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chromium/third_party/blink/web_tests/external/wpt/css/selectors/parsing/parse-part.html 

<!doctype html>
<meta charset="utf-8" />
<title>CSS Selectors: part pseudo selectors</title>
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#part" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  test_valid_selector("::part(--foo)");
  test_valid_selector("::part(bar)");
  test_valid_selector("::part(--)");
  test_valid_selector("::part(--0)");
  test_valid_selector("::part(foo bar)");
  test_valid_selector("::part(-foo bar)");
  test_valid_selector("::part(foo):focus");
  test_valid_selector("::part(foo):hover");
  test_valid_selector("::part(foo):focus-within");
  test_valid_selector("::part(foo)::before");
  test_valid_selector("::part(foo)::after");
  test_valid_selector("::part(foo)::placeholder");
  test_valid_selector("::part(foo)::first-line");
  test_valid_selector("::part(foo)::first-letter");
  test_valid_selector("::part(foo)::file-selector-button");
  test_valid_selector("::part(foo):is(:focus)");
  test_valid_selector(":lang(en)::part(foo)");
  test_valid_selector(":dir(ltr)::part(foo)");
  test_valid_selector("::part(foo):lang(en)");
  test_valid_selector("::part(foo):dir(ltr)");
  test_valid_selector("::part(foo):disabled");
  test_valid_selector("::part(foo):checked");
  test_invalid_selector(":part()");
  test_invalid_selector(":part(0)");
  test_invalid_selector(":part('foo')");
  test_invalid_selector(":part([foo])");
  test_invalid_selector('::part(foo) + ::part(bar)');
  // Note: the serialization behavior of the following is as resolved in
  // https://github.com/w3c/csswg-drafts/issues/8356 but it has not yet been
  // specified.
  test_valid_forgiving_selector("::part(foo):is(ul)");
  test_valid_forgiving_selector("::part(foo):is(nav ul)");
  test_valid_forgiving_selector("::part(foo):where(ul)");
  test_valid_forgiving_selector("::part(foo):where(nav ul)");
  test_invalid_selector("::part(foo):has(li)");
</script>