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Test Info:

<!doctype html>
<link rel="author" title="Emilio Cobos Álvarez" 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>
<div id="host"></div>
<script>
let root = host.attachShadow({ mode: "open" });
root.innerHTML = `
<style>
:host { width: 100px; height: 100px; background: green; }
* :host { background: red; }
</style>
`;
</script>