Locally add prismjs

node_modules/prismjs/plugins/toolbar/prism-toolbar.css

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+div.code-toolbar {
+	position: relative;
+}
+
+div.code-toolbar > .toolbar {
+	position: absolute;
+	z-index: 10;
+	top: .3em;
+	right: .2em;
+	transition: opacity 0.3s ease-in-out;
+	opacity: 0;
+}
+
+div.code-toolbar:hover > .toolbar {
+	opacity: 1;
+}
+
+/* Separate line b/c rules are thrown out if selector is invalid.
+   IE11 and old Edge versions don't support :focus-within. */
+div.code-toolbar:focus-within > .toolbar {
+	opacity: 1;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item {
+	display: inline-block;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > a {
+	cursor: pointer;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > button {
+	background: none;
+	border: 0;
+	color: inherit;
+	font: inherit;
+	line-height: normal;
+	overflow: visible;
+	padding: 0;
+	-webkit-user-select: none; /* for button */
+	-moz-user-select: none;
+	-ms-user-select: none;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > a,
+div.code-toolbar > .toolbar > .toolbar-item > button,
+div.code-toolbar > .toolbar > .toolbar-item > span {
+	color: #bbb;
+	font-size: .8em;
+	padding: 0 .5em;
+	background: #f5f2f0;
+	background: rgba(224, 224, 224, 0.2);
+	box-shadow: 0 2px 0 0 rgba(0,0,0,0.2);
+	border-radius: .5em;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > a:hover,
+div.code-toolbar > .toolbar > .toolbar-item > a:focus,
+div.code-toolbar > .toolbar > .toolbar-item > button:hover,
+div.code-toolbar > .toolbar > .toolbar-item > button:focus,
+div.code-toolbar > .toolbar > .toolbar-item > span:hover,
+div.code-toolbar > .toolbar > .toolbar-item > span:focus {
+	color: inherit;
+	text-decoration: none;
+}

node_modules/prismjs/plugins/toolbar/prism-toolbar.js

@@ -0,0 +1,179 @@
+(function () {
+
+	if (typeof Prism === 'undefined' || typeof document === 'undefined') {
+		return;
+	}
+
+	var callbacks = [];
+	var map = {};
+	var noop = function () {};
+
+	Prism.plugins.toolbar = {};
+
+	/**
+	 * @typedef ButtonOptions
+	 * @property {string} text The text displayed.
+	 * @property {string} [url] The URL of the link which will be created.
+	 * @property {Function} [onClick] The event listener for the `click` event of the created button.
+	 * @property {string} [className] The class attribute to include with element.
+	 */
+
+	/**
+	 * Register a button callback with the toolbar.
+	 *
+	 * @param {string} key
+	 * @param {ButtonOptions|Function} opts
+	 */
+	var registerButton = Prism.plugins.toolbar.registerButton = function (key, opts) {
+		var callback;
+
+		if (typeof opts === 'function') {
+			callback = opts;
+		} else {
+			callback = function (env) {
+				var element;
+
+				if (typeof opts.onClick === 'function') {
+					element = document.createElement('button');
+					element.type = 'button';
+					element.addEventListener('click', function () {
+						opts.onClick.call(this, env);
+					});
+				} else if (typeof opts.url === 'string') {
+					element = document.createElement('a');
+					element.href = opts.url;
+				} else {
+					element = document.createElement('span');
+				}
+
+				if (opts.className) {
+					element.classList.add(opts.className);
+				}
+
+				element.textContent = opts.text;
+
+				return element;
+			};
+		}
+
+		if (key in map) {
+			console.warn('There is a button with the key "' + key + '" registered already.');
+			return;
+		}
+
+		callbacks.push(map[key] = callback);
+	};
+
+	/**
+	 * Returns the callback order of the given element.
+	 *
+	 * @param {HTMLElement} element
+	 * @returns {string[] | undefined}
+	 */
+	function getOrder(element) {
+		while (element) {
+			var order = element.getAttribute('data-toolbar-order');
+			if (order != null) {
+				order = order.trim();
+				if (order.length) {
+					return order.split(/\s*,\s*/g);
+				} else {
+					return [];
+				}
+			}
+			element = element.parentElement;
+		}
+	}
+
+	/**
+	 * Post-highlight Prism hook callback.
+	 *
+	 * @param env
+	 */
+	var hook = Prism.plugins.toolbar.hook = function (env) {
+		// Check if inline or actual code block (credit to line-numbers plugin)
+		var pre = env.element.parentNode;
+		if (!pre || !/pre/i.test(pre.nodeName)) {
+			return;
+		}
+
+		// Autoloader rehighlights, so only do this once.
+		if (pre.parentNode.classList.contains('code-toolbar')) {
+			return;
+		}
+
+		// Create wrapper for <pre> to prevent scrolling toolbar with content
+		var wrapper = document.createElement('div');
+		wrapper.classList.add('code-toolbar');
+		pre.parentNode.insertBefore(wrapper, pre);
+		wrapper.appendChild(pre);
+
+		// Setup the toolbar
+		var toolbar = document.createElement('div');
+		toolbar.classList.add('toolbar');
+
+		// order callbacks
+		var elementCallbacks = callbacks;
+		var order = getOrder(env.element);
+		if (order) {
+			elementCallbacks = order.map(function (key) {
+				return map[key] || noop;
+			});
+		}
+
+		elementCallbacks.forEach(function (callback) {
+			var element = callback(env);
+
+			if (!element) {
+				return;
+			}
+
+			var item = document.createElement('div');
+			item.classList.add('toolbar-item');
+
+			item.appendChild(element);
+			toolbar.appendChild(item);
+		});
+
+		// Add our toolbar to the currently created wrapper of <pre> tag
+		wrapper.appendChild(toolbar);
+	};
+
+	registerButton('label', function (env) {
+		var pre = env.element.parentNode;
+		if (!pre || !/pre/i.test(pre.nodeName)) {
+			return;
+		}
+
+		if (!pre.hasAttribute('data-label')) {
+			return;
+		}
+
+		var element; var template;
+		var text = pre.getAttribute('data-label');
+		try {
+			// Any normal text will blow up this selector.
+			template = document.querySelector('template#' + text);
+		} catch (e) { /* noop */ }
+
+		if (template) {
+			element = template.content;
+		} else {
+			if (pre.hasAttribute('data-url')) {
+				element = document.createElement('a');
+				element.href = pre.getAttribute('data-url');
+			} else {
+				element = document.createElement('span');
+			}
+
+			element.textContent = text;
+		}
+
+		return element;
+	});
+
+	/**
+	 * Register the toolbar with Prism.
+	 */
+	Prism.hooks.add('complete', hook);
+}());

