wpt/css/css-conditional/container-queries/scroll-state/scroll-state-scrollable-pseudo.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>@container: scroll-state(scrollable) for pseudo element</title>
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/css-conditional-5/#scrollable">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
  #scroller {
    container-type: scroll-state;
    overflow: auto;
    width: 100px;
    height: 100px;
  }
  #wrapper {
    width: 10px;
    height: 10px;
  }
  #wrapper.large {
    width: 75px;
    height: 75px;
  }
  #target {
    width: 200%;
    height: 200%;
    --before: no;
    --after: no;
    @container scroll-state(scrollable) {
      &::before {
        --before: yes;
        content: " ";
      }
      &::after {
        --after: yes;
      }
    }
  }
</style>
<div id="scroller">
  <div id="wrapper">
    <div id="target"></div>
  </div>
</div>
<script>
  setup(() => assert_implements_scroll_state_container_queries());

  promise_test(async t => {
    await waitForAnimationFrames(2);
    assert_equals(getComputedStyle(target, "::before").getPropertyValue("--before"), "no");
    assert_equals(getComputedStyle(target, "::after").getPropertyValue("--after"), "no");
  }, "::before/::after initially not matching");

  promise_test(async t => {
    wrapper.className = "large";
    await waitForAnimationFrames(2);
    assert_equals(getComputedStyle(target, "::before").getPropertyValue("--before"), "yes");
    assert_equals(getComputedStyle(target, "::after").getPropertyValue("--after"), "yes");
  }, "::before/::after matching after content starts scrollable #scroller");

</script>