<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <link rel="author" title="L. David Baron" href="https://dbaron.org/"/>
  <link rel="author" title="Mozilla" href="http://mozilla.org/"/>
  <title>CSS Namespaces Test Suite reference</title>
 </head>
 <body>
  <p style="background: lime">This sentence should have a green background.</p>
 </body>
</html>