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Test Info:

<!doctype html>
<title>CSS Scoping Module Level 1 - Dynamic insertion of shadow host</title>
<link rel="author" href="mailto:emilio@crisal.io">
<link rel="match" href="reference/green-box.html"/>
<p>Test passes if you see a single 100px by 100px green box below.</p>
<script>
let host = document.createElement('div');
let root = host.attachShadow({ mode: 'open' });
root.innerHTML = `
<style>
div { background: green; width: 100px; height: 100px; }
</style>
<div></div>
`;
document.body.offsetTop;
document.body.appendChild(host);
</script>