wpt/css/selectors/invalidation/has-invalidation-for-wiping-an-element.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>:has() invalidation for wiping an element by means of innerHTML</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://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/selectors/#relational">
<style>
div, main { color: grey }
.subject:has(.descendant) { color: green}
</style>
<main id=main>
  <div id="subject" class="subject"></div>
</main>
<script>
  let grey = 'rgb(128, 128, 128)';
  let green = 'rgb(0, 128, 0)';

  function test_div(test_name, el, color) {
    test(function() {
      assert_equals(getComputedStyle(el).color, color);
    }, test_name + ': div#' + el.id + '.color');
  }

  test_div('initial color', subject, grey);

  subject.innerHTML = "This is a text <div><div class='descendant'></div></div>";

  test_div('color after inserting text and div > .descendant', subject, green);

  subject.innerHTML = "This is a text";

  test_div('color after wiping #child to remove div > .descendant', subject, grey);

  subject.innerHTML = "<div id='child'> This is a text <div class='descendant'></div></div>";

  test_div('color after inserting text and #child > .descendant', subject, green);

  child.innerHTML = "This is a text";

  test_div('color after wiping #child to remove .descendant', subject, grey);
</script>