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chromium/third_party/blink/web_tests/external/wpt/css/css-layout-api/child-constraints/fixed-block-size.https.html 

<!DOCTYPE html>
<html class=reftest-wait>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#dom-layoutconstraintsoptions-fixedblocksize">
<link rel="match" href="../green-square-ref.html">
<meta name="assert" content="This test checks that fixing the block size of children works as expected." />

<style>
.test {
  background: red;
  width: 100px;
}

.htb {
  writing-mode: horizontal-tb;
  visibility: hidden;
  width: 3px;
  height: 2px;

  --fixed-block-size: 10;

  --inline-size-expected: 3;
  --block-size-expected: 10;
}

.vrl {
  writing-mode: vertical-rl;
  visibility: hidden;
  width: 3px;
  height: 2px;

  --fixed-block-size: 10;

  --inline-size-expected: 3;
  --block-size-expected: 10;
}

@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="htb"></div>
  <div class="vrl"></div>
  <!-- min/max-height should have no effect, fixedBlockSize wins. -->
  <div class="htb" style="max-height: 5px;"></div>
  <div class="vrl" style="max-height: 5px;"></div>
  <div class="htb" style="min-height: 15px;"></div>
  <div class="vrl" style="min-height: 15px;"></div>
</div>

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