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