chromium/third_party/blink/web_tests/external/wpt/html/dom/elements/global-attributes/translate-inherit-no-parent-element.html

<!doctype html>
<meta charset=utf-8>
<title>The translate attribute inherit state when there's no parent element</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
  const div = document.createElement("div");
  assert_true(div.translate);
}, 'No parent node');

test(() => {
  const div = document.createElement("div");
  const frag = document.createDocumentFragment();
  frag.append(div);
  assert_true(div.translate);
}, 'DocumentFragment parent node');

for (const translateValue of ['yes', 'no']) {
  test(() => {
    const div = document.createElement("div");
    const myElement = document.createElement("my-element");
    myElement.setAttribute('translate', translateValue);
    myElement.attachShadow({mode: 'open'});
    myElement.shadowRoot.append(div);
    assert_true(div.translate);
  }, `ShadowRoot parent node whose shadow host has translate=${translateValue}`);
}

test(() => {
  assert_true(document.documentElement.translate);
}, 'Document parent node');
</script>