Try it Editor: html_meta

Edit This Code :



<!DOCTYPE html>
<html>
<head>
  <meta name="date" content="2009-01-02" scheme="YYYY-MM-DD">
  <meta name="identifier" content="0-2345-6634-6" scheme="ISBN">
</head>
<body>

<p>The meta shcheme attribute is not supported in HTML5.</p>

</body>
</html>

Result :

html_meta_scheme