pseudo-elements-004.html | Explore in Territory

<!doctype html>
<title>@container: originating element container for pseudo elements</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-queries">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #target { container-type: inline-size; }
  #target::before,
  #target::after,
  #target::marker,
  #target::first-line,
  #target::first-letter,
  #target::backdrop {
    color: red;
  }
  @container (width >= 300px) {
    #target::before,
    #target::after,
    #target::marker,
    #target::first-line,
    #target::first-letter,
    #target::backdrop {
      color: green;
    }
  }
</style>
<div id="outer" style="width: 200px">
  <div id="target"></div>
</div>
<script>
  setup(() => assert_implements_container_queries());

  const green = "rgb(0, 128, 0)";
  const red = "rgb(255, 0, 0)";

  const pseudo_elements = ["::before", "::after", "::marker", "::first-line", "::first-letter", "::backdrop"];

  pseudo_elements.forEach((pseudo_element) => {
    test(() => {
      assert_equals(getComputedStyle(target, pseudo_element).color, red);
    }, `Initial color for ${pseudo_element}`);
  });

  outer.style.width = "300px";

  pseudo_elements.forEach((pseudo_element) => {
    test(() => {
      assert_equals(getComputedStyle(target, pseudo_element).color, green);
    }, `Color for ${pseudo_element} depending on container`);
  });
</script>
chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/pseudo-elements-004.html
