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

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selectors: The relational pseudo-class (forgiving selector parsing)</title>
<link rel="author" title="Steinar H. Gunderson" href="mailto:[email protected]">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/8356">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  // disallow nesting :has() inside :has(), but serialize back unchanged
  test_valid_forgiving_selector(':has(:is(:has(*)))');
  test_valid_forgiving_selector(':has(:where(:has(*)))');
  // serialize :is() back unchanged
  test_valid_forgiving_selector(':has(:is(.a, 123))');
</script>