table;
+  table-layout: fixed; /* ensures equal width */
+  margin: 0;
+  padding: 0;
+  border-bottom: solid 2px #666;
 }
 
 .slide-menu-wrapper .slide-menu-toolbar > li {
-    display: table-cell;
- 	line-height: 150%;
-    text-align: center;
-    vertical-align: middle;
-    cursor: pointer;
-	color: #aaa;
-	border-radius: 3px;
-	padding-top: 16px;
+  display: table-cell;
+  line-height: 150%;
+  text-align: center;
+  vertical-align: middle;
+  cursor: pointer;
+  color: #aaa;
+  border-radius: 3px;
 }
 
 .slide-menu-wrapper .slide-menu-toolbar > li.toolbar-panel-button i,
-.slide-menu-wrapper .slide-menu-toolbar > li.toolbar-panel-button svg.svg-inline--fa {
-	font-size: 1.7em;
-}
-
-.slide-menu-wrapper .slide-menu-toolbar > li.toolbar-panel-button span.slide-menu-toolbar-label {
-	visibility: hidden;
+.slide-menu-wrapper
+  .slide-menu-toolbar
+  > li.toolbar-panel-button
+  svg.svg-inline--fa {
+  font-size: 1.7em;
 }
 
 .slide-menu-wrapper .slide-menu-toolbar > li.active-toolbar-button {
- 	color: white;
- 	text-shadow: 0 1px black;	
+  color: white;
+  text-shadow: 0 1px black;
+  text-decoration: underline;
 }
 
 .slide-menu-toolbar > li.toolbar-panel-button:hover {
-	color: white;
+  color: white;
 }
 
-.slide-menu-toolbar > li.toolbar-panel-button:hover span.slide-menu-toolbar-label,
-.slide-menu-wrapper .slide-menu-toolbar > li.active-toolbar-button span.slide-menu-toolbar-label {
-	visibility: visible;
+.slide-menu-toolbar
+  > li.toolbar-panel-button:hover
+  span.slide-menu-toolbar-label,
+.slide-menu-wrapper
+  .slide-menu-toolbar
+  > li.active-toolbar-button
+  span.slide-menu-toolbar-label {
+  visibility: visible;
 }
 
 /*
  * Panels
  */
 .slide-menu-wrapper .slide-menu-panel {
-	position: absolute;
-	width: 100%;
-	visibility: hidden;
-	height: calc(100% - 60px);
-	overflow-x: hidden;
-	overflow-y: auto;
-	color: #AAA;
+  position: absolute;
+  width: 100%;
+  visibility: hidden;
+  height: calc(100% - 60px);
+  overflow-x: hidden;
+  overflow-y: auto;
+  color: #aaa;
 }
 
 .slide-menu-wrapper .slide-menu-panel.active-menu-panel {
-	visibility: visible;
+  visibility: visible;
 }
 
 .slide-menu-wrapper .slide-menu-panel h1,
@@ -231,83 +234,82 @@
 .slide-menu-wrapper .slide-menu-panel h4,
 .slide-menu-wrapper .slide-menu-panel h5,
 .slide-menu-wrapper .slide-menu-panel h6 {
-	margin: 20px 0 10px 0;
-	color: #FFF;
-	line-height: 1.2;
-	letter-spacing: normal;
-	text-shadow: none;
+  margin: 20px 0 10px 0;
+  color: #fff;
+  line-height: 1.2;
+  letter-spacing: normal;
+  text-shadow: none;
 }
 
 .slide-menu-wrapper .slide-menu-panel h1 {
-	font-size: 1.6em;
+  font-size: 1.6em;
 }
 .slide-menu-wrapper .slide-menu-panel h2 {
-	font-size: 1.4em;
+  font-size: 1.4em;
 }
 .slide-menu-wrapper .slide-menu-panel h3 {
-	font-size: 1.3em;
+  font-size: 1.3em;
 }
 .slide-menu-wrapper .slide-menu-panel h4 {
-	font-size: 1.1em;
+  font-size: 1.1em;
 }
 .slide-menu-wrapper .slide-menu-panel h5 {
-	font-size: 1em;
+  font-size: 1em;
 }
 .slide-menu-wrapper .slide-menu-panel h6 {
-	font-size: 0.9em;
+  font-size: 0.9em;
 }
 
 .slide-menu-wrapper .slide-menu-panel p {
-	margin: 10px 0 5px 0;
+  margin: 10px 0 5px 0;
 }
 
 .slide-menu-wrapper .slide-menu-panel a {
-	color: #CCC;
-	text-decoration: underline;
+  color: #ccc;
+  text-decoration: underline;
 }
 
 .slide-menu-wrapper .slide-menu-panel a:hover {
-	color: white;
+  color: white;
 }
 
 .slide-menu-wrapper .slide-menu-item a {
-	text-decoration: none;
+  text-decoration: none;
 }
 
 .slide-menu-wrapper .slide-menu-custom-panel {
-	width: calc(100% - 20px);
-	padding-left: 10px;
-	padding-right: 10px;
+  width: calc(100% - 20px);
+  padding-left: 10px;
+  padding-right: 10px;
 }
 
 .slide-menu-wrapper .slide-menu-custom-panel .slide-menu-items {
-	width: calc(100% + 20px);
-	margin-left: -10px;
-	margin-right: 10px;
+  width: calc(100% + 20px);
+  margin-left: -10px;
+  margin-right: 10px;
 }
 
- 
 /*
  * Theme and Transitions buttons
  */
 
-.slide-menu-wrapper div[data-panel="Themes"] li,
-.slide-menu-wrapper div[data-panel="Transitions"] li {
-	display: block;
-	text-align: left;
-	cursor: pointer;
-	color: #848484;
+.slide-menu-wrapper div[data-panel='Themes'] li,
+.slide-menu-wrapper div[data-panel='Transitions'] li {
+  display: block;
+  text-align: left;
+  cursor: pointer;
+  color: #848484;
 }
 
 /*
  * Menu controls
  */
 .reveal .slide-menu-button {
-	position: fixed;
-	left: 30px;
-	bottom: 30px;
-	z-index: 30;
-	font-size: 24px;
+  position: fixed;
+  left: 30px;
+  bottom: 30px;
+  z-index: 30;
+  font-size: 24px;
 }
 
