css/css-layout-api/layout-child-inlines.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 inline children are correctly blockified or wrapped in anonymous boxes." />

<style>
/* We have a wrapper in this test to ensure that any text that is positioned
 * slightly outside the "test" box doesn't affect the rendering.
 * This wrapper has a 10px inline padding which does the trick. */
.wrapper {
  background: green;
  padding: 0 10px;
  width: 80px;
}

.test {
  --child-expected: ["1", "default", "3", "4", "5"];

  background: red;
  color: green;
  width: 80px;
  --child: default;
}

.inflow {
  visibility: hidden;
  --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="wrapper">
  <div class="test">
    <span style="--child: 1;">Text,</span> more text
    <div class="inflow"></div>
    <span style="--child: 4;">Text,
       <div>block!</div>
    </span>
    <span style="--child: 5;">Other text</span>
  </div>
</div>

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