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Test Info:

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: :host ignores default namespace</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" href="https://bugzil.la/1546375">
<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>
document.getElementById("host").attachShadow({ mode: "open" }).innerHTML = `
<style>
@namespace url(http://www.w3.org/2000/svg);
:host { background-color: green; width: 100px; height: 100px; }
</style>
`;
</script>