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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/controlsList.tentative.html 

<!DOCTYPE html>
<title>Test controlsList attribute</title>
<link rel="help" href="https://github.com/whatwg/html/pull/6715">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const allowedValues = [
  "nodownload",
  "nofullscreen",
  "noplaybackrate",
  "noremoteplayback",
];

function testControlsList(tagName) {
  const element = document.createElement(tagName);

  // Test that supports() is returning true for allowed values.
  for (const value of allowedValues) {
    assert_true(
      element.controlsList.supports(value),
      `tag = ${element.tagName}, value = ${value} must be supported`
    );
  }
}

["audio", "video"].forEach((tagName) => {
  test(
    () => testControlsList(tagName),
    `Test controlsList allowed values for <${tagName}>`
  );
});
</script>