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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title><sub></title>
</head>
<body>
<!-- is structured inline -->
<p><sub class="class" lang="en">text</sub></p>
<!-- is strictly inline -->
<p><dfn><sub class="class" lang="en">text</sub></dfn></p>
<!-- can be empty -->
<p>text <sub></sub></p>
<p>text <dfn><sub></sub></dfn></p>
<!-- can contain interactive -->
<p><sub><a>text</a></sub></p>
<p><dfn><sub><a>text</a></sub></dfn></p>
<!-- cannot contain structured inline -->
</body>
</html>