has-with-nth-child.html

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This WPT test may be referenced by the following Test IDs:
- /css/selectors/invalidation/has-with-nth-child.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>CSS Selectors Test: :has(:nth-child()) invalidation for sibling change</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<link rel="help" href="https://drafts.csswg.org/selectors/#relational">

<style>

  #test-container > div { background-color: green; }

  #target1:has(.item:nth-child(3)) { background-color: red; }

  #target2:has(.item:nth-last-child(3)) { background-color: red; }

  #target3:has(.item:nth-child(3) > .child) { background-color: red; }

  #target4:has(.item:nth-last-child(3) > .child) { background-color: red; }

</style>

<div id="test-container">

  <div id="target1">

    <div class="item" id="item1">FAIL if you see this text</div>

    <div class="item"></div>

    <div class="item">This text should have a green background</div>

  </div>

  <div id="target2">

    <div class="item">This text should have a green background</div>

    <div class="item"></div>

    <div class="item" id="item2">FAIL if you see this text</div>

  </div>

  <div id="target3">

    <div class="item" id="item3">FAIL if you see this text</div>

    <div class="item"></div>

    <div class="item">

      <span class="child">This text should have a green background<span>

    </div>

  </div>

  <div id="target4">

    <div class="item">

      <span class="child">This text should have a green background<span>

    </div>

    <div class="item"></div>

    <div class="item" id="item4">FAIL if you see this text</div>

  </div>

</div>

<script>

  test(() => {

    assert_equals(getComputedStyle(target1).backgroundColor, "rgb(255, 0, 0)");

    assert_equals(getComputedStyle(target2).backgroundColor, "rgb(255, 0, 0)");

    assert_equals(getComputedStyle(target3).backgroundColor, "rgb(255, 0, 0)");

    assert_equals(getComputedStyle(target4).backgroundColor, "rgb(255, 0, 0)");

  }, "Initially red");

  test(() => {

    item1.remove();

    assert_equals(getComputedStyle(target1).backgroundColor, "rgb(0, 128, 0)");

  }, ":nth-child() no longer matching after removal");

  test(() => {

    item2.remove();

    assert_equals(getComputedStyle(target2).backgroundColor, "rgb(0, 128, 0)");

  }, ":nth-last-child() no longer matching after removal");

  test(() => {

    item3.remove();

    assert_equals(getComputedStyle(target3).backgroundColor, "rgb(0, 128, 0)");

  }, ":nth-child() in non-subject no longer matching after removal");

  test(() => {

    item4.remove();

    assert_equals(getComputedStyle(target4).backgroundColor, "rgb(0, 128, 0)");

  }, ":nth-last-child() in non-subject no longer matching after removal");

</script>