<!doctype html> <title>CSS Test: <link rel="stylesheet"> in Shadow DOM</title> <link rel="help" href="https://html.spec.whatwg.org/#link-type-stylesheet"> <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">FAIL</div> <script> host.attachShadow({ mode: "open" }).innerHTML = ` <link rel="stylesheet" href="resources/host-green-box.css"> `; </script>