css/css-layout-api/layout-child-before-after.https.html

<!DOCTYPE html>
<html class=reftest-wait>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#layout-children">
<link rel="match" href="green-square-ref.html">
<meta name="assert" content="This test checks that boxes created by ::before/::after appear as children." />

<style>
.test {
  --child-expected: ["1", "2", "3"];

  background: red;
  width: 100px;
}

.test::before {
  visibility: hidden;
  content: 'before';
  --child: 1;
}

.inflow {
  visibility: hidden;
  --child: 2;
}

.test::after {
  visibility: hidden;
  content: 'after';
  --child: 3;
}

@supports (display: layout(test)) {
  .test {
    background: green;
    display: layout(test);
  }
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>

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

<script>
importWorkletAndTerminateTestAfterAsyncPaint(CSS.layoutWorklet, {url: 'support/layout-child-worklet.js'});
</script>