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

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

  <!-- must be empty -->
</body>
</html>