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

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selectors: The relational pseudo-class</title>
<link rel="author" title="Byungwoo Lee" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#has-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  test_valid_selector(':has(a)');
  test_valid_selector(':has(#a)');
  test_valid_selector(':has(.a)');
  test_valid_selector(':has([a])');
  test_valid_selector(':has([a="b"])');
  test_valid_selector(':has([a|="b"])');
  test_valid_selector(':has(:hover)');
  test_valid_selector('*:has(.a)', ['*:has(.a)', ':has(.a)']);
  test_valid_selector('.a:has(.b)');
  test_valid_selector('.a:has(> .b)');
  test_valid_selector('.a:has(~ .b)');
  test_valid_selector('.a:has(+ .b)');
  test_valid_selector('.a:has(.b) .c');
  test_valid_selector('.a .b:has(.c)');
  test_valid_selector('.a .b:has(.c .d)');
  test_valid_selector('.a .b:has(.c .d) .e');
  test_valid_selector('.a:has(.b:is(.c .d))');
  test_valid_selector('.a:is(.b:has(.c) .d)');
  test_valid_selector('.a:not(:has(.b))');
  test_valid_selector('.a:has(:not(.b))');
  test_valid_selector('.a:has(.b):has(.c)');
  test_valid_selector('*|*:has(*)', ':has(*)');
  test_valid_selector(':has(*|*)', ':has(*)');
  test_invalid_selector(':has');
  test_invalid_selector('.a:has');
  test_invalid_selector('.a:has b');
  /* :has() is unforgiving, but :is() can still forgive */
  test_invalid_selector(':has()');
  test_invalid_selector(':has(123)');
  test_invalid_selector(':has(.a, 123)');
</script>