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chromium/third_party/blink/web_tests/external/wpt/css/css-values/calc-zero-percent-height.html 

<!doctype html>
<link rel="help" href="https://www.w3.org/TR/css-values-4/#calc-computed-value">
<link rel="help" href="https://www.w3.org/TR/CSS2/visudet.html#the-height-property">
<link rel="author" title="Xiaocheng Hu" href="mailto:[email protected]">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<title>0% in calc() should be preserved</title>
<script>
CSS.registerProperty({
  name: '--custom-height',
  syntax: '<length-percentage>',
  initialValue: 'calc(0% + 0px)',
  inherits: false
});
</script>
<style>
.height-filler {
  height: 100px;
}

.test {
  width: 100px;
  height: var(--custom-height);
  background-color: green;
}
</style>
<p>Test passes if there is a filled green square.</p>
<div class="test">
  <div class="height-filler">
  </div>
</div>