 /*
@@ -339,7 +341,6 @@
  */
 body.print-pdf .slide-menu-wrapper .slide-menu,
 body.print-pdf .reveal .slide-menu-button,
-body.print-pdf .slide-menu-wrapper .slide-menu-overlay
-{
-	display: none;
-}
\ No newline at end of file
+body.print-pdf .slide-menu-wrapper .slide-menu-overlay {
+  display: none;
+}
diff --git a/menu.esm.js b/menu.esm.js
new file mode 100644
index 0000000..9174eaa
--- /dev/null
+++ b/menu.esm.js
@@ -0,0 +1 @@
+var e="undefined"!=typeof globalThis?globalThis:"undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{};function t(e,t,n){return e(n={path:t,exports:{},require:function(e,t){return function(){throw new Error("Dynamic requires are not currently supported by @rollup/plugin-commonjs")}(null==t&&n.path)}},n.exports),n.exports}var n=function(e){return e&&e.Math==Math&&e},r=n("object"==typeof globalThis&&globalThis)||n("object"==typeof window&&window)||n("object"==typeof self&&self)||n("object"==typeof e&&e)||Function("return this")(),i=function(e){try{return!!e()}catch(e){return!0}},a=!i((function(){return 7!=Object.defineProperty({},1,{get:function(){return 7}})[1]})),o={}.propertyIsEnumerable,s=Object.getOwnPropertyDescriptor,l={f:s&&!o.call({1:2},1)?function(e){var t=s(this,e);return!!t&&t.enumerable}:o},c=function(e,t){return{enumerable:!(1&e),configurable:!(2&e),writable:!(4&e),value:t}},u={}.toString,f=function(e){return 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d(e){l(),e.offsetParent.scrollTop=e.offsetTop,c()}function p(e){l(),e.offsetParent.scrollTop=e.offsetTop-e.offsetParent.offsetHeight+e.offsetHeight,c()}function h(e){e.classList.add("selected"),f(e),r.sticky&&r.autoOpen&&E(e)}function m(e){if(b())switch(e.stopImmediatePropagation(),e.keyCode){case 72:case 37:!function(){var e=parseInt(O(".active-toolbar-button").getAttribute("data-button"))-1;e<0&&(e=T-1);S(null,O('.toolbar-panel-button[data-button="'+e+'"]').getAttribute("data-panel"))}();break;case 76:case 39:l=(parseInt(O(".active-toolbar-button").getAttribute("data-button"))+1)%T,S(null,O('.toolbar-panel-button[data-button="'+l+'"]').getAttribute("data-panel"));break;case 75:case 38:if(s=O(".active-menu-panel .slide-menu-items li.selected")||O(".active-menu-panel .slide-menu-items li.active"))A(".active-menu-panel .slide-menu-items li").forEach((function(e){e.classList.remove("selected")})),h(O('.active-menu-panel .slide-menu-items li[data-item="'+(parseInt(s.getAttribute("data-item"))-1)+'"]')||s);else(o=O(".active-menu-panel .slide-menu-items li.slide-menu-item"))&&h(o);break;case 74:case 40:if(s=O(".active-menu-panel .slide-menu-items li.selected")||O(".active-menu-panel .slide-menu-items li.active"))A(".active-menu-panel .slide-menu-items li").forEach((function(e){e.classList.remove("selected")})),h(O('.active-menu-panel .slide-menu-items li[data-item="'+(parseInt(s.getAttribute("data-item"))+1)+'"]')||s);else(o=O(".active-menu-panel .slide-menu-items li.slide-menu-item"))&&h(o);break;case 33:case 85:var t=A(".active-menu-panel .slide-menu-items li").filter((function(e){return u(e)>0})),n=A(".active-menu-panel .slide-menu-items li").filter((function(e){return 0==u(e)})),r=t.length>0&&Math.abs(u(t[t.length-1]))<t[t.length-1].clientHeight?t[t.length-1]:n[0];r&&(r.classList.contains("selected")&&t.length>0&&(p(r),r=(n=A(".active-menu-panel .slide-menu-items li").filter((function(e){return 0==u(e)})))[0]==r?t[t.length-1]:n[0]),A(".active-menu-panel .slide-menu-items li").forEach((function(e){e.classList.remove("selected")})),h(r),d(r));break;case 34:case 68:n=A(".active-menu-panel .slide-menu-items li").filter((function(e){return 0==u(e)}));var i=A(".active-menu-panel .slide-menu-items li").filter((function(e){return u(e)<0})),a=i.length>0&&Math.abs(u(i[0]))<i[0].clientHeight?i[0]:n[n.length-1];a&&(a.classList.contains("selected")&&i.length>0&&(d(a),a=(n=A(".active-menu-panel .slide-menu-items li").filter((function(e){return 0==u(e)})))[n.length-1]==a?i[0]:n[n.length-1]),A(".active-menu-panel .slide-menu-items li").forEach((function(e){e.classList.remove("selected")})),h(a),p(a));break;case 36:A(".active-menu-panel .slide-menu-items li").forEach((function(e){e.classList.remove("selected")})),(o=O(".active-menu-panel .slide-menu-items li:first-of-type"))&&(o.classList.add("selected"),f(o));break;case 35:var o;A(".active-menu-panel .slide-menu-items li").forEach((function(e){e.classList.remove("selected")})),(o=O(".active-menu-panel .slide-menu-items:last-of-type li:last-of-type"))&&(o.classList.add("selected"),f(o));break;case 32:case 13:var s;(s=O(".active-menu-panel .slide-menu-items li.selected"))&&E(s,!0);break;case 27:g(null,!0)}var l}function v(e){(e&&e.preventDefault(),b())||(O("body").classList.add("slide-menu-active"),O(".reveal").classList.add("has-"+r.effect+"-"+r.side),O(".slide-menu").classList.add("active"),O(".slide-menu-overlay").classList.add("active"),r.themes&&(A('div[data-panel="Themes"] li').forEach((function(e){e.classList.remove("active")})),A('li[data-theme="'+O("link#theme").getAttribute("href")+'"]').forEach((function(e){e.classList.add("active")}))),r.transitions&&(A('div[data-panel="Transitions"] li').forEach((function(e){e.classList.remove("active")})),A('li[data-transition="'+n.transition+'"]').forEach((function(e){e.classList.add("active")}))),A(".slide-menu-panel li.active").forEach((function(e){e.classList.add("selected"),f(e)})))}function g(e,t){e&&e.preventDefault(),r.sticky&&!t||(O("body").classList.remove("slide-menu-active"),O(".reveal").classList.remove("has-"+r.effect+"-"+r.side),O(".slide-menu").classList.remove("active"),O(".slide-menu-overlay").classList.remove("active"),A(".slide-menu-panel li.selected").forEach((function(e){e.classList.remove("selected")})))}function y(e){b()?g(e,!0):v(e)}function b(){return O("body").classList.contains("slide-menu-active")}function S(e,t){v(e);var n=t;"string"!=typeof t&&(n=e.currentTarget.getAttribute("data-panel")),O(".slide-menu-toolbar > li.active-toolbar-button").classList.remove("active-toolbar-button"),O('li[data-panel="'+n+'"]').classList.add("active-toolbar-button"),O(".slide-menu-panel.active-menu-panel").classList.remove("active-menu-panel"),O('div[data-panel="'+n+'"]').classList.add("active-menu-panel")}function E(e,n){var i=parseInt(e.getAttribute("data-slide-h")),a=parseInt(e.getAttribute("data-slide-v")),o=e.getAttribute("data-theme"),s=e.getAttribute("data-transition");if(isNaN(i)||isNaN(a))if(o){var l=O("link#theme"),c=l.parentElement,u=l.nextElementSibling;l.remove();var f=l.cloneNode();f.setAttribute("href",o),f.onload=function(){L()},c.insertBefore(f,u),g()}else if(s)t.configure({transition:s}),g();else{var d=O("a",e);d&&(n||!r.sticky||r.autoOpen&&d.href.startsWith("#")||d.href.startsWith(window.location.origin+window.location.pathname+"#"))&&d.click(),g()}else t.slide(i,a),g()}function x(e){"A"!==e.target.nodeName&&e.preventDefault(),E(e.currentTarget)}function w(){var e=t.getState();A("li.slide-menu-item, li.slide-menu-item-vertical").forEach((function(t){t.classList.remove("past"),t.classList.remove("active"),t.classList.remove("future");var n=parseInt(t.getAttribute("data-slide-h")),r=parseInt(t.getAttribute("data-slide-v"));n<e.indexh||n===e.indexh&&r<e.indexv?t.classList.add("past"):n===e.indexh&&r===e.indexv?t.classList.add("active"):t.classList.add("future")}))}function L(){var e=window.getComputedStyle(O(".reveal"));O(".slide-menu").style.fontFamily=e.fontFamily}var T=0;function C(){if(!a){var e=function(e,t,n,r,i,a){var o={"data-button":""+T++,class:"toolbar-panel-button"+(a?" active-toolbar-button":"")};t&&(o["data-panel"]=t);var s=k("li",o);return n.startsWith("fa-")?s.appendChild(k("i",{class:r+" "+n})):s.innerHTML=n+"</i>",s.appendChild(k("br"),O("i",s)),s.appendChild(k("span",{class:"slide-menu-toolbar-label"},e),O("i",s)),s.onclick=i,d.appendChild(s),s},i=function(e,i,a,o,s){function l(e,t){if(""===e)return null;var n=t?O(e,i):O(e);return n?n.textContent:null}var c=i.getAttribute("data-menu-title")||l(".menu-title",i)||l(r.titleSelector,i);if(!c&&r.useTextContentForMissingTitles&&(c=i.textContent.trim())&&(c=c.split("\n").map((function(e){return e.trim()})).join(" ").trim().replace(/^(.{16}[^\s]*).*/,"$1").replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/"/g,"&quot;").replace(/'/g,"&#039;")+"..."),!c){if(r.hideMissingTitles)return"";e+=" no-title",c="Slide "+(a+1)}var u=k("li",{class:e,"data-item":a,"data-slide-h":o,"data-slide-v":void 0===s?0:s});if(r.markers&&(u.appendChild(k("i",{class:"fas fa-check-circle fa-fw past"})),u.appendChild(k("i",{class:"fas fa-arrow-alt-circle-right fa-fw active"})),u.appendChild(k("i",{class:"far fa-circle fa-fw future"}))),r.numbers){var f=[],d="h.v";switch("string"==typeof r.numbers?d=r.numbers:"string"==typeof n.slideNumber&&(d=n.slideNumber),d){case"c":f.push(a+1);break;case"c/t":f.push(a+1,"/",t.getTotalSlides());break;case"h/v":f.push(o+1),"number"!=typeof s||isNaN(s)||f.push("/",s+1);break;default:f.push(o+1),"number"!=typeof s||isNaN(s)||f.push(".",s+1)}u.appendChild(k("span",{class:"slide-menu-item-number"},f.join("")+". "))}return u.appendChild(k("span",{class:"slide-menu-item-title"},c)),u},o=function(e){s&&(A(".active-menu-panel .slide-menu-items li.selected").forEach((function(e){e.classList.remove("selected")})),e.currentTarget.classList.add("selected"))},l=O(".reveal").parentElement,c=k("div",{class:"slide-menu-wrapper"});l.appendChild(c);var u=k("nav",{class:"slide-menu slide-menu--"+r.side});"string"==typeof r.width&&(-1!=["normal","wide","third","half","full"].indexOf(r.width)?u.classList.add("slide-menu--"+r.width):(u.classList.add("slide-menu--custom"),u.style.width=r.width)),c.appendChild(u),L();var f=k("div",{class:"slide-menu-overlay"});c.appendChild(f),f.onclick=function(){g(null,!0)};var d=k("ol",{class:"slide-menu-toolbar"});O(".slide-menu").appendChild(d),e("Slides","Slides","fa-images","fas",S,!0),r.custom&&r.custom.forEach((function(t,n,r){e(t.title,"Custom"+n,t.icon,null,S)})),r.themes&&e("Themes","Themes","fa-adjust","fas",S),r.transitions&&e("Transitions","Transitions","fa-sticky-note","fas",S);var p=k("li",{id:"close",class:"toolbar-panel-button"});if(p.appendChild(k("i",{class:"fas fa-times"})),p.appendChild(k("br")),p.appendChild(k("span",{class:"slide-menu-toolbar-label"},"Close")),p.onclick=function(){g(null,!0)},d.appendChild(p),function e(){if(document.querySelector("section[data-markdown]:not([data-markdown-parsed])"))setTimeout(e,100);else{var t=k("div",{"data-panel":"Slides",class:"slide-menu-panel active-menu-panel"});t.appendChild(k("ul",{class:"slide-menu-items"})),u.appendChild(t);var n=O('.slide-menu-panel[data-panel="Slides"] > .slide-menu-items'),r=0;A(".slides > section").forEach((function(e,t){var a=A("section",e);if(a.length>0)a.forEach((function(e,a){var o=i(0===a?"slide-menu-item":"slide-menu-item-vertical",e,r,t,a);o&&n.appendChild(o),r++}));else{var o=i("slide-menu-item",e,r,t);o&&n.appendChild(o),r++}})),A(".slide-menu-item, .slide-menu-item-vertical").forEach((function(e){e.onclick=x})),w()}}(),t.addEventListener("slidechanged",w),r.custom){var h=function(){this.status>=200&&this.status<300?(this.panel.innerHTML=this.responseText,C(this.panel)):I(this)},E=function(){I(this)},C=function(e){A("ul.slide-menu-items li.slide-menu-item",e).forEach((function(e,t){e.setAttribute("data-item",t+1),e.onclick=x,e.addEventListener("mouseenter",o)}))},I=function(e){var t="<p>ERROR: The attempt to fetch "+e.responseURL+" failed with HTTP status "+e.status+" ("+e.statusText+").</p><p>Remember that you need to serve the presentation HTML from a HTTP server.</p>";e.panel.innerHTML=t};r.custom.forEach((function(e,t,n){var r=k("div",{"data-panel":"Custom"+t,class:"slide-menu-panel slide-menu-custom-panel"});e.content?(r.innerHTML=e.content,C(r)):e.src&&function(e,t){var n=new XMLHttpRequest;n.panel=e,n.arguments=Array.prototype.slice.call(arguments,2),n.onload=h,n.onerror=E,n.open("get",t,!0),n.send(null)}(r,e.src),u.appendChild(r)}))}if(r.themes){var P=k("div",{class:"slide-menu-panel","data-panel":"Themes"});u.appendChild(P);var M=k("ul",{class:"slide-menu-items"});P.appendChild(M),r.themes.forEach((function(e,t){var n=k("li",{class:"slide-menu-item","data-theme":e.theme,"data-item":""+(t+1)},e.name);M.appendChild(n),n.onclick=x}))}if(r.transitions){P=k("div",{class:"slide-menu-panel","data-panel":"Transitions"});u.appendChild(P);M=k("ul",{class:"slide-menu-items"});P.appendChild(M),r.transitions.forEach((function(e,t){var n=k("li",{class:"slide-menu-item","data-transition":e.toLowerCase(),"data-item":""+(t+1)},e);M.appendChild(n),n.onclick=x}))}if(r.openButton){var N=k("div",{class:"slide-menu-button"}),R=k("a",{href:"#"});R.appendChild(k("i",{class:"fas fa-bars"})),N.appendChild(R),O(".reveal").appendChild(N),N.onclick=v}if(r.openSlideNumber)O("div.slide-number").onclick=v;A(".slide-menu-panel .slide-menu-items li").forEach((function(e){e.addEventListener("mouseenter",o)}))}if(r.keyboard){if(document.addEventListener("keydown",m,!1),window.addEventListener("message",(function(e){var t;try{t=JSON.parse(e.data)}catch(e){}t&&"triggerKey"===t.method&&m({keyCode:t.args[0],stopImmediatePropagation:function(){}})})),n.keyboardCondition&&"function"==typeof n.keyboardCondition){var j=n.keyboardCondition;n.keyboardCondition=function(e){return j(e)&&(!b()||77==e.keyCode)}}else n.keyboardCondition=function(e){return!b()||77==e.keyCode};t.addKeyBinding({keyCode:77,key:"M",description:"Toggle menu"},y)}r.openOnInit&&v(),a=!0}function O(e,t){return t||(t=document),t.querySelector(e)}function A(e,t){return t||(t=document),Array.prototype.slice.call(t.querySelectorAll(e))}function k(e,t,n){var r=document.createElement(e);return t&&Object.getOwnPropertyNames(t).forEach((function(e){r.setAttribute(e,t[e])})),n&&(r.innerHTML=n),r}function I(e,t,n){var r,i=document.querySelector("head");"script"===t?