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chromium/third_party/blink/web_tests/external/wpt/html/semantics/document-metadata/the-meta-element/color-scheme/meta-color-scheme-single-value-in-shadow-tree.html 

<!doctype html>
<title>Meta color-scheme in shadow-tree should not apply</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/semantics.html#meta-color-scheme">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/compute-root-color-scheme.js"></script>
<!--
  NOTE: This test assumes that the browser's default color-scheme is "light",
  see https://github.com/web-platform-tests/wpt/pull/31268 for reasoning
-->
<script>
  const host = document.createElement("div");
  host.id = "host";
  document.head.appendChild(host);
  const root = host.attachShadow({mode:"open"});
  const meta = document.createElement("meta");
  meta.setAttribute("name", "color-scheme");
  meta.setAttribute("content", "dark");
  root.appendChild(meta);

  assert_root_color_scheme("light", "Meta color-scheme in shadow tree does not apply.");
</script>