<!DOCTYPE html>
<html>
<head>
  <meta charset=utf-8>
  <title>&lt;abbr&gt;</title>
</head>
<body>
  <!-- not a block -->
  <abbr>text</abbr>

  <!-- cannot contain structured inline -->
  <p><abbr><ul><li>text</li></ul></abbr></p>

  <!-- cannot contain interactive if parent forbids interactive -->
  <p><a><abbr><a>text</a></abbr></a></p>
  <p><a><dfn><abbr><a>text</a></abbr></dfn></a></p>
</body>
</html>