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chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/highlight-pseudo-parsing.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS ::highlight Pseudo-Element Test: ::highlight selector parsing</title>
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  const pseudo = "::highlight(foo)";
  test_valid_selector(pseudo);
  test_valid_selector(`.a${pseudo}`);
  test_valid_selector(`div ${pseudo}`);
  test_valid_selector(`::part(my-part)${pseudo}`);

  test_invalid_selector("::highlight");
  test_invalid_selector(`::before${pseudo}`);
  test_invalid_selector(`${pseudo}.a`);
  test_invalid_selector(`${pseudo} div`);
  test_invalid_selector(`${pseudo}::after`);
  test_invalid_selector(`${pseudo}:hover`);
  test_invalid_selector(`:not(${pseudo})`);
</script>