((r=document.createElement("script")).type="text/javascript",r.src=e):"stylesheet"===t&&((r=document.createElement("link")).rel="stylesheet",r.href=e);var a=function(){"function"==typeof n&&(n.call(),n=null)};r.onload=a,r.onreadystatechange=function(){"loaded"===this.readyState&&a()},i.appendChild(r)}function P(){var e,a,o,s=!i||i>=9;t.isSpeakerNotes()&&window.location.search.endsWith("controls=false")&&(s=!1),s&&(r.delayInit||C(),e="menu-ready",(o=document.createEvent("HTMLEvents",1,2)).initEvent(e,!0,!0),function(e,t){for(var n in t)e[n]=t[n]}(o,a),document.querySelector(".reveal").dispatchEvent(o),n.postMessageEvents&&window.parent!==window.self&&window.parent.postMessage(JSON.stringify({namespace:"reveal",eventName:e,state:t.getState()}),"*"))}return{id:"menu",init:function(e){o(n=(t=e).getConfig()),I(r.path+"menu.css","stylesheet",(function(){void 0===r.loadIcons||r.loadIcons?I(r.path+"font-awesome/css/all.css","stylesheet",P):P()}))},toggle:y,openMenu:v,closeMenu:g,openPanel:S,isOpen:b,initialiseMenu:C,isMenuInitialised:function(){return a}}}
diff --git a/menu.js b/menu.js
index 908b513..ce5cbbb 100644
--- a/menu.js
+++ b/menu.js
@@ -1,955 +1 @@
-/*
- * Reveal.js menu plugin
- * MIT licensed
- * (c) Greg Denehy 2015
- */
-
-var RevealMenu = window.RevealMenu || (function(){
-	// polyfill
-	if (!String.prototype.startsWith) {
-		String.prototype.startsWith = function(searchString, position){
-		  return this.substr(position || 0, searchString.length) === searchString;
-	  };
-	}
-	if (!String.prototype.endsWith) {
-		String.prototype.endsWith = function(search, this_len) {
-			if (this_len === undefined || this_len > this.length) {
-				this_len = this.length;
-			}
-			return this.substring(this_len - search.length, this_len) === search;
-		};
-	}
-
-	var ieVersion = function() {
-		var browser = /(msie) ([\w.]+)/.exec(window.navigator.userAgent.toLowerCase());
-		if (browser && browser[1] === "msie") {
-			return parseFloat(browser[2]);
-		}
-		return null;
-	}();
-	
-	var config = Reveal.getConfig();
-	var options = config.menu || {};
-	options.path = options.path || scriptPath() || 'plugin/menu/';
-	if (!options.path.endsWith('/')) {
-		options.path += '/';
-	}
-	var loadIcons = options.loadIcons;
-	if (typeof loadIcons === "undefined") loadIcons = true;
-	var initialised = false;
-	
-	var module = {};
-
-	loadResource(options.path + 'menu.css', 'stylesheet', function() {
-		if (loadIcons) {
-			loadResource(options.path + 'font-awesome/css/all.css', 'stylesheet', loadPlugin)
-		} else {
-			loadPlugin();
-		}
-	})
-
-	function loadPlugin() {
-		// does not support IE8 or below
-		var initialise = !ieVersion || ieVersion >= 9;
-
-		// do not load the menu in the upcoming slide panel in the speaker notes
-		if (Reveal.isSpeakerNotes() && window.location.search.endsWith('controls=false')) {
-			initialise = false;
-		}
-
-		if (initialise) {
-			//
-			// Set option defaults
-			//
-			var side = options.side || 'left';	// 'left' or 'right'
-			var width = options.width;
-			var numbers = options.numbers || false;
-			var titleSelector = 'h1, h2, h3, h4, h5';
-			if (typeof options.titleSelector === 'string') titleSelector = options.titleSelector;
-			var hideMissingTitles = options.hideMissingTitles || false;
-			var useTextContentForMissingTitles = options.useTextContentForMissingTitles || false;
-			var markers = options.markers;
-			if (typeof markers === "undefined") markers = true;
-			var custom = options.custom;
-			var themesPath = typeof options.themesPath === 'string' ? options.themesPath : 'css/theme/';
-			if (!themesPath.endsWith('/')) themesPath += '/';
-			var themes = select('link#theme') ? options.themes : false;
-			if (themes === true) {
-				themes = [
-					{ name: 'Black', theme: themesPath + 'black.css' },
-					{ name: 'White', theme: themesPath + 'white.css' },
-					{ name: 'League', theme: themesPath + 'league.css' },
-					{ name: 'Sky', theme: themesPath + 'sky.css' },
-					{ name: 'Beige', theme: themesPath + 'beige.css' },
-					{ name: 'Simple', theme: themesPath + 'simple.css' },
-					{ name: 'Serif', theme: themesPath + 'serif.css' },
-					{ name: 'Blood', theme: themesPath + 'blood.css' },
-					{ name: 'Night', theme: themesPath + 'night.css' },
-					{ name: 'Moon', theme: themesPath + 'moon.css' },
-					{ name: 'Solarized', theme: themesPath + 'solarized.css' }
-				];
-			} else if (!Array.isArray(themes)) {
-				themes = false;
-			}
-			var transitions = options.transitions || false;
-			if (transitions === true) {
-				transitions = ['None', 'Fade', 'Slide', 'Convex', 'Concave', 'Zoom'];
-			} else if (transitions !== false && (!Array.isArray(transitions) || !transitions.every(function(e) { return typeof e === "string" }))) {
-				console.error("reveal.js-menu error: transitions config value must be 'true' or an array of strings, eg ['None', 'Fade', 'Slide')");
-				transitions = false;
-			}
-			if (ieVersion && ieVersion <= 9) {
-				// transitions aren't support in IE9 anyway, so no point in showing them
-				transitions = false;
-			}
-			var openButton = options.openButton;
-			if (typeof openButton === "undefined") openButton = true;
-			var openSlideNumber = options.openSlideNumber;
-			if (typeof openSlideNumber === "undefined") openSlideNumber = false;
-			var keyboard = options.keyboard;
-			if (typeof keyboard === "undefined") keyboard = true;
-			var sticky = options.sticky;
-			if (typeof sticky === "undefined") sticky = false;
-			var autoOpen = options.autoOpen;
-			if (typeof autoOpen === "undefined") autoOpen = true;
-			var delayInit = options.delayInit;
-			if (typeof delayInit === "undefined") delayInit = false;
-			var openOnInit = options.openOnInit || false;
-			
-			var mouseSelectionEnabled = true;
-			function disableMouseSelection() {
-				mouseSelectionEnabled = false;
-			}
-
-			function reenableMouseSelection() {
-				// wait until the mouse has moved before re-enabling mouse selection
-				// to avoid selections on scroll
-				select('nav.slide-menu').addEventListener('mousemove', function fn(e) {
-					select('nav.slide-menu').removeEventListener('mousemove', fn);
-					//XXX this should select the item under the mouse
-					mouseSelectionEnabled = true;
-				});
-			}
-
-			//
-			// Keyboard handling
-			//
-			function getOffset(el) {
-				var _x = 0;
-				var _y = 0;
-				while(el && !isNaN(el.offsetLeft) && !isNaN(el.offsetTop)) {
-					_x += el.offsetLeft - el.scrollLeft;
-					_y += el.offsetTop - el.scrollTop;
-					el = el.offsetParent;
-				}
-				return { top: _y, left: _x };
-			}
-
-			function visibleOffset(el) {
-				var offsetFromTop = getOffset(el).top - el.offsetParent.offsetTop;
-				if (offsetFromTop < 0) return -offsetFromTop
-				var offsetFromBottom = el.offsetParent.offsetHeight - (el.offsetTop - el.offsetParent.scrollTop + el.offsetHeight);
-				if (offsetFromBottom < 0) return offsetFromBottom; 
-				return 0;
-			}
-
-			function keepVisible(el) {
-				var offset = visibleOffset(el);
-				if (offset) {
-					disableMouseSelection();
-					el.scrollIntoView(offset > 0);
-					reenableMouseSelection();
-				}
-			}
-
-			function scrollItemToTop(el) {
-				disableMouseSelection();
-				el.offsetParent.scrollTop = el.offsetTop;
-				reenableMouseSelection();
-			}
-
-			function scrollItemToBottom(el) {
-				disableMouseSelection();
-				el.offsetParent.scrollTop = el.offsetTop - el.offsetParent.offsetHeight + el.offsetHeight
-				reenableMouseSelection();
-			}
-
-			function selectItem(el) {
-				el.classList.add('selected');
-				keepVisible(el);
-				if (sticky && autoOpen) openItem(el);
-			}
-
-			function onDocumentKeyDown(event) {
-				// opening menu is handled by registering key binding with Reveal below
-				if (isOpen()) {
-					event.stopImmediatePropagation();
-					switch( event.keyCode ) {
-						// case 77:
-						// 	closeMenu();
-						// 	break;
-						// h, left - change panel
-						case 72: case 37:
-							prevPanel();
-							break;
-						// l, right - change panel
-						case 76: case 39:
-							nextPanel();
-							break;
-						// k, up
-						case 75: case 38:
-							var currItem = select('.active-menu-panel .slide-menu-items li.selected') || select('.active-menu-panel .slide-menu-items li.active');
-							if (currItem) {
-								selectAll('.active-menu-panel .slide-menu-items li').forEach(function(item) { item.classList.remove('selected') });
-								var nextItem = select('.active-menu-panel .slide-menu-items li[data-item="' + (parseInt(currItem.getAttribute('data-item')) - 1) + '"]') || currItem;
-								selectItem(nextItem);
-							} else {
-								var item = select('.active-menu-panel .slide-menu-items li.slide-menu-item');
-								if (item) selectItem(item);
-							}
-							break;
-						// j, down
-						case 74: case 40:
-							var currItem = select('.active-menu-panel .slide-menu-items li.selected') || select('.active-menu-panel .slide-menu-items li.active');
-							if (currItem) {
-								selectAll('.active-menu-panel .slide-menu-items li').forEach(function(item) { item.classList.remove('selected') });
-								var nextItem = select('.active-menu-panel .slide-menu-items li[data-item="' + (parseInt(currItem.getAttribute('data-item')) + 1) + '"]') || currItem;
-								selectItem(nextItem);
-							} else {
-								var item = select('.active-menu-panel .slide-menu-items li.slide-menu-item');
-								if (item) selectItem(item);
-							}
-							break;
-						// pageup, u
-						case 33: case 85:
-							var itemsAbove = selectAll('.active-menu-panel .slide-menu-items li').filter(function(item) { return visibleOffset(item) > 0; });
-							var visibleItems = selectAll('.active-menu-panel .slide-menu-items li').filter(function(item) { return visibleOffset(item) == 0; });
-
-							var firstVisible = (itemsAbove.length > 0 && Math.abs(visibleOffset(itemsAbove[itemsAbove.length-1])) < itemsAbove[itemsAbove.length-1].clientHeight ? itemsAbove[itemsAbove.length-1] : visibleItems[0]);
-							if (firstVisible) {
-								if (firstVisible.classList.contains('selected') && itemsAbove.length > 0) {
-									// at top of viewport already, page scroll (if not at start)
-									// ...move selected item to bottom, and change selection to last fully visible item at top
-									scrollItemToBottom(firstVisible);
-									visibleItems = selectAll('.active-menu-panel .slide-menu-items li').filter(function(item) { return visibleOffset(item) == 0; });
-									if (visibleItems[0] == firstVisible) {
-										// prev item is still beyond the viewport (for custom panels)
-										firstVisible = itemsAbove[itemsAbove.length-1];
-									} else {
-										firstVisible = visibleItems[0];
-									}
-								}
-								selectAll('.active-menu-panel .slide-menu-items li').forEach(function(item) { item.classList.remove('selected') });
-								selectItem(firstVisible);
-								// ensure selected item is positioned at the top of the viewport
-								scrollItemToTop(firstVisible);
-							}
-							break;
-						// pagedown, d
-						case 34: case 68:
-							var visibleItems = selectAll('.active-menu-panel .slide-menu-items li').filter(function(item) { return visibleOffset(item) == 0; });
-							var itemsBelow = selectAll('.active-menu-panel .slide-menu-items li').filter(function(item) { return visibleOffset(item) < 0; });
-							
-							var lastVisible = (itemsBelow.length > 0 && Math.abs(visibleOffset(itemsBelow[0])) < itemsBelow[0].clientHeight ? itemsBelow[0] : visibleItems[visibleItems.length-1]);
-							if (lastVisible) {
-								if (lastVisible.classList.contains('selected') && itemsBelow.length > 0) {
-									// at bottom of viewport already, page scroll (if not at end)
-									// ...move selected item to top, and change selection to last fully visible item at bottom
