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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title><sub></title>
</head>
<body>
<!-- not a block -->
<sub>text</sub>
<!-- cannot contain structured inline -->
<p><sub><ul><li>text</li></ul></sub></p>
<!-- cannot contain interactive if parent forbids interactive -->
<p><a><sub><a>text</a></sub></a></p>
<p><a><dfn><sub><a>text</a></sub></dfn></a></p>
</body>
</html>