model-isvalid.html

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<!DOCTYPE html>

<html>

<head>

  <meta charset=utf-8>

  <title>&lt;sup&gt;</title>

</head>

<body>

  <!-- is structured inline -->

  <p><sup class="class" lang="en">text</sup></p>

  <!-- is strictly inline -->

  <p><dfn><sup class="class" lang="en">text</sup></dfn></p>

  <!-- can be empty -->

  <p>text <sup></sup></p>

  <p>text <dfn><sup></sup></dfn></p>

  <!-- can contain interactive -->

  <p><sup><a>text</a></sup></p>

  <p><dfn><sup><a>text</a></sup></dfn></p>

  <!-- cannot contain structured inline -->

</body>

</html>