-									scrollItemToTop(lastVisible);
-									visibleItems = selectAll('.active-menu-panel .slide-menu-items li').filter(function(item) { return visibleOffset(item) == 0; });
-									if (visibleItems[visibleItems.length-1] == lastVisible) {
-										// next item is still beyond the viewport (for custom panels)
-										lastVisible = itemsBelow[0];
-									} else {
-										lastVisible = visibleItems[visibleItems.length-1];
-									}
-								}
-								selectAll('.active-menu-panel .slide-menu-items li').forEach(function(item) { item.classList.remove('selected') });
-								selectItem(lastVisible);
-								// ensure selected item is positioned at the bottom of the viewport
-								scrollItemToBottom(lastVisible);
-							}
-							break;
-						// home
-						case 36:
-							selectAll('.active-menu-panel .slide-menu-items li').forEach(function(item) { item.classList.remove('selected') });
-							var item = select('.active-menu-panel .slide-menu-items li:first-of-type');
-							if (item) {
-								item.classList.add('selected');
-								keepVisible(item);
-							}
-							break;
-						// end
-						case 35:
-							selectAll('.active-menu-panel .slide-menu-items li').forEach(function(item) { item.classList.remove('selected') });
-							var item = select('.active-menu-panel .slide-menu-items:last-of-type li:last-of-type');
-							if (item) {
-								item.classList.add('selected');
-								keepVisible(item);
-							}
-							break;
-						// space, return
-						case 32: case 13:
-							var currItem = select('.active-menu-panel .slide-menu-items li.selected');
-							if (currItem) {
-								openItem(currItem, true);
-							}
-							break;
-						// esc
-						case 27: closeMenu(null, true); break;
-					}
-				}
-			}
-
-			if (keyboard) {
-				//XXX add keyboard option for custom key codes, etc.
-
-				document.addEventListener('keydown', onDocumentKeyDown, false);
-
-				// handle key presses within speaker notes
-				window.addEventListener( 'message', function( event ) {
-					var data;
-					try {
-						data = JSON.parse( event.data );
-					} catch (e) {
-					}
-					if (data && data.method === 'triggerKey') {
-						onDocumentKeyDown( { keyCode: data.args[0], stopImmediatePropagation: function() {} } );
-					}
-				});
-
-				// Prevent reveal from processing keyboard events when the menu is open
-				if (config.keyboardCondition && typeof config.keyboardCondition === 'function') {
-					// combine user defined keyboard condition with the menu's own condition
-					var userCondition = config.keyboardCondition;
-					config.keyboardCondition = function(event) {
-						return userCondition(event) && (!isOpen() || event.keyCode == 77);
-					};
-				} else {
-					config.keyboardCondition = function(event) {
-						return !isOpen() || event.keyCode == 77;
-					}
-				}
-			}
-
-
-			//
-			// Utilty functions
-			//
-
-			function openMenu(event) {
-				if (event) event.preventDefault();
-				if (!isOpen()) {
-					select('body').classList.add('slide-menu-active');
-				    select('.reveal').classList.add('has-' + options.effect + '-' + side);
-				    select('.slide-menu').classList.add('active');
-				    select('.slide-menu-overlay').classList.add('active');
-					
-					// identify active theme
-					if (themes) {
-						selectAll('div[data-panel="Themes"] li').forEach(function(i) { i.classList.remove('active') });
-						selectAll('li[data-theme="' + select('link#theme').getAttribute('href') + '"]').forEach(function(i) { i.classList.add('active') });
-					}
-					
-					// identify active transition
-					if (transitions) {
-						selectAll('div[data-panel="Transitions"] li').forEach(function(i) { i.classList.remove('active') });
-						selectAll('li[data-transition="' + Reveal.getConfig().transition + '"]').forEach(function(i) { i.classList.add('active') });
-					}
-
-				    // set item selections to match active items
-					var items = selectAll('.slide-menu-panel li.active')
-					items.forEach(function(i) {
-						i.classList.add('selected');
-						keepVisible(i);
-					});
-				}
-			}
-
-			function closeMenu(event, force) {
-				if (event) event.preventDefault();
-				if (!sticky || force) {
-					select('body').classList.remove('slide-menu-active');
-					select('.reveal').classList.remove('has-' + options.effect + '-' + side);
-					select('.slide-menu').classList.remove('active');
-					select('.slide-menu-overlay').classList.remove('active');
-					selectAll('.slide-menu-panel li.selected').forEach(function(i) { i.classList.remove('selected') });
-				}
-			}
-
-			function toggleMenu(event) {
-				if (isOpen()) {
-					closeMenu(event, true);
-				} else {
-					openMenu(event);
-				}
-			}
-
-			function isOpen() {
-				return select('body').classList.contains('slide-menu-active');
-			}
-
-			function openPanel(event, ref) {
-				openMenu(event);
-				var panel = ref;
-				if (typeof ref !== "string") {
-					panel = event.currentTarget.getAttribute('data-panel');
-				}
-				select('.slide-menu-toolbar > li.active-toolbar-button').classList.remove('active-toolbar-button');
-				select('li[data-panel="' + panel + '"]').classList.add('active-toolbar-button');
-				select('.slide-menu-panel.active-menu-panel').classList.remove('active-menu-panel');
-				select('div[data-panel="' + panel + '"]').classList.add('active-menu-panel');
-			}
-
-			function nextPanel() {
-				var next = (parseInt(select('.active-toolbar-button').getAttribute('data-button')) + 1) % buttons;
-				openPanel(null, select('.toolbar-panel-button[data-button="' + next + '"]').getAttribute('data-panel'));
-			}
-
-			function prevPanel() {
-				var next = parseInt(select('.active-toolbar-button').getAttribute('data-button')) - 1;
-				if (next < 0) {
-					next = buttons - 1;
-				}
-				openPanel(null, select('.toolbar-panel-button[data-button="' + next + '"]').getAttribute('data-panel'));
-			}
-
-			function openItem(item, force) {
-				var h = parseInt(item.getAttribute('data-slide-h'));
-				var v = parseInt(item.getAttribute('data-slide-v'));
-				var theme = item.getAttribute('data-theme');
-				var transition = item.getAttribute('data-transition');
-				if (!isNaN(h) && !isNaN(v)) {
-					Reveal.slide(h, v);
-					closeMenu();
-				} else if (theme) {
-					// take note of the previous theme and remove it, then create a new stylesheet reference and insert it
-					// this is required to force a load event so we can change the menu style to match the new style
-					var stylesheet = select('link#theme');
-					var parent = stylesheet.parentElement;
-					var sibling = stylesheet.nextElementSibling;
-					stylesheet.remove();
-
-					var newStylesheet = stylesheet.cloneNode();
-					newStylesheet.setAttribute('href', theme);
-					newStylesheet.onload = function() { matchRevealStyle() };
-					parent.insertBefore(newStylesheet, sibling);
-
-					closeMenu();
-				} else if (transition) {
-					Reveal.configure({ transition: transition });
-					closeMenu();
-				} else {
-					var link = select('a', item);
-					if (link) {
-						if (force || !sticky || (autoOpen && link.href.startsWith('#') || link.href.startsWith(window.location.origin + window.location.pathname + '#'))) {
-							link.click();
-						}
-					}
-					closeMenu();
-				}
-			}
-
-			function clicked(event) {
-				if (event.target.nodeName !== "A") {
-					event.preventDefault();
-				}
-				openItem(event.currentTarget);
-			}
-
-			function highlightCurrentSlide() {
-				var state = Reveal.getState();
-				selectAll('li.slide-menu-item, li.slide-menu-item-vertical').forEach(function(item) {
-					item.classList.remove('past');
-					item.classList.remove('active');
-					item.classList.remove('future');
-
-					var h = parseInt(item.getAttribute('data-slide-h'));
-					var v = parseInt(item.getAttribute('data-slide-v'));
-					if (h < state.indexh || (h === state.indexh && v < state.indexv)) {
-						item.classList.add('past');
-					}
-					else if (h === state.indexh && v === state.indexv) {
-						item.classList.add('active');
-					}
-					else {
-						item.classList.add('future');
-					}
-				});
-			}
-
-			function matchRevealStyle() {
-				var revealStyle = window.getComputedStyle(select('.reveal'));
-				var element = select('.slide-menu');
-				element.style.fontFamily = revealStyle.fontFamily;
-				//XXX could adjust the complete menu style to match the theme, ie colors, etc
-			}
-
-			var buttons = 0;
-			function init() {
-				if (!initialised) {
-					var parent = select('.reveal').parentElement;
-					var top = create('div', { 'class': 'slide-menu-wrapper'});
-					parent.appendChild(top);
-					var panels = create('nav', { 'class': 'slide-menu slide-menu--' + side});
-					if (typeof width === 'string') {
-						if (['normal', 'wide', 'third', 'half', 'full'].indexOf(width) != -1) {
-							panels.classList.add('slide-menu--' + width);
-						}
-						else {
-							panels.classList.add('slide-menu--custom');
-							panels.style.width = width;
-						}
-					}
-					top.appendChild(panels);
-					matchRevealStyle();
-					var overlay = create('div', { 'class': 'slide-menu-overlay'});
-					top.appendChild(overlay);
-					overlay.onclick = function() { closeMenu(null, true) };
-
-					var toolbar = create('ol', {'class': 'slide-menu-toolbar'});
-					select('.slide-menu').appendChild(toolbar);
-
-					function addToolbarButton(title, ref, icon, style, fn, active) {
-						var attrs = {
-							'data-button': '' + (buttons++),
-							'class': 'toolbar-panel-button' + (active ? ' active-toolbar-button' : '')
-						};
-						if (ref) {
-							attrs['data-panel'] = ref;
-						}	
-						var button = create('li', attrs);
-
-						if (icon.startsWith('fa-')) {
-							button.appendChild(create('i', {'class': style + ' ' + icon}));
-						} else {
-							button.innerHTML = icon + '</i>';
-						}
-						button.appendChild(create('br'), select('i', button));
-						button.appendChild(create('span', {'class': 'slide-menu-toolbar-label'}, title), select('i', button));
-						button.onclick = fn;
-						toolbar.appendChild(button);
-						return button;
-					}
-
-					addToolbarButton('Slides', 'Slides', 'fa-images', 'fas', openPanel, true);
-
-					if (custom) {
-						custom.forEach(function(element, index, array) {
-							addToolbarButton(element.title, 'Custom' + index, element.icon, null, openPanel);
-						});
-					}
-
-					if (themes) {
-						addToolbarButton('Themes', 'Themes', 'fa-adjust', 'fas', openPanel);
-					}
-					if (transitions) {
-						addToolbarButton('Transitions', 'Transitions', 'fa-sticky-note', 'fas', openPanel);
-					}
-					button = create('li', {id: 'close', 'class': 'toolbar-panel-button'});
-					button.appendChild(create('i', {'class': 'fas fa-times'}));
-					button.appendChild(create('br'));
-					button.appendChild(create('span', {'class': 'slide-menu-toolbar-label'}, 'Close'));
-					button.onclick = function() { closeMenu(null, true) };
-					toolbar.appendChild(button);
-
-					//
-					// Slide links
-					//
-					function generateItem(type, section, i, h, v) {
-						var link = '/#/' + h;
-						if (typeof v === 'number' && !isNaN( v )) link += '/' + v;
-
-						function text(selector, parent) {
-							var el = (parent ? select(selector, section) : select(selector));
-							if (el) return el.textContent;
-							return null;
-						}
-						var title = section.getAttribute('data-menu-title') ||
-							text('.menu-title', section) ||
-							text(titleSelector, section);
-
-						if (!title && useTextContentForMissingTitles) {
-							// attempt to figure out a title based on the text in the slide
-							title = section.textContent.trim();
-							if (title) {
-								title = title.split('\n')
-									.map(function(t) { return t.trim() }).join(' ').trim()
-									.replace(/^(.{16}[^\s]*).*/, "$1") // limit to 16 chars plus any consecutive non-whitespace chars (to avoid breaking words)
-									.replace(/&/g, "&amp;")
-									.replace(/</g, "&lt;")
-									.replace(/>/g, "&gt;")
-									.replace(/"/g, "&quot;")
-									.replace(/'/g, "&#039;") + '...';
-							}
-						}
-
-						if (!title) {
-							if (hideMissingTitles) return '';
-							type += ' no-title';
-							title = "Slide " + i;
-						}
-
-						var item = create('li', {
-							class: type,
-							'data-item': i,
-							'data-slide-h': h,
-							'data-slide-v': (v === undefined ? 0 : v)
-						});
-
-						if (markers) {
-							item.appendChild(create('i', {class: 'fas fa-check-circle fa-fw past'}));
-							item.appendChild(create('i', {class: 'fas fa-arrow-alt-circle-right fa-fw active'}));
-							item.appendChild(create('i', {class: 'far fa-circle fa-fw future'}));
-						}
-
