wpt/css/css-layout-api/fallback-layout/no-promise.https.html at 80343da59bc052d363edd808b5755ec7aab36414 · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html class=reftest-wait>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#invoke-a-layout-callback">
<link rel="match" href="fallback-layout-fallback-ref.html">
<meta name="assert" content="This test checks that a layout() class with a layout function that doesn't return a promise will fallback to block layout." />
<style>
.test {
  background: red;
  border: solid 2px;
  width: 100px;
}

.child {
  height: 100px;
}

@supports (display: layout(no-promise)) {
  .test {
    display: layout(no-promise);
    background: green;
  }
}
</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">
registerLayout('no-promise', class {
  async intrinsicSizes() {}
  layout() { return {autoBlockSize: 50}; }
});
</script>

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