Try it Editor: html5_link

Edit This Code :

<!DOCTYPE html>
<html>
<head>
  <link rel="icon" href="demo_icon.gif" type="image/gif" sizes="16x16">
</head>
<body>

<h2>
Hello world!</h2>
<p>
Open this page in a <a href="link-tag.html" target="_blank">new window</a> to see the favicon.</p>
<p>
<b>Note:</b> The sizes attribute is not currently supported in any of the major browsers.</p>

</body>
</html>

Result :

html5_link_sizes