-						if (numbers) {
-							// Number formatting taken from reveal.js
-							var value = [];
-							var format = 'h.v';
-
-							// Check if a custom number format is available
-							if( typeof numbers === 'string' ) {
-								format = numbers;
-							}
-							else if (typeof config.slideNumber === 'string') {
-								// Take user defined number format for slides
-								format = config.slideNumber;
-							}
-
-							switch( format ) {
-								case 'c':
-									value.push( i );
-									break;
-								case 'c/t':
-									value.push( i, '/', Reveal.getTotalSlides() );
-									break;
-								case 'h/v':
-									value.push( h + 1 );
-									if( typeof v === 'number' && !isNaN( v ) ) value.push( '/', v + 1 );
-									break;
-								default:
-									value.push( h + 1 );
-									if( typeof v === 'number' && !isNaN( v ) ) value.push( '.', v + 1 );
-							}
-
-							item.appendChild(create('span', {class: 'slide-menu-item-number'}, value.join('') + '. '));
-						}
-
-						item.appendChild(create('span', {class: 'slide-menu-item-title'}, title));
-						
-						return item;
-					}
-
-					function createSlideMenu() {
-						if ( !document.querySelector('section[data-markdown]:not([data-markdown-parsed])') ) {
-							var panel = create('div', {
-								'data-panel': 'Slides',
-								'class': 'slide-menu-panel active-menu-panel'
-							});
-							panel.appendChild(create('ul', {class: "slide-menu-items"}));
-							panels.appendChild(panel);
-							var items = select('.slide-menu-panel[data-panel="Slides"] > .slide-menu-items');
-							var slideCount = 0;
-							selectAll('.slides > section').forEach(function(section, h) {
-								var subsections = selectAll('section', section);
-								if (subsections.length > 0) {
-									subsections.forEach(function(subsection, v) {
-										var type = (v === 0 ? 'slide-menu-item' : 'slide-menu-item-vertical');
-										var item = generateItem(type, subsection, slideCount, h, v);
-										if (item) {
-											slideCount++;
-											items.appendChild(item);
-										}
-									});
-								} else {
-									var item = generateItem('slide-menu-item', section, slideCount, h);
-									if (item) {
-										slideCount++;
-										items.appendChild(item);
-									}
-								}
-							});
-							selectAll('.slide-menu-item, .slide-menu-item-vertical').forEach(function(i) {
-								i.onclick = clicked;
-							});
-							highlightCurrentSlide();
-						}
-						else {
-						// wait for markdown to be loaded and parsed
-							setTimeout( createSlideMenu, 100 );
-						}
-					}
-
-					createSlideMenu();
-					Reveal.addEventListener('slidechanged', highlightCurrentSlide);
-
-					//
-					// Custom menu panels
-					//
-					if (custom) {
-						function xhrSuccess () {
-							if (this.status >= 200 && this.status < 300) {
-								this.panel.innerHTML = this.responseText;
-								enableCustomLinks(this.panel);
-							}
-							else {
-								showErrorMsg(this)
-							}
-						}
-						function xhrError () {
-							showErrorMsg(this)
-						}
-						function loadCustomPanelContent (panel, sURL) {
-							var oReq = new XMLHttpRequest();
-							oReq.panel = panel;
-							oReq.arguments = Array.prototype.slice.call(arguments, 2);
-							oReq.onload = xhrSuccess;
-							oReq.onerror = xhrError;
-							oReq.open("get", sURL, true);
-							oReq.send(null);
-						}
-						function enableCustomLinks(panel) {
-							selectAll('ul.slide-menu-items li.slide-menu-item', panel).forEach(function(item, i) {
-								item.setAttribute('data-item', i+1);
-								item.onclick = clicked;
-								item.addEventListener("mouseenter", handleMouseHighlight);
-							});
-						}
-
-						function showErrorMsg(response) {
-							var msg = '<p>ERROR: The attempt to fetch ' + response.responseURL + ' failed with HTTP status ' + 
-								response.status + ' (' + response.statusText + ').</p>' +
-								'<p>Remember that you need to serve the presentation HTML from a HTTP server.</p>';
-								response.panel.innerHTML = msg;
-						}
-
-						custom.forEach(function(element, index, array) {
-							var panel = create('div', {
-								'data-panel': 'Custom' + index,
-								class: 'slide-menu-panel slide-menu-custom-panel'
-							});
-							if (element.content) {
-								panel.innerHTML = element.content;
-								enableCustomLinks(panel);
-							}
-							else if (element.src) {
-								loadCustomPanelContent(panel, element.src);
-							}
-							panels.appendChild(panel);
-						})
-					}
-
-					//
-					// Themes
-					//
-					if (themes) {
-						var panel = create('div', {
-							class: 'slide-menu-panel',
-							'data-panel': 'Themes'
-						});
-						panels.appendChild(panel);
-						var menu = create('ul', {class: 'slide-menu-items'});
-						panel.appendChild(menu);
-						themes.forEach(function(t, i) {
-							var item = create('li', {
-								class: 'slide-menu-item',
-								'data-theme': t.theme,
-								'data-item': ''+(i+1)
-							 }, t.name);
-							 menu.appendChild(item);
-							 item.onclick = clicked;
-						})
-					}
-
-					//
-					// Transitions
-					//
-					if (transitions) {
-						var panel = create('div', {
-							class: 'slide-menu-panel',
-							'data-panel': 'Transitions'
-						});
-						panels.appendChild(panel);
-						var menu = create('ul', {class: 'slide-menu-items'});
-						panel.appendChild(menu);
-						transitions.forEach(function(name, i) {
-							var item = create('li', {
-								class: 'slide-menu-item',
-								'data-transition': name.toLowerCase(),
-								'data-item': ''+(i+1)
-							}, name);
-							menu.appendChild(item);
-							item.onclick = clicked;
-						})
-					}
-
-					//
-					// Open menu options
-					//
-					if (openButton) {
-						// add menu button
-						var div = create('div', {class: 'slide-menu-button'});
-						var link = create('a', {href: '#'});
-						link.appendChild(create('i', {class: 'fas fa-bars'}));
-						div.appendChild(link);
-						select('.reveal').appendChild(div);
-						div.onclick = openMenu;
-					}
-
-					if (openSlideNumber) {
-						// wrap slide number in link
-						var slideNumber = select('div.slide-number');
-						var wrapper = create('div', {class: 'slide-number-wrapper'});
-						var link = create('a', {href: '#'});
-						wrapper.appendChild(link);
-						slideNumber.parentElement.insertBefore(wrapper, slideNumber);
-						link.appendChild(slideNumber);
-						link.onclick = openMenu;
-					}
-
-					//
-					// Handle mouse overs
-					//
-					selectAll('.slide-menu-panel .slide-menu-items li').forEach(function(item) {
-						item.addEventListener("mouseenter", handleMouseHighlight);
-					});
-
-					function handleMouseHighlight(event) {
-						if (mouseSelectionEnabled) {
-							selectAll('.active-menu-panel .slide-menu-items li.selected').forEach(function(i) {
-								i.classList.remove('selected');
-							});
-							event.currentTarget.classList.add('selected');
-						}
-					}
-				}
-				if (openOnInit) {
-					openMenu();
-				}
-				initialised = true;
-			}
-
-			module.toggle = toggleMenu;
-			module.openMenu = openMenu;
-			module.closeMenu = closeMenu;
-			module.openPanel = openPanel;
-			module.isOpen = isOpen;
-			module.init = init;
-			module.isInit = function() { return initialised };
-			
-			if (!delayInit) {
-				init();
-			}
-
-			/**
-			 * Extend object a with the properties of object b.
-			 * If there's a conflict, object b takes precedence.
-			 */
-			function extend( a, b ) {
-				for( var i in b ) {
-					a[ i ] = b[ i ];
-				}
-			}
-
-			/**
-			 * Dispatches an event of the specified type from the
-			 * reveal DOM element.
-			 */
-			function dispatchEvent( type, args ) {
-				var event = document.createEvent( 'HTMLEvents', 1, 2 );
-				event.initEvent( type, true, true );
-				extend( event, args );
-				document.querySelector('.reveal').dispatchEvent( event );
-
-				// If we're in an iframe, post each reveal.js event to the
-				// parent window. Used by the notes plugin
-				if( config.postMessageEvents && window.parent !== window.self ) {
-					window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: Reveal.getState() }), '*' );
-				}
-			}
-
-			Reveal.addKeyBinding({keyCode: 77, key: 'M', description: 'Toggle menu'}, toggleMenu);
-
-			dispatchEvent('menu-ready');
-		}
-	}
-
-	function select(selector, el) {
-		if (!el) {
-			el = document;
-		}
-		return el.querySelector(selector);
-	}
-
-	function selectAll(selector, el) {
-		if (!el) {
-			el = document;
-		}
-		return Array.prototype.slice.call(el.querySelectorAll(selector));
-	}
-
-	function create(tagName, attrs, content) {
-		var el = document.createElement(tagName);
-		if (attrs) {
-			Object.getOwnPropertyNames(attrs).forEach(function(n) {
-				el.setAttribute(n, attrs[n]);
-			});
-		}
-		if (content) el.innerHTML = content;
-		return el;
-	}
-
-	// modified from math plugin
-	function loadResource( url, type, callback ) {
-		var head = document.querySelector( 'head' );
-		var resource;
-
-		if ( type === 'script' ) {
-			resource = document.createElement( 'script' );
-			resource.type = 'text/javascript';
-			resource.src = url;
-		}
-		else if ( type === 'stylesheet' ) {
-			resource = document.createElement( 'link' );
-			resource.rel = 'stylesheet';
-			resource.href = url;
-		}
-
-		// Wrapper for callback to make sure it only fires once
-		var finish = function() {
-			if( typeof callback === 'function' ) {
-				callback.call();
-				callback = null;
-			}
-		}
-
-		resource.onload = finish;
-
-		// IE
-		resource.onreadystatechange = function() {
-			if ( this.readyState === 'loaded' ) {
-				finish();
-			}
-		}
-
-		// Normal browsers
-		head.appendChild( resource );
-	}
-
-	function scriptPath() {
-		// obtain plugin path from the script element
-		var path;
-		if (document.currentScript) {
-			path = document.currentScript.src.slice(0, -7);
-		} else {
-			var sel = document.querySelector('script[src$="menu.js"]');
-			if (sel) {
-				path = sel.src.slice(0, -7);
-			}
-		}
-		return path;
-	}
-
-	return module;
-})();
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diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..0115a86
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,4506 @@
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+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "dev": true
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-7.1.1.tgz",
+      "integrity": "sha512-huO4Fr1f9PmiJJdll5kwoS2e4GqzGSsMT3PPMpOwoVkOK8ckqAewMTZyA6LXVQWflleb/Z8oPBEvNsMft0XE+g==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^3.0.0",
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.2",
+        "which-module": "^1.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "5.0.0-security.0"
+      }
+    },
+    "yargs-parser": {
+      "version": "5.0.0-security.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0-security.0.tgz",
+      "integrity": "sha512-T69y4Ps64LNesYxeYGYPvfoMTt/7y1XtfpIslUeK4um+9Hu7hlGoRtaDLvdXb7+/tfq4opVa2HRY5xGip022rQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^3.0.0",
+        "object.assign": "^4.1.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 533d1e5..3490754 100644
--- a/package.json
+++ b/package.json
@@ -1,9 +1,10 @@
 {
   "name": "reveal.js-menu",
-  "version": "1.2.0",
+  "version": "2.0.0",
   "description": "A slideout menu for navigating reveal.js presentations",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build": "gulp"
   },
   "repository": {
     "type": "git",
@@ -14,9 +15,21 @@
     "menu"
   ],
   "author": "Greg Denehy",
-  "license": "MIT, Copyright (C) 2016 Greg Denehy",
+  "license": "MIT, Copyright (C) 2020 Greg Denehy",
   "bugs": {
     "url": "https://github.com/denehyg/reveal.js-menu/issues"
   },
-  "homepage": "https://github.com/denehyg/reveal.js-menu#readme"
+  "homepage": "https://github.com/denehyg/reveal.js-menu#readme",
+  "devDependencies": {
+    "@babel/core": "^7.10.4",
+    "@babel/preset-env": "^7.10.4",
+    "@rollup/plugin-babel": "^5.0.4",
+    "@rollup/plugin-commonjs": "^13.0.0",
+    "@rollup/plugin-node-resolve": "^8.1.0",
+    "babel-plugin-transform-html-import-to-string": "0.0.1",
+    "core-js": "^3.6.5",
+    "gulp": "^4.0.2",
+    "rollup": "^2.21.0",
+    "rollup-plugin-terser": "^6.1.0"
+  }
 }
diff --git a/plugin.js b/plugin.js
new file mode 100644
index 0000000..6b7832d
--- /dev/null
+++ b/plugin.js
@@ -0,0 +1,1239 @@
+/*
+ * Reveal.js menu plugin
+ * MIT licensed
+ * (c) Greg Denehy 2020
+ */
+
+const Plugin = () => {
+  const ieVersion = (function () {
+    let browser = /(msie) ([\w.]+)/.exec(
+      window.navigator.userAgent.toLowerCase()
+    );
+    if (browser && browser[1] === 'msie') {
