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

<main>
 <div id=d01 class="a">
  <div id=scope1 class="b">
    <div id=d02 class="c">
      <div id=d03 class="c">
        <div id=d04 class="d"></div>
      </div>
    </div>
    <div id=d05 class="e"></div>
  </div>
 </div>
 <div id=d06>
  <div id=scope2 class="b">
    <div id=d07 class="c">
      <div id=d08 class="c">
        <div id=d09></div>
      </div>
    </div>
  </div>
 </div>
</div>

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

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

  // Test that |selector1| and |selector2| returns same elements in the given scope element
  function compare_selector_all(scope, selector1, selector2) {
    test(function() {
      let result1 = Array.from(scope.querySelectorAll(selector1));
      let result2 = Array.from(scope.querySelectorAll(selector2));
      assert_equals(formatElements(result1), formatElements(result2));
    }, `${selector1} and ${selector2} returns same elements on ${scope.id}`);
  }

  // descendants of a scope element cannot have the scope element as its descendant
  test_selector_all(scope1, ':has(:scope)', []);
  test_selector_all(scope1, ':has(:scope .c)', []);
  test_selector_all(scope1, ':has(.a :scope)', []);

  // there can be more simple and efficient alternative for a ':scope' in ':has'
  test_selector_all(scope1, '.a:has(:scope) .c', [d02, d03]);
  compare_selector_all(scope1, '.a:has(:scope) .c', ':is(.a :scope .c)');
  test_selector_all(scope2, '.a:has(:scope) .c', []);
  compare_selector_all(scope2, '.a:has(:scope) .c', ':is(.a :scope .c)');
  test_selector_all(scope1, '.c:has(:is(:scope .d))', [d02, d03]);
  compare_selector_all(scope1, '.c:has(:is(:scope .d))', ':scope .c:has(.d)');
  compare_selector_all(scope1, '.c:has(:is(:scope .d))', '.c:has(.d)');
  test_selector_all(scope2, '.c:has(:is(:scope .d))', []);
  compare_selector_all(scope2, '.c:has(:is(:scope .d))', ':scope .c:has(.d)');
  compare_selector_all(scope2, '.c:has(:is(:scope .d))', '.c:has(.d)');
</script>