node_modules/prismjs/plugins/toolbar/prism-toolbar.min.css

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+div.code-toolbar{position:relative}div.code-toolbar>.toolbar{position:absolute;z-index:10;top:.3em;right:.2em;transition:opacity .3s ease-in-out;opacity:0}div.code-toolbar:hover>.toolbar{opacity:1}div.code-toolbar:focus-within>.toolbar{opacity:1}div.code-toolbar>.toolbar>.toolbar-item{display:inline-block}div.code-toolbar>.toolbar>.toolbar-item>a{cursor:pointer}div.code-toolbar>.toolbar>.toolbar-item>button{background:0 0;border:0;color:inherit;font:inherit;line-height:normal;overflow:visible;padding:0;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}div.code-toolbar>.toolbar>.toolbar-item>a,div.code-toolbar>.toolbar>.toolbar-item>button,div.code-toolbar>.toolbar>.toolbar-item>span{color:#bbb;font-size:.8em;padding:0 .5em;background:#f5f2f0;background:rgba(224,224,224,.2);box-shadow:0 2px 0 0 rgba(0,0,0,.2);border-radius:.5em}div.code-toolbar>.toolbar>.toolbar-item>a:focus,div.code-toolbar>.toolbar>.toolbar-item>a:hover,div.code-toolbar>.toolbar>.toolbar-item>button:focus,div.code-toolbar>.toolbar>.toolbar-item>button:hover,div.code-toolbar>.toolbar>.toolbar-item>span:focus,div.code-toolbar>.toolbar>.toolbar-item>span:hover{color:inherit;text-decoration:none}

node_modules/prismjs/plugins/toolbar/prism-toolbar.min.js

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+!function(){if("undefined"!=typeof Prism&&"undefined"!=typeof document){var e=[],t={},n=function(){};Prism.plugins.toolbar={};var a=Prism.plugins.toolbar.registerButton=function(n,a){var r;r="function"==typeof a?a:function(e){var t;return"function"==typeof a.onClick?((t=document.createElement("button")).type="button",t.addEventListener("click",(function(){a.onClick.call(this,e)}))):"string"==typeof a.url?(t=document.createElement("a")).href=a.url:t=document.createElement("span"),a.className&&t.classList.add(a.className),t.textContent=a.text,t},n in t?console.warn('There is a button with the key "'+n+'" registered already.'):e.push(t[n]=r)},r=Prism.plugins.toolbar.hook=function(a){var r=a.element.parentNode;if(r&&/pre/i.test(r.nodeName)&&!r.parentNode.classList.contains("code-toolbar")){var o=document.createElement("div");o.classList.add("code-toolbar"),r.parentNode.insertBefore(o,r),o.appendChild(r);var i=document.createElement("div");i.classList.add("toolbar");var l=e,d=function(e){for(;e;){var t=e.getAttribute("data-toolbar-order");if(null!=t)return(t=t.trim()).length?t.split(/\s*,\s*/g):[];e=e.parentElement}}(a.element);d&&(l=d.map((function(e){return t[e]||n}))),l.forEach((function(e){var t=e(a);if(t){var n=document.createElement("div");n.classList.add("toolbar-item"),n.appendChild(t),i.appendChild(n)}})),o.appendChild(i)}};a("label",(function(e){var t=e.element.parentNode;if(t&&/pre/i.test(t.nodeName)&&t.hasAttribute("data-label")){var n,a,r=t.getAttribute("data-label");try{a=document.querySelector("template#"+r)}catch(e){}return a?n=a.content:(t.hasAttribute("data-url")?(n=document.createElement("a")).href=t.getAttribute("data-url"):n=document.createElement("span"),n.textContent=r),n}})),Prism.hooks.add("complete",r)}}();