+      return parseFloat(browser[2]);
+    }
+    return null;
+  })();
+
+  var deck;
+  var config;
+  var options;
+  var initialised = false;
+
+  function scriptPath() {
+    // obtain plugin path from the script element
+    var path;
+
+    const script = document.querySelector('script[src$="menu.js"]');
+    if (script) {
+      var sel = document.querySelector('script[src$="menu.js"]');
+      if (sel) {
+        path = sel.src.slice(0, -7);
+      }
+    } else {
+      path = import.meta.url.slice(0, import.meta.url.lastIndexOf('/') + 1);
+    }
+
+    return path;
+  }
+
+  function initOptions(config) {
+    options = config.menu || {};
+    options.path = options.path || scriptPath() || 'plugin/menu/';
+    if (!options.path.endsWith('/')) {
+      options.path += '/';
+    }
+
+    // Set defaults
+    if (options.side === undefined) options.side = 'left';
+
+    if (options.numbers === undefined) options.numbers = false;
+
+    if (typeof options.titleSelector !== 'string')
+      options.titleSelector = 'h1, h2, h3, h4, h5';
+
+    if (options.hideMissingTitles === undefined)
+      options.hideMissingTitles = false;
+
+    if (options.useTextContentForMissingTitles === undefined)
+      options.useTextContentForMissingTitles = false;
+
+    if (options.markers === undefined) options.markers = true;
+
+    if (typeof options.themesPath !== 'string')
+      options.themesPath = 'css/theme/';
+    if (!options.themesPath.endsWith('/')) options.themesPath += '/';
+
+    if (!select('link#theme')) options.themes = false;
+    if (options.themes === true) {
+      options.themes = [
+        { name: 'Black', theme: options.themesPath + 'black.css' },
+        { name: 'White', theme: options.themesPath + 'white.css' },
+        { name: 'League', theme: options.themesPath + 'league.css' },
+        { name: 'Sky', theme: options.themesPath + 'sky.css' },
+        { name: 'Beige', theme: options.themesPath + 'beige.css' },
+        { name: 'Simple', theme: options.themesPath + 'simple.css' },
+        { name: 'Serif', theme: options.themesPath + 'serif.css' },
+        { name: 'Blood', theme: options.themesPath + 'blood.css' },
+        { name: 'Night', theme: options.themesPath + 'night.css' },
+        { name: 'Moon', theme: options.themesPath + 'moon.css' },
+        { name: 'Solarized', theme: options.themesPath + 'solarized.css' }
+      ];
+    } else if (!Array.isArray(options.themes)) {
+      options.themes = false;
+    }
+
+    if (options.transitions === undefined) options.transitions = false;
+    if (options.transitions === true) {
+      options.transitions = [
+        'None',
+        'Fade',
+        'Slide',
+        'Convex',
+        'Concave',
+        'Zoom'
+      ];
+    } else if (
+      options.transitions !== false &&
+      (!Array.isArray(options.transitions) ||
+        !options.transitions.every(function (e) {
+          return typeof e === 'string';
+        }))
+    ) {
+      console.error(
+        "reveal.js-menu error: transitions config value must be 'true' or an array of strings, eg ['None', 'Fade', 'Slide')"
+      );
+      options.transitions = false;
+    }
+    if (ieVersion && ieVersion <= 9) {
+      // transitions aren't support in IE9 anyway, so no point in showing them
+      options.transitions = false;
+    }
+
+    if (typeof options.openButton === 'undefined') options.openButton = true;
+
+    if (typeof options.openSlideNumber === 'undefined')
+      options.openSlideNumber = false;
+
+    if (typeof options.keyboard === 'undefined') options.keyboard = true;
+
+    if (typeof options.sticky === 'undefined') options.sticky = false;
+
+    if (typeof options.autoOpen === 'undefined') options.autoOpen = true;
+
+    if (typeof options.delayInit === 'undefined') options.delayInit = false;
+
+    if (typeof options.openOnInit === 'undefined') options.openOnInit = false;
+  }
+
+  var mouseSelectionEnabled = true;
+  function disableMouseSelection() {
+    mouseSelectionEnabled = false;
+  }
+
+  function reenableMouseSelection() {
+    // wait until the mouse has moved before re-enabling mouse selection
+    // to avoid selections on scroll
+    select('nav.slide-menu').addEventListener('mousemove', function fn(e) {
+      select('nav.slide-menu').removeEventListener('mousemove', fn);
+      //XXX this should select the item under the mouse
+      mouseSelectionEnabled = true;
+    });
+  }
+
+  //
+  // Keyboard handling
+  //
+  function getOffset(el) {
+    var _x = 0;
+    var _y = 0;
+    while (el && !isNaN(el.offsetLeft) && !isNaN(el.offsetTop)) {
+      _x += el.offsetLeft - el.scrollLeft;
+      _y += el.offsetTop - el.scrollTop;
+      el = el.offsetParent;
+    }
+    return { top: _y, left: _x };
+  }
+
+  function visibleOffset(el) {
+    var offsetFromTop = getOffset(el).top - el.offsetParent.offsetTop;
+    if (offsetFromTop < 0) return -offsetFromTop;
+    var offsetFromBottom =
+      el.offsetParent.offsetHeight -
+      (el.offsetTop - el.offsetParent.scrollTop + el.offsetHeight);
+    if (offsetFromBottom < 0) return offsetFromBottom;
+    return 0;
+  }
+
+  function keepVisible(el) {
+    var offset = visibleOffset(el);
+    if (offset) {
+      disableMouseSelection();
+      el.scrollIntoView(offset > 0);
+      reenableMouseSelection();
+    }
+  }
+
+  function scrollItemToTop(el) {
+    disableMouseSelection();
+    el.offsetParent.scrollTop = el.offsetTop;
+    reenableMouseSelection();
+  }
+
+  function scrollItemToBottom(el) {
+    disableMouseSelection();
+    el.offsetParent.scrollTop =
+      el.offsetTop - el.offsetParent.offsetHeight + el.offsetHeight;
+    reenableMouseSelection();
+  }
+
+  function selectItem(el) {
+    el.classList.add('selected');
+    keepVisible(el);
+    if (options.sticky && options.autoOpen) openItem(el);
+  }
+
+  function onDocumentKeyDown(event) {
+    // opening menu is handled by registering key binding with Reveal below
+    if (isOpen()) {
+      event.stopImmediatePropagation();
+      switch (event.keyCode) {
+        // case 77:
+        // 	closeMenu();
+        // 	break;
+        // h, left - change panel
+        case 72:
+        case 37:
+          prevPanel();
+          break;
+        // l, right - change panel
+        case 76:
+        case 39:
+          nextPanel();
+          break;
+        // k, up
+        case 75:
+        case 38:
+          var currItem =
+            select('.active-menu-panel .slide-menu-items li.selected') ||
+            select('.active-menu-panel .slide-menu-items li.active');
+          if (currItem) {
+            selectAll('.active-menu-panel .slide-menu-items li').forEach(
+              function (item) {
+                item.classList.remove('selected');
+              }
+            );
+            var nextItem =
+              select(
+                '.active-menu-panel .slide-menu-items li[data-item="' +
+                  (parseInt(currItem.getAttribute('data-item')) - 1) +
+                  '"]'
+              ) || currItem;
+            selectItem(nextItem);
+          } else {
+            var item = select(
+              '.active-menu-panel .slide-menu-items li.slide-menu-item'
+            );
+            if (item) selectItem(item);
+          }
+          break;
+        // j, down
+        case 74:
+        case 40:
+          var currItem =
+            select('.active-menu-panel .slide-menu-items li.selected') ||
+            select('.active-menu-panel .slide-menu-items li.active');
+          if (currItem) {
+            selectAll('.active-menu-panel .slide-menu-items li').forEach(
+              function (item) {
+                item.classList.remove('selected');
+              }
+            );
+            var nextItem =
+              select(
+                '.active-menu-panel .slide-menu-items li[data-item="' +
+                  (parseInt(currItem.getAttribute('data-item')) + 1) +
+                  '"]'
+              ) || currItem;
+            selectItem(nextItem);
+          } else {
+            var item = select(
+              '.active-menu-panel .slide-menu-items li.slide-menu-item'
+            );
+            if (item) selectItem(item);
+          }
+          break;
+        // pageup, u
+        case 33:
+        case 85:
+          var itemsAbove = selectAll(
+            '.active-menu-panel .slide-menu-items li'
+          ).filter(function (item) {
+            return visibleOffset(item) > 0;
+          });
+          var visibleItems = selectAll(
+            '.active-menu-panel .slide-menu-items li'
+          ).filter(function (item) {
+            return visibleOffset(item) == 0;
+          });
+
+          var firstVisible =
+            itemsAbove.length > 0 &&
+            Math.abs(visibleOffset(itemsAbove[itemsAbove.length - 1])) <
+              itemsAbove[itemsAbove.length - 1].clientHeight
+              ? itemsAbove[itemsAbove.length - 1]
+              : visibleItems[0];
+          if (firstVisible) {
+            if (
+              firstVisible.classList.contains('selected') &&
+              itemsAbove.length > 0
+            ) {
+              // at top of viewport already, page scroll (if not at start)
+              // ...move selected item to bottom, and change selection to last fully visible item at top
+              scrollItemToBottom(firstVisible);
+              visibleItems = selectAll(
+                '.active-menu-panel .slide-menu-items li'
+              ).filter(function (item) {
+                return visibleOffset(item) == 0;
+              });
+              if (visibleItems[0] == firstVisible) {
+                // prev item is still beyond the viewport (for custom panels)
+                firstVisible = itemsAbove[itemsAbove.length - 1];
+              } else {
+                firstVisible = visibleItems[0];
+              }
+            }
+            selectAll('.active-menu-panel .slide-menu-items li').forEach(
+              function (item) {
+                item.classList.remove('selected');
+              }
+            );
+            selectItem(firstVisible);
+            // ensure selected item is positioned at the top of the viewport
+            scrollItemToTop(firstVisible);
+          }
+          break;
+        // pagedown, d
+        case 34:
+        case 68:
+          var visibleItems = selectAll(
+            '.active-menu-panel .slide-menu-items li'
+          ).filter(function (item) {
+            return visibleOffset(item) == 0;
+          });
+          var itemsBelow = selectAll(
+            '.active-menu-panel .slide-menu-items li'
+          ).filter(function (item) {
+            return visibleOffset(item) < 0;
+          });
+
+          var lastVisible =
+            itemsBelow.length > 0 &&
+            Math.abs(visibleOffset(itemsBelow[0])) < itemsBelow[0].clientHeight
+              ? itemsBelow[0]
+              : visibleItems[visibleItems.length - 1];
+          if (lastVisible) {
+            if (
+              lastVisible.classList.contains('selected') &&
+              itemsBelow.length > 0
+            ) {
+              // at bottom of viewport already, page scroll (if not at end)
+              // ...move selected item to top, and change selection to last fully visible item at bottom
+              scrollItemToTop(lastVisible);
+              visibleItems = selectAll(
+                '.active-menu-panel .slide-menu-items li'
+              ).filter(function (item) {
+                return visibleOffset(item) == 0;
+              });
+              if (visibleItems[visibleItems.length - 1] == lastVisible) {
+                // next item is still beyond the viewport (for custom panels)
+                lastVisible = itemsBelow[0];
+              } else {
+                lastVisible = visibleItems[visibleItems.length - 1];
+              }
+            }
+            selectAll('.active-menu-panel .slide-menu-items li').forEach(
+              function (item) {
+                item.classList.remove('selected');
+              }
+            );
+            selectItem(lastVisible);
+            // ensure selected item is positioned at the bottom of the viewport
+            scrollItemToBottom(lastVisible);
+          }
+          break;
+        // home
+        case 36:
+          selectAll('.active-menu-panel .slide-menu-items li').forEach(
+            function (item) {
+              item.classList.remove('selected');
+            }
+          );
+          var item = select(
+            '.active-menu-panel .slide-menu-items li:first-of-type'
+          );
+          if (item) {
+            item.classList.add('selected');
+            keepVisible(item);
+          }
+          break;
+        // end
+        case 35:
+          selectAll('.active-menu-panel .slide-menu-items li').forEach(
