toolkit/components/extensions/test/xpcshell/data/file_shadowdom.html


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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<div id="host">host</div>
<script>
  "use strict";
  document.getElementById("host").attachShadow({mode: "closed"});
</script>
</body>
</html>