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

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selectors: ID selectors</title>
<link rel="help" href="https://drafts.csswg.org/selectors-3/#id-selectors">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  test_valid_selector('h1#chapter1');
  test_valid_selector('#chapter1');
  test_valid_selector('*#z98y',
      ['*#z98y', '#z98y']);
</script>