Rocket.Chat/public/elements/github-fork.html

<template>
	<style>
		.github-fork {
			position: fixed;
			display: block;
			width: 330px;
			z-index: 901;
			right: -70px;
			top: 72px;
			background-size: 100% auto;
			cursor: pointer;
			background-color: #5c5c5c;
			color: #f0f0f0;
			padding: 1em 0 0.95em;
			line-height: 1.04em;
			text-decoration: none;
			font-family: Montserrat;
			font-size: 1.04em;
			box-shadow: -2px 3px 1px rgba(0, 0, 0, 0.23);
			opacity: 1;
			text-transform: uppercase;
			-webkit-transform: rotate(45deg) translateY(0);
			transform: rotate(45deg) translateY(0);
			-webkit-transition: background-color 0.2s ease-out, -webkit-transform 0.45s cubic-bezier(0.15, 0, 0, 1), opacity 0.2s ease-out;
			transition: background-color 0.2s ease-out, transform 0.45s cubic-bezier(0.15, 0, 0, 1), opacity 0.2s ease-out;
		}

		.github-fork.exit {
			opacity: 0;
			-webkit-transform: rotate(45deg) translateY(-170px);
			transform: rotate(45deg) translateY(-170px);
		}

		.github-fork:hover {
			background-color: #4b4b4b;
			color: #FFF
		}

		.github-fork:before,
		.github-fork:after {
			content: " ";
			background-image: url(data:image/svg+xml;base64,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);
			background-repeat: repeat-x;
			background-position: top left;
			position: absolute;
			z-index: 1;
			left: 0;
			width: 100%;
			height: 1px;
		}

		.github-fork:before {
			top: 3px;
		}

		.github-fork:after {
			bottom: 2px;
		}
	</style>
	<a href="/" target='_blank' class='github-fork'>Fork me on github!</a>
</template>
<script>
	(function (window, document, undefined) {
		var Icons = (function () {
			var icons = {
				"github": "M24.999,2.48c-12.75,0-23.087,10.338-23.087,23.09c0,10.199,6.613,18.854,15.791,21.907 c1.154,0.211,1.518-0.474,1.518-1.084c0-0.547,0.011-2.082,0-4.01c-6.422,1.398-7.753-3.038-7.753-3.038 c-1.048-2.671-2.562-3.377-2.562-3.377c-2.095-1.433,0.158-1.407,0.158-1.407c2.317,0.163,3.538,2.383,3.538,2.383 c2.059,3.522,5.403,2.505,6.717,1.916c0.21-1.491,0.808-2.51,1.468-3.087C15.66,35.188,10.27,33.211,10.27,24.361 c0-2.521,0.9-4.581,2.376-6.194c-0.239-0.584-1.031-2.932,0.226-6.112c0,0,1.939-0.62,6.349,2.369 c1.841-0.513,3.817-0.768,5.78-0.777c1.962,0.009,3.938,0.264,5.781,0.777c4.409-2.988,6.346-2.369,6.346-2.369 c1.258,3.18,0.466,5.528,0.229,6.112c1.478,1.613,2.373,3.673,2.373,6.194c0,8.872-5.397,10.823-10.543,11.392 c0.828,0.717,1.582,2.101,1.582,4.255c0,2.887,0,5.632,0,6.392c0,0.617,0.372,1.302,1.544,1.076 c9.167-3.059,15.776-11.708,15.776-21.905C48.089,12.818,37.75,2.48,24.999,2.48z"
			}

			function get(icon) {
				if (icons[icon]) {
					return '<svg class="i-svg" height="50" version="1.1" width="50" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid meet" viewBox="0 0 50 50" space="preserve" data-icon="facebook," class="i-svg"><desc>Created with Snap</desc><defs></defs><path d="' + icons[icon] + '" fill="#ffffff"></path></svg>';
				}
				return false;
			}
			return {
				get: get
			}
		})();

		function checkColor(el) {
			var color = el.getAttribute("color");
			if (typeof color === "string") {
				el.link.style.backgroundColor = color;
			}
		}

		function checkVisibility(el) {
			var hidden = el.getAttribute("hidden");
			if (hidden !== null && hidden !== undefined) {
				updateClass(el, "exit");
			}
		}

		function checkLink(el){
			var link = el.getAttribute("href") || el.getAttribute("url") || el.getAttribute("github") || "";
			if(typeof link === "string" && link.length){
				link = link.replace(/(http)(s)?(\:\/\/)(www\.)?(github.com)(\/)(.*)/i,"$7");
				el.link.href = "https://github.com/" + link;
			}
		}

		function events(el) {
			el.link.addEventListener("mouseleave", function (event) {});
			el.link.addEventListener("mousemove", function (event) {});
			el.link.addEventListener("mousedown", function (event) {});
			el.link.addEventListener("click", function (event) {});
		}

		function init(el) {
			var clone = mainDoc.importNode(template, true);
			el.shadow = el.createShadowRoot();
			el.shadow.appendChild(clone);
			el.time = null;
			el.link = el.shadow.querySelector('a');
			el.class = "github-fork";
		}

		function updateClass(el, name, action) {
			var reg = new RegExp(name, "i");
			if (!action) {
				if (!el.class.match(reg)) {
					el.class = el.class + " " + name;
				}
			} else {
				el.class = el.class.replace(reg, "");
				el.class = el.class.replace("[\s]*", " ").trim();
			}
			el.link.className = el.class;
		}
		var mainDoc = document,
			thisDoc = (mainDoc._currentScript || mainDoc.currentScript).ownerDocument,
			template = thisDoc.querySelector('template').content,
			element = Object.create(HTMLElement.prototype),
			event = new Event('action');
		element.createdCallback = function () {
			init(this);
			events(this);
			checkVisibility(this);
			checkLink(this);
		};
		element.attributeChangedCallback = function (attr, oldVal, newVal) {
			if(attr == "color"){
				checkColor(this);
			}
		};
		element.exit = function () {
			if (!this.class.match(/exit/)) {
				updateClass(this, "exit");
			}
		}
		element.enter = function () {
			if (this.class.match(/exit/)) {
				updateClass(this, "exit", 1);
			}
		}
		element.background = function (color){
			if(typeof color === "string"){
				color = "#" + color.replace("#","");
				this.setAttribute("color", color);
			}
		}
		mainDoc.registerElement('github-fork', {
			prototype: element
		});
	})(window, document);
</script>