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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title><h1></title>
</head>
<body>
<!-- is block -->
<h1 class="class" id="id" lang="en">text</h1>
<!-- can contain strictly inline -->
<h1>text <em>elem</em></h1>
<!-- can contain interactive -->
<h1><a>text</a></h1>
</body>
</html>