container-size-shadow-invalidation.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Container Queries Test: Invalidate size container query for Shadow DOM</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#query-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  .container {
    container-type: inline-size;
    width: 100px;
  }
  @container (width = 200px) {
    .target { color: green; }
  }
</style>
<div id="host_container" class="container">
  <template shadowrootmode="open">
    <div class="container">
      <slot></slot>
    </div>
  </template>
  <div class="target">Green</div>
</div>
<div id="non_host_container" class="container">
  <div>
    <template shadowrootmode="open">
      <div class="container">
        <slot></slot>
      </div>
    </template>
    <div class="target">Green</div>
  </div>
</div>
<script>
  setup(() => {
    assert_implements_container_queries();
  });

  const green = "rgb(0, 128, 0)";

  test(() => {
    document.body.offsetTop;
    host_container.style.width = "200px";
    assert_equals(getComputedStyle(document.querySelector("#host_container .target")).color, green);
  }, "Host container child invalidated with container in shadow tree");

  test(() => {
    document.body.offsetTop;
    non_host_container.style.width = "200px";
    assert_equals(getComputedStyle(document.querySelector("#non_host_container .target")).color, green);
  }, "Non-host container child invalidated with container in shadow tree");
</script>
chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/container-size-shadow-invalidation.html
