File: anchored-child-transition.html

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<!DOCTYPE html>
<title>CSS Anchor Positioning Test: Transition on anchored element child with anchored() query</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #anchor {
    anchor-name: --a;
  }
  #container {
    container-type: anchored;
    position: absolute;
    position-anchor: --a;
    position-area: top;
    position-try-fallbacks: flip-block;
  }
  #child {
    scale: 1;
  }
  #child.large {
    scale: 2;
  }
  @container anchored(fallback: flip-block) {
    #child {
      transition: scale 1000s steps(2, start);
    }
  }
</style>
<div id="anchor"></div>
<div id="container">
  <div id="child"></div>
</div>
<script>
  test(() => {
    assert_equals(getComputedStyle(child).scale, "1");
  }, "Initial scale is 1");

  test(() => {
    container.style.height = "200px"; // Trigger fallback which sets the transition property
    child.classList.toggle("large"); // Trigger scale transition
    assert_equals(getComputedStyle(child).scale, "1.5");
  }, "Start transition of scale property on anchored child");
</script>