+            function (item) {
+              item.classList.remove('selected');
+            }
+          );
+          var item = select(
+            '.active-menu-panel .slide-menu-items:last-of-type li:last-of-type'
+          );
+          if (item) {
+            item.classList.add('selected');
+            keepVisible(item);
+          }
+          break;
+        // space, return
+        case 32:
+        case 13:
+          var currItem = select(
+            '.active-menu-panel .slide-menu-items li.selected'
+          );
+          if (currItem) {
+            openItem(currItem, true);
+          }
+          break;
+        // esc
+        case 27:
+          closeMenu(null, true);
+          break;
+      }
+    }
+  }
+
+  //
+  // Utilty functions
+  //
+
+  function openMenu(event) {
+    if (event) event.preventDefault();
+    if (!isOpen()) {
+      select('body').classList.add('slide-menu-active');
+      select('.reveal').classList.add(
+        'has-' + options.effect + '-' + options.side
+      );
+      select('.slide-menu').classList.add('active');
+      select('.slide-menu-overlay').classList.add('active');
+
+      // identify active theme
+      if (options.themes) {
+        selectAll('div[data-panel="Themes"] li').forEach(function (i) {
+          i.classList.remove('active');
+        });
+        selectAll(
+          'li[data-theme="' + select('link#theme').getAttribute('href') + '"]'
+        ).forEach(function (i) {
+          i.classList.add('active');
+        });
+      }
+
+      // identify active transition
+      if (options.transitions) {
+        selectAll('div[data-panel="Transitions"] li').forEach(function (i) {
+          i.classList.remove('active');
+        });
+        selectAll('li[data-transition="' + config.transition + '"]').forEach(
+          function (i) {
+            i.classList.add('active');
+          }
+        );
+      }
+
+      // set item selections to match active items
+      var items = selectAll('.slide-menu-panel li.active');
+      items.forEach(function (i) {
+        i.classList.add('selected');
+        keepVisible(i);
+      });
+    }
+  }
+
+  function closeMenu(event, force) {
+    if (event) event.preventDefault();
+    if (!options.sticky || force) {
+      select('body').classList.remove('slide-menu-active');
+      select('.reveal').classList.remove(
+        'has-' + options.effect + '-' + options.side
+      );
+      select('.slide-menu').classList.remove('active');
+      select('.slide-menu-overlay').classList.remove('active');
+      selectAll('.slide-menu-panel li.selected').forEach(function (i) {
+        i.classList.remove('selected');
+      });
+    }
+  }
+
+  function toggleMenu(event) {
+    if (isOpen()) {
+      closeMenu(event, true);
+    } else {
+      openMenu(event);
+    }
+  }
+
+  function isOpen() {
+    return select('body').classList.contains('slide-menu-active');
+  }
+
+  function openPanel(event, ref) {
+    openMenu(event);
+    var panel = ref;
+    if (typeof ref !== 'string') {
+      panel = event.currentTarget.getAttribute('data-panel');
+    }
+    select('.slide-menu-toolbar > li.active-toolbar-button').classList.remove(
+      'active-toolbar-button'
+    );
+    select('li[data-panel="' + panel + '"]').classList.add(
+      'active-toolbar-button'
+    );
+    select('.slide-menu-panel.active-menu-panel').classList.remove(
+      'active-menu-panel'
+    );
+    select('div[data-panel="' + panel + '"]').classList.add(
+      'active-menu-panel'
+    );
+  }
+
+  function nextPanel() {
+    var next =
+      (parseInt(select('.active-toolbar-button').getAttribute('data-button')) +
+        1) %
+      buttons;
+    openPanel(
+      null,
+      select('.toolbar-panel-button[data-button="' + next + '"]').getAttribute(
+        'data-panel'
+      )
+    );
+  }
+
+  function prevPanel() {
+    var next =
+      parseInt(select('.active-toolbar-button').getAttribute('data-button')) -
+      1;
+    if (next < 0) {
+      next = buttons - 1;
+    }
+    openPanel(
+      null,
+      select('.toolbar-panel-button[data-button="' + next + '"]').getAttribute(
+        'data-panel'
+      )
+    );
+  }
+
+  function openItem(item, force) {
+    var h = parseInt(item.getAttribute('data-slide-h'));
+    var v = parseInt(item.getAttribute('data-slide-v'));
+    var theme = item.getAttribute('data-theme');
+    var transition = item.getAttribute('data-transition');
+    if (!isNaN(h) && !isNaN(v)) {
+      deck.slide(h, v);
+      closeMenu();
+    } else if (theme) {
+      // take note of the previous theme and remove it, then create a new stylesheet reference and insert it
+      // this is required to force a load event so we can change the menu style to match the new style
+      var stylesheet = select('link#theme');
+      var parent = stylesheet.parentElement;
+      var sibling = stylesheet.nextElementSibling;
+      stylesheet.remove();
+
+      var newStylesheet = stylesheet.cloneNode();
+      newStylesheet.setAttribute('href', theme);
+      newStylesheet.onload = function () {
+        matchRevealStyle();
+      };
+      parent.insertBefore(newStylesheet, sibling);
+
+      closeMenu();
+    } else if (transition) {
+      deck.configure({ transition: transition });
+      closeMenu();
+    } else {
+      var link = select('a', item);
+      if (link) {
+        if (
+          force ||
+          !options.sticky ||
+          (options.autoOpen && link.href.startsWith('#')) ||
+          link.href.startsWith(
+            window.location.origin + window.location.pathname + '#'
+          )
+        ) {
+          link.click();
+        }
+      }
+      closeMenu();
+    }
+  }
+
+  function clicked(event) {
+    if (event.target.nodeName !== 'A') {
+      event.preventDefault();
+    }
+    openItem(event.currentTarget);
+  }
+
+  function highlightCurrentSlide() {
+    var state = deck.getState();
+    selectAll('li.slide-menu-item, li.slide-menu-item-vertical').forEach(
+      function (item) {
+        item.classList.remove('past');
+        item.classList.remove('active');
+        item.classList.remove('future');
+
+        var h = parseInt(item.getAttribute('data-slide-h'));
+        var v = parseInt(item.getAttribute('data-slide-v'));
+        if (h < state.indexh || (h === state.indexh && v < state.indexv)) {
+          item.classList.add('past');
+        } else if (h === state.indexh && v === state.indexv) {
+          item.classList.add('active');
+        } else {
+          item.classList.add('future');
+        }
+      }
+    );
+  }
+
+  function matchRevealStyle() {
+    var revealStyle = window.getComputedStyle(select('.reveal'));
+    var element = select('.slide-menu');
+    element.style.fontFamily = revealStyle.fontFamily;
+    //XXX could adjust the complete menu style to match the theme, ie colors, etc
+  }
+
+  var buttons = 0;
+  function initMenu() {
+    if (!initialised) {
+      var parent = select('.reveal').parentElement;
+      var top = create('div', { class: 'slide-menu-wrapper' });
+      parent.appendChild(top);
+      var panels = create('nav', {
+        class: 'slide-menu slide-menu--' + options.side
+      });
+      if (typeof options.width === 'string') {
+        if (
+          ['normal', 'wide', 'third', 'half', 'full'].indexOf(options.width) !=
+          -1
+        ) {
+          panels.classList.add('slide-menu--' + options.width);
+        } else {
+          panels.classList.add('slide-menu--custom');
+          panels.style.width = options.width;
+        }
+      }
+      top.appendChild(panels);
+      matchRevealStyle();
+      var overlay = create('div', { class: 'slide-menu-overlay' });
+      top.appendChild(overlay);
+      overlay.onclick = function () {
+        closeMenu(null, true);
+      };
+
+      var toolbar = create('ol', { class: 'slide-menu-toolbar' });
+      select('.slide-menu').appendChild(toolbar);
+
+      function addToolbarButton(title, ref, icon, style, fn, active) {
+        var attrs = {
+          'data-button': '' + buttons++,
+          class:
+            'toolbar-panel-button' + (active ? ' active-toolbar-button' : '')
+        };
+        if (ref) {
+          attrs['data-panel'] = ref;
+        }
+        var button = create('li', attrs);
+
+        if (icon.startsWith('fa-')) {
+          button.appendChild(create('i', { class: style + ' ' + icon }));
+        } else {
+          button.innerHTML = icon + '</i>';
+        }
+        button.appendChild(create('br'), select('i', button));
+        button.appendChild(
+          create('span', { class: 'slide-menu-toolbar-label' }, title),
+          select('i', button)
+        );
+        button.onclick = fn;
+        toolbar.appendChild(button);
+        return button;
+      }
+
+      addToolbarButton('Slides', 'Slides', 'fa-images', 'fas', openPanel, true);
+
+      if (options.custom) {
+        options.custom.forEach(function (element, index, array) {
+          addToolbarButton(
+            element.title,
+            'Custom' + index,
+            element.icon,
+            null,
+            openPanel
+          );
+        });
+      }
+
+      if (options.themes) {
+        addToolbarButton('Themes', 'Themes', 'fa-adjust', 'fas', openPanel);
+      }
+      if (options.transitions) {
+        addToolbarButton(
+          'Transitions',
+          'Transitions',
+          'fa-sticky-note',
+          'fas',
+          openPanel
+        );
+      }
+      var button = create('li', {
+        id: 'close',
+        class: 'toolbar-panel-button'
+      });
+      button.appendChild(create('i', { class: 'fas fa-times' }));
+      button.appendChild(create('br'));
+      button.appendChild(
+        create('span', { class: 'slide-menu-toolbar-label' }, 'Close')
+      );
+      button.onclick = function () {
+        closeMenu(null, true);
+      };
+      toolbar.appendChild(button);
+
+      //
+      // Slide links
+      //
+      function generateItem(type, section, i, h, v) {
+        var link = '/#/' + h;
+        if (typeof v === 'number' && !isNaN(v)) link += '/' + v;
+
+        function text(selector, parent) {
+          if (selector === '') return null;
+          var el = parent ? select(selector, section) : select(selector);
+          if (el) return el.textContent;
+          return null;
+        }
+        var title =
+          section.getAttribute('data-menu-title') ||
+          text('.menu-title', section) ||
+          text(options.titleSelector, section);
+
+        if (!title && options.useTextContentForMissingTitles) {
+          // attempt to figure out a title based on the text in the slide
+          title = section.textContent.trim();
+          if (title) {
+            title =
+              title
+                .split('\n')
+                .map(function (t) {
+                  return t.trim();
+                })
+                .join(' ')
+                .trim()
+                .replace(/^(.{16}[^\s]*).*/, '$1') // limit to 16 chars plus any consecutive non-whitespace chars (to avoid breaking words)
+                .replace(/&/g, '&amp;')
+                .replace(/</g, '&lt;')
+                .replace(/>/g, '&gt;')
+                .replace(/"/g, '&quot;')
+                .replace(/'/g, '&#039;') + '...';
+          }
+        }
+
+        if (!title) {
+          if (options.hideMissingTitles) return '';
+          type += ' no-title';
+          title = 'Slide ' + (i + 1);
+        }
+
+        var item = create('li', {
+          class: type,
+          'data-item': i,
+          'data-slide-h': h,
+          'data-slide-v': v === undefined ? 0 : v
+        });
+
+        if (options.markers) {
+          item.appendChild(
+            create('i', { class: 'fas fa-check-circle fa-fw past' })
+          );
+          item.appendChild(
+            create('i', {
+              class: 'fas fa-arrow-alt-circle-right fa-fw active'
+            })
+          );
+          item.appendChild(
+            create('i', { class: 'far fa-circle fa-fw future' })
+          );
+        }
+
+        if (options.numbers) {
+          // Number formatting taken from reveal.js
+          var value = [];
+          var format = 'h.v';
+
+          // Check if a custom number format is available
+          if (typeof options.numbers === 'string') {
+            format = options.numbers;
+          } else if (typeof config.slideNumber === 'string') {
+            // Take user defined number format for slides
+            format = config.slideNumber;
+          }
+
+          switch (format) {
+            case 'c':
+              value.push(i + 1);
+              break;
+            case 'c/t':
+              value.push(i + 1, '/', deck.getTotalSlides());
+              break;
