<!DOCTYPE html>
<html>
<head>
  <meta charset=utf-8>
  <title>&lt;dfn&gt;</title>
</head>
<body>
  <!-- is structured inline -->
  <p><dfn class="class" lang="en" title="text1">text</dfn></p>

  <!-- is strictly inline -->
  <p><i><dfn class="class" lang="en">text2</dfn></i></p>

  <!-- can be empty -->
  <p>text <dfn></dfn></p>
  <p>text <i><dfn title="text3"></dfn></i></p>

  <!-- can contain interactive -->
  <p><dfn><a>text4</a></dfn></p>
  <p><i><dfn><a>text5</a></dfn></i></p>

  <!-- cannot contain structured inline -->
</body>
</html>