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Test Info:

<!doctype html>
<meta charset="utf-8">
<title>:host</title>
<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
<p>Test passes if there is a filled green square.</p>
<div id=host>
</div>
<script>
host.attachShadow({mode: "open"}).innerHTML = `
<style>
:host {
width: 100px;
height: 100px;
background-color: red;
}
:not(:not(:host)):host {
background-color: green;
}
</style>
`;
</script>