wpt/css/css-conditional/container-queries/pseudo-elements-007.html at master · web-platform-tests/wpt · GitHub

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<!doctype html>
<title>@container: originating element container for pseudo elements</title>
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/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 {
    font-size: 0px;
  }
  @container (width >= 300px) {
    #target::before,
    #target::after,
    #target::marker,
    #target::first-line,
    #target::first-letter,
    #target::backdrop {
      font-size: 10cqw;
    }
  }
</style>
<div id="outer" style="width: 200px">
  <div id="target"></div>
</div>
<script>
  setup(() => assert_implements_size_container_queries());

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

  pseudo_elements.forEach((pseudo_element) => {
    test(() => {
      assert_equals(getComputedStyle(target, pseudo_element).fontSize, "0px");
    }, `Initial font-size for ${pseudo_element}`);
  });

  outer.style.width = "300px";

  pseudo_elements.forEach((pseudo_element) => {
    test(() => {
      assert_equals(getComputedStyle(target, pseudo_element).fontSize, "30px");
    }, `font-size for ${pseudo_element} depending on container`);
  });
</script>