css/css-layout-api/auto-block-size-flex.https.html

<!DOCTYPE html>
<html class=reftest-wait>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#interaction-sizing">
<link rel="match" href="auto-block-size-flex-ref.html">
<meta name="assert" content="This test checks that the flex layout respects the auto-block-size." />

<style>
.flex {
  width: 300px;
  display: flex;
  border: solid 2px;
}

.custom {
  background: red;
  box-sizing: border-box;
  border: solid 2px;
  height: 100px;
  writing-mode: vertical-rl;
}

@supports (display: layout(block-size-100)) {
  .custom-100 {
    display: layout(block-size-100);
    background: green;
  }
  .custom-50 {
    display: layout(block-size-50);
    background: green;
    flex: 1;
  }
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>

<!-- Tests that floats using an auto block size get positioned correctly. -->
<div class="flex">
  <div class="custom custom-100"></div>
  <div class="custom custom-50"></div>
</div>

<script id="code" type="text/worklet">
registerLayout('block-size-100', class {
  *intrinsicSizes() {}
  *layout() {
    return {autoBlockSize: 100};
  }
});
registerLayout('block-size-50', class {
  *intrinsicSizes() {}
  *layout() {
    return {autoBlockSize: 50};
  }
});
</script>

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