css/css-scoping/stylesheet-title-001.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: title attribute in stylesheets not in the document tree is ignored</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" href="https://drafts.csswg.org/cssom/#preferred-css-style-sheet-set-name">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-style-title">
<link rel="help" href="https://github.com/w3c/webcomponents/issues/535">
<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>
  host.attachShadow({ mode: "open" }).innerHTML = `
    <style>
      div { width: 100px; height: 100px; }
    </style>
    <style title="Foo">
      div { background: purple }
    </style>
    <style title="Bar">
      div { background: green }
    </style>
    <div></div>
  `;
</script>