Vanilla JavaScript Google's MaterialDesign-like loading modal
<!-- include material lite libs -->
<link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.indigo-pink.min.css">
<script defer src="https://code.getmdl.io/1.3.0/material.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.rawgit.com/fechanique/material-loading/master/material-loading.css">
<script src="https://cdn.rawgit.com/fechanique/material-loading/master/material-loading.js"></script>materialLoading(true)
materialLoading(false)
<html>
<head>
<link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.indigo-pink.min.css">
<script defer src="https://code.getmdl.io/1.3.0/material.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.rawgit.com/fechanique/material-loading/master/material-loading.css">
<script src="https://cdn.rawgit.com/fechanique/material-loading/master/material-loading.js"></script>
</head>
<body>
<button onclick="materialLoading(true);setTimeout(function(){materialLoading(false)},3000)">Open loading modal</button>
</body>
</html>