File: animation-nested-transition.html

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<!doctype html>
<title>Container Queries - Animated container with inner transition</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#animated-containers">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  @keyframes outer {
    from { width: 100px; }
    to { width: 300px; }
  }
  #container {
    container-type: inline-size;
    animation: outer 1s linear paused;
  }
  #target {
    background-color: rgb(100, 100, 100);
  }

  @container (min-width: 200px) {
    #target {
      transition: background-color 100s steps(2, start);
      background-color: rgb(200, 200, 200);
    }
  }
</style>
<div id=container>
  <div id=target>
    Test
  </div>
</div>
<script>
  setup(() => assert_implements_container_queries());

  test(() => {
    assert_equals(getComputedStyle(target).backgroundColor, 'rgb(100, 100, 100)');

    assert_equals(container.getAnimations().length, 1);
    let animation = container.getAnimations()[0];
    animation.currentTime = 600;

    assert_equals(getComputedStyle(target).backgroundColor, 'rgb(150, 150, 150)');
  }, 'Animated container size triggers transition');
</script>