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

  <!-- is strictly inline -->
  <p><dfn><abbr title="text1" class="class" lang="en">text</abbr></dfn></p>

  <!-- can be empty -->
  <p>text <abbr title=''></abbr></p>
  <p>text <dfn><abbr title=''></abbr></dfn></p>

  <!-- can contain interactive -->
  <p><abbr title=''><a>text</a></abbr></p>
  <p><dfn><abbr title=''><a>text</a></abbr></dfn></p>

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