File: scroll-state-initially-stuck.html

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<!DOCTYPE html>
<title>@container: scroll-state(stuck) matching for initial rendering</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule">
<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>
  #filler {
    height: 10000px;
  }
  #stuck {
    container-name: initially-stuck;
    container-type: scroll-state;
    position: sticky;
    bottom: 0;
  }

  @container initially-stuck scroll-state(stuck: bottom) {
    span { --stuck: yes }
  }
</style>
<div id="filler"></div>
<div id="stuck">
  <span id="target">My container is stuck</span>
</div>
<script>
  setup(() => assert_implements_scroll_state_container_queries());

  promise_test(async t => {
    await waitForAnimationFrames(2);
    assert_equals(getComputedStyle(target).getPropertyValue("--stuck"), "yes");
  }, "Check that scroll-state(stuck: bottom) matches");
</script>