css/selectors/has-basic.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Basic matching behavior of :has pseudo class</title>
<link rel="author" title="Byungwoo Lee" href="mailto:blee@igalia.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">

<main id=main>
  <div id=a class="ancestor">
    <div id=b class="parent ancestor">
      <div id=c class="sibling descendant">
        <div id=d class="descendant"></div>
      </div>
      <div id=e class="target descendant"></div>
    </div>
    <div id=f class="parent ancestor">
      <div id=g class="target descendant"></div>
    </div>
    <div id=h class="parent ancestor">
      <div id=i class="target descendant"></div>
      <div id=j class="sibling descendant">
        <div id=k class="descendant"></div>
      </div>
    </div>
  </div>
</main>

<script>
  function formatElements(elements) {
    return elements.map(e => e.id).sort().join();
  }

  // Test that |selector| returns the given elements in #main.
  function test_selector_all(selector, expected) {
    test(function() {
      let actual = Array.from(main.querySelectorAll(selector));
      assert_equals(formatElements(actual), formatElements(expected));
    }, `${selector} matches expected elements`);
  }

  // Test that |selector| returns the given element in #main.
  function test_selector(selector, expected) {
    test(function() {
      assert_equals(main.querySelector(selector), expected);
    }, `${selector} matches expected element`);
  }

  // Test that |selector| returns the given closest element.
  function test_closest(node, selector, expected) {
    test(function() {
      assert_equals(node.closest(selector), expected);
    }, `closest(${selector}) returns expected element`);
  }

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

  test_selector_all(':has(#a)', []);
  test_selector_all(':has(.ancestor)', [a]);
  test_selector_all(':has(.target)', [a, b, f, h]);
  test_selector_all(':has(.descendant)', [a, b, c, f, h, j]);
  test_selector_all('.parent:has(.target)', [b, f, h]);
  test_selector_all(':has(.sibling ~ .target)', [a, b]);
  test_selector_all('.parent:has(.sibling ~ .target)', [b]);
  test_selector_all(':has(:is(.target ~ .sibling .descendant))', [a, h, j]);
  test_selector_all('.parent:has(:is(.target ~ .sibling .descendant))', [h]);
  test_selector_all('.sibling:has(.descendant) ~ .target', [e]);
  test_selector_all(':has(.sibling:has(.descendant) ~ .target)', [a, b]);
  test_selector_all(
      ':has(.sibling:has(.descendant) ~ .target) ~ .parent > .descendant',
      [g, i, j]);
  test_selector_all(':has(> .parent)', [a]);
  test_selector_all(':has(> .target)', [b, f, h]);
  test_selector_all(':has(> .parent, > .target)', [a, b, f, h]);
  test_selector_all(':has(+ #h)', [f]);
  test_selector_all('.parent:has(~ #h)', [b, f]);
  test_selector('.sibling:has(.descendant)', c);
  test_closest(k, '.ancestor:has(.descendant)', h);
  test_matches(h, ':has(.target ~ .sibling .descendant)', true);
</script>