css/css-layout-api/baseline/child-baseline.https.html

<!DOCTYPE html>
<html class=reftest-wait>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#interaction-alignment">
<link rel="match" href="../green-square-ref.html">
<meta name="assert" content="This test checks that passing child baseline to a parent works correctly." />
<style>
.test {
  background: green;
  padding: 0 10px;
  width: 80px;
}

@supports (display: layout(parent)) {
  .test {
    display: layout(parent);
    background: green;
  }

  .child {
    display: layout(child);
  }
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>

<div class="test">
  <div class="child"></div>
</div>

<script id="code" type="text/worklet">
const BASELINE = 10;

registerLayout('parent', class {
  async intrinsicSizes() {}
  async layout(children) {
    const childFragments = await Promise.all(children.map(child => child.layoutNextFragment({})));

    if (childFragments[0].baseline != BASELINE)
      return {autoBlockSize: 0, childFragments};

    return {autoBlockSize: 100, childFragments};
  }
});

registerLayout('child', class {
  async intrinsicSizes() {}
  async layout(children) {
    const childFragments = await Promise.all(children.map(child => child.layoutNextFragment({})));
    return { childFragments, baseline: BASELINE }
  }
});
</script>

<script>
importWorkletAndTerminateTestAfterAsyncPaint(CSS.layoutWorklet, document.getElementById('code').textContent);
</script>
</html>