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chromium/third_party/blink/web_tests/external/wpt/css/selectors/has-matches-to-uninserted-elements.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Matches :has pseudo class to uninserted elements</title>
<link rel="author" title="Byungwoo Lee" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">

<script>
  // Test that |selector| returns matching status.
  function test_matches(node, selector, expected) {
    test(function() {
      assert_equals(node.matches(selector), expected);
    }, `${selector} matches expectedly`);
  }

  subject = document.createElement('subject');

  subject.innerHTML = '<child></child>';
  test_matches(subject, ':has(child)', true);
  test_matches(subject, ':has(> child)', true);

  subject.innerHTML = '<child><descendant></descendant></child>';
  test_matches(subject, ':has(descendant)', true);
  test_matches(subject, ':has(> descendant)', false);

  subject.innerHTML = '<child></child><direct_sibling></direct_sibling><indirect_sibling></indirect_sibling>';
  test_matches(subject.firstChild, ':has(~ direct_sibling)', true);
  test_matches(subject.firstChild, ':has(+ direct_sibling)', true);
  test_matches(subject.firstChild, ':has(~ indirect_sibling)', true);
  test_matches(subject.firstChild, ':has(+ indirect_sibling)', false);

  test_matches(subject, ':has(*)', true);
  test_matches(subject, ':has(> *)', true);
  test_matches(subject, ':has(~ *)', false);
  test_matches(subject, ':has(+ *)', false);
</script>