+            case 'h/v':
+              value.push(h + 1);
+              if (typeof v === 'number' && !isNaN(v)) value.push('/', v + 1);
+              break;
+            default:
+              value.push(h + 1);
+              if (typeof v === 'number' && !isNaN(v)) value.push('.', v + 1);
+          }
+
+          item.appendChild(
+            create(
+              'span',
+              { class: 'slide-menu-item-number' },
+              value.join('') + '. '
+            )
+          );
+        }
+
+        item.appendChild(
+          create('span', { class: 'slide-menu-item-title' }, title)
+        );
+
+        return item;
+      }
+
+      function createSlideMenu() {
+        if (
+          !document.querySelector(
+            'section[data-markdown]:not([data-markdown-parsed])'
+          )
+        ) {
+          var panel = create('div', {
+            'data-panel': 'Slides',
+            class: 'slide-menu-panel active-menu-panel'
+          });
+          panel.appendChild(create('ul', { class: 'slide-menu-items' }));
+          panels.appendChild(panel);
+          var items = select(
+            '.slide-menu-panel[data-panel="Slides"] > .slide-menu-items'
+          );
+          var slideCount = 0;
+          selectAll('.slides > section').forEach(function (section, h) {
+            var subsections = selectAll('section', section);
+            if (subsections.length > 0) {
+              subsections.forEach(function (subsection, v) {
+                var type =
+                  v === 0 ? 'slide-menu-item' : 'slide-menu-item-vertical';
+                var item = generateItem(type, subsection, slideCount, h, v);
+                if (item) {
+                  items.appendChild(item);
+                }
+                slideCount++;
+              });
+            } else {
+              var item = generateItem(
+                'slide-menu-item',
+                section,
+                slideCount,
+                h
+              );
+              if (item) {
+                items.appendChild(item);
+              }
+              slideCount++;
+            }
+          });
+          selectAll('.slide-menu-item, .slide-menu-item-vertical').forEach(
+            function (i) {
+              i.onclick = clicked;
+            }
+          );
+          highlightCurrentSlide();
+        } else {
+          // wait for markdown to be loaded and parsed
+          setTimeout(createSlideMenu, 100);
+        }
+      }
+
+      createSlideMenu();
+      deck.addEventListener('slidechanged', highlightCurrentSlide);
+
+      //
+      // Custom menu panels
+      //
+      if (options.custom) {
+        function xhrSuccess() {
+          if (this.status >= 200 && this.status < 300) {
+            this.panel.innerHTML = this.responseText;
+            enableCustomLinks(this.panel);
+          } else {
+            showErrorMsg(this);
+          }
+        }
+        function xhrError() {
+          showErrorMsg(this);
+        }
+        function loadCustomPanelContent(panel, sURL) {
+          var oReq = new XMLHttpRequest();
+          oReq.panel = panel;
+          oReq.arguments = Array.prototype.slice.call(arguments, 2);
+          oReq.onload = xhrSuccess;
+          oReq.onerror = xhrError;
+          oReq.open('get', sURL, true);
+          oReq.send(null);
+        }
+        function enableCustomLinks(panel) {
+          selectAll('ul.slide-menu-items li.slide-menu-item', panel).forEach(
+            function (item, i) {
+              item.setAttribute('data-item', i + 1);
+              item.onclick = clicked;
+              item.addEventListener('mouseenter', handleMouseHighlight);
+            }
+          );
+        }
+
+        function showErrorMsg(response) {
+          var msg =
+            '<p>ERROR: The attempt to fetch ' +
+            response.responseURL +
+            ' failed with HTTP status ' +
+            response.status +
+            ' (' +
+            response.statusText +
+            ').</p>' +
+            '<p>Remember that you need to serve the presentation HTML from a HTTP server.</p>';
+          response.panel.innerHTML = msg;
+        }
+
+        options.custom.forEach(function (element, index, array) {
+          var panel = create('div', {
+            'data-panel': 'Custom' + index,
+            class: 'slide-menu-panel slide-menu-custom-panel'
+          });
+          if (element.content) {
+            panel.innerHTML = element.content;
+            enableCustomLinks(panel);
+          } else if (element.src) {
+            loadCustomPanelContent(panel, element.src);
+          }
+          panels.appendChild(panel);
+        });
+      }
+
+      //
+      // Themes
+      //
+      if (options.themes) {
+        var panel = create('div', {
+          class: 'slide-menu-panel',
+          'data-panel': 'Themes'
+        });
+        panels.appendChild(panel);
+        var menu = create('ul', { class: 'slide-menu-items' });
+        panel.appendChild(menu);
+        options.themes.forEach(function (t, i) {
+          var item = create(
+            'li',
+            {
+              class: 'slide-menu-item',
+              'data-theme': t.theme,
+              'data-item': '' + (i + 1)
+            },
+            t.name
+          );
+          menu.appendChild(item);
+          item.onclick = clicked;
+        });
+      }
+
+      //
+      // Transitions
+      //
+      if (options.transitions) {
+        var panel = create('div', {
+          class: 'slide-menu-panel',
+          'data-panel': 'Transitions'
+        });
+        panels.appendChild(panel);
+        var menu = create('ul', { class: 'slide-menu-items' });
+        panel.appendChild(menu);
+        options.transitions.forEach(function (name, i) {
+          var item = create(
+            'li',
+            {
+              class: 'slide-menu-item',
+              'data-transition': name.toLowerCase(),
+              'data-item': '' + (i + 1)
+            },
+            name
+          );
+          menu.appendChild(item);
+          item.onclick = clicked;
+        });
+      }
+
+      //
+      // Open menu options
+      //
+      if (options.openButton) {
+        // add menu button
+        var div = create('div', { class: 'slide-menu-button' });
+        var link = create('a', { href: '#' });
+        link.appendChild(create('i', { class: 'fas fa-bars' }));
+        div.appendChild(link);
+        select('.reveal').appendChild(div);
+        div.onclick = openMenu;
+      }
+
+      if (options.openSlideNumber) {
+        var slideNumber = select('div.slide-number');
+        slideNumber.onclick = openMenu;
+      }
+
+      //
+      // Handle mouse overs
+      //
+      selectAll('.slide-menu-panel .slide-menu-items li').forEach(function (
+        item
+      ) {
+        item.addEventListener('mouseenter', handleMouseHighlight);
+      });
+
+      function handleMouseHighlight(event) {
+        if (mouseSelectionEnabled) {
+          selectAll('.active-menu-panel .slide-menu-items li.selected').forEach(
+            function (i) {
+              i.classList.remove('selected');
+            }
+          );
+          event.currentTarget.classList.add('selected');
+        }
+      }
+    }
+
+    if (options.keyboard) {
+      //XXX add keyboard option for custom key codes, etc.
+
+      document.addEventListener('keydown', onDocumentKeyDown, false);
+
+      // handle key presses within speaker notes
+      window.addEventListener('message', function (event) {
+        var data;
+        try {
+          data = JSON.parse(event.data);
+        } catch (e) {}
+        if (data && data.method === 'triggerKey') {
+          onDocumentKeyDown({
+            keyCode: data.args[0],
+            stopImmediatePropagation: function () {}
+          });
+        }
+      });
+
+      // Prevent reveal from processing keyboard events when the menu is open
+      if (
+        config.keyboardCondition &&
+        typeof config.keyboardCondition === 'function'
+      ) {
+        // combine user defined keyboard condition with the menu's own condition
+        var userCondition = config.keyboardCondition;
+        config.keyboardCondition = function (event) {
+          return userCondition(event) && (!isOpen() || event.keyCode == 77);
+        };
+      } else {
+        config.keyboardCondition = function (event) {
+          return !isOpen() || event.keyCode == 77;
+        };
+      }
+
+      deck.addKeyBinding(
+        { keyCode: 77, key: 'M', description: 'Toggle menu' },
+        toggleMenu
+      );
+    }
+
+    if (options.openOnInit) {
+      openMenu();
+    }
+
+    initialised = true;
+  }
+
+  /**
+   * Extend object a with the properties of object b.
+   * If there's a conflict, object b takes precedence.
+   */
+  function extend(a, b) {
+    for (var i in b) {
+      a[i] = b[i];
+    }
+  }
+
+  /**
+   * Dispatches an event of the specified type from the
+   * reveal DOM element.
+   */
+  function dispatchEvent(type, args) {
+    var event = document.createEvent('HTMLEvents', 1, 2);
+    event.initEvent(type, true, true);
+    extend(event, args);
+    document.querySelector('.reveal').dispatchEvent(event);
+
+    // If we're in an iframe, post each reveal.js event to the
+    // parent window. Used by the notes plugin
+    if (config.postMessageEvents && window.parent !== window.self) {
+      window.parent.postMessage(
+        JSON.stringify({
+          namespace: 'reveal',
+          eventName: type,
+          state: deck.getState()
+        }),
+        '*'
+      );
+    }
+  }
+
+  function select(selector, el) {
+    if (!el) {
+      el = document;
+    }
+    return el.querySelector(selector);
+  }
+
+  function selectAll(selector, el) {
+    if (!el) {
+      el = document;
+    }
+    return Array.prototype.slice.call(el.querySelectorAll(selector));
+  }
+
+  function create(tagName, attrs, content) {
+    var el = document.createElement(tagName);
+    if (attrs) {
+      Object.getOwnPropertyNames(attrs).forEach(function (n) {
+        el.setAttribute(n, attrs[n]);
+      });
+    }
+    if (content) el.innerHTML = content;
+    return el;
+  }
+
+  // modified from math plugin
+  function loadResource(url, type, callback) {
+    var head = document.querySelector('head');
+    var resource;
+
+    if (type === 'script') {
+      resource = document.createElement('script');
+      resource.type = 'text/javascript';
+      resource.src = url;
+    } else if (type === 'stylesheet') {
+      resource = document.createElement('link');
+      resource.rel = 'stylesheet';
+      resource.href = url;
+    }
+
+    // Wrapper for callback to make sure it only fires once
+    var finish = function () {
+      if (typeof callback === 'function') {
+        callback.call();
+        callback = null;
+      }
+    };
+
+    resource.onload = finish;
+
+    // IE
+    resource.onreadystatechange = function () {
+      if (this.readyState === 'loaded') {
+        finish();
+      }
+    };
+
+    // Normal browsers
+    head.appendChild(resource);
+  }
+
+  function loadPlugin() {
+    // does not support IE8 or below
+    var supported = !ieVersion || ieVersion >= 9;
+
+    // do not load the menu in the upcoming slide panel in the speaker notes
+    if (
+      deck.isSpeakerNotes() &&
+      window.location.search.endsWith('controls=false')
+    ) {
+      supported = false;
+    }
+
+    if (supported) {
+      if (!options.delayInit) initMenu();
+      dispatchEvent('menu-ready');
+    }
+  }
+
+  return {
+    id: 'menu',
+    init: reveal => {
+      deck = reveal;
+      config = deck.getConfig();
+      initOptions(config);
+      loadResource(options.path + 'menu.css', 'stylesheet', function () {
+        if (options.loadIcons === undefined || options.loadIcons) {
+          loadResource(
+            options.path + 'font-awesome/css/all.css',
+            'stylesheet',
+            loadPlugin
+          );
+        } else {
+          loadPlugin();
+        }
+      });
+    },
+
+    toggle: toggleMenu,
+    openMenu: openMenu,
+    closeMenu: closeMenu,
+    openPanel: openPanel,
+    isOpen: isOpen,
+    initialiseMenu: initMenu,
+    isMenuInitialised: function () {
+      return initialised;
+    }
+  };
+};
+
+// polyfill
+if (!String.prototype.startsWith) {
+  String.prototype.startsWith = function (searchString, position) {
+    return this.substr(position || 0, searchString.length) === searchString;
+  };
+}
+if (!String.prototype.endsWith) {
+  String.prototype.endsWith = function (search, this_len) {
+    if (this_len === undefined || this_len > this.length) {
+      this_len = this.length;
+    }
+    return this.substring(this_len - search.length, this_len) === search;
+  };
+}
+
+export default Plugin;