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

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

<style>
.test {
  writing-mode: horizontal-tb;
  background: red;
  width: 100px;
}

.child {
  writing-mode: horizontal-tb;
  visibility: hidden;
  width: 10px;

  --percentage-block-size: 20;

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

@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">
  <!-- A fixed height shouldn't be affected by the percentage size. -->
  <div class="child" style="height: 10px;"></div>

  <!-- A percentage height should resolve itself against the percentageBlockSize. -->
  <div class="child" style="height: 50%;"></div>

  <!-- A percentage max-height should resolve itself against the percentageBlockSize. -->
  <div class="child" style="height: 15px; max-height: 50%;"></div>

  <!-- A percentage min-height should resolve itself against the percentageBlockSize. -->
  <div class="child" style="height: 5px; min-height: 50%;"></div>

  <!-- A replaced percentage height should resolve itself against the percentageBlockSize. -->
  <img class="child" style="height: 50%;" />

  <!-- A replaced percentage max-height should resolve itself against the percentageBlockSize. -->
  <img class="child" style="height: 15px; max-height: 50%;" />

  <!-- A replaced percentage min-height should resolve itself against the percentageBlockSize. -->
  <img class="child" style="height: 5px; min-height: 50%;" />
<script>
importWorkletAndTerminateTestAfterAsyncPaint(CSS.layoutWorklet, {url: 'support/layout-child-sizes-worklet.js'});
</script>