<!doctype html>
<html class="no-js" lang="">

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Material UI</title>
  <meta name="description" content="Google's material design UI components built with React.">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" type="text/css" href="main.css">
</head>

<body>
	<script>
		var WebfontConfig = {
			google: { families: [ 'Roboto:400,500:latin,cyrillic' ] }
		};
		(function() {
			var wf = document.createElement('script');
			wf.src = ('https:' == document.location.protocol ? 'https' : 'http') +
			'://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';
			wf.type = 'text/javascript';
			wf.async = 'true';
			var s = document.getElementsByTagName('script')[0];
			s.parentNode.insertBefore(wf, s);
		})();
	</script>
  <script src="app.js"></script>
</body>

</html>

<!doctype html>
<html class="no-js" lang="">

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Material UI</title>
  <meta name="description" content="Google's material design UI components built with React.">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" type="text/css" href="main.css">
</head>

<body>
	<script>
		var WebfontConfig = {
			google: { families: [ 'Roboto:400,300,500:latin' ] }
		};
		(function() {
			var wf = document.createElement('script');
			wf.src = ('https:' == document.location.protocol ? 'https' : 'http') +
			'://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';
			wf.type = 'text/javascript';
			wf.async = 'true';
			var s = document.getElementsByTagName('script')[0];
			s.parentNode.insertBefore(wf, s);
		})();
	</script>
  <script src="app.js"></script>
</body>

</html>

Change based on suggestion from @hai-cea
Change based on suggestion from @hai-cea
