css/css-layout-api/auto-block-size-absolute.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-absolute-ref.html">
<meta name="assert" content="This test checks that the absolute positioning respects the auto-block-size." />

<style>
.test {
  position: absolute;
  background: red;
}

@supports (display: layout(block-size-100)) {
  .test {
    display: layout(block-size-100);
    background: green;
  }
}

.container {
  position: relative;
  margin: 20px 0;
  width: 200px;
  height: 200px;
  border: solid 2px;
}

.width-100 {
  width: 100px;
  writing-mode: horizontal-tb;
}

.height-100 {
  height: 100px;
  writing-mode: vertical-rl;
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>

<!-- 100px x 100px, bottom-left -->
<div class="container">
  <div class="test width-100" style="bottom: 0px"></div>
</div>

<!-- 100px x 200px, left, auto-size is ignored. -->
<div class="container">
  <div class="test width-100" style="top: 0px; bottom: 0px"></div>
</div>

<!-- 100px x 100px, top-left -->
<div class="container">
  <div class="test height-100" style="left: 0px;"></div>
</div>

<!-- 100px x 100px, top, auto-size is ignored. -->
<div class="container">
  <div class="test height-100" style="left: 0px; right: 0px;"></div>
</div>

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

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