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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/content-visibility-040.html 

<!doctype HTML>
<html class="reftest-wait">
<meta charset="utf8">
<title>Display Locking: absolute positioned in flex, which is in a hidden div.</title>
<link rel="author" title="Vladimir Levin" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<link rel="match" href="container-ref.html">
<meta name="assert" content="content-visibility hidden flex and abspos descendants don't paint">

<script src="/common/reftest-wait.js"></script>

<style>
#container {
  width: 150px;
  height: 150px;
  background: lightblue;
  position: relative;
}
div > div {
  width: 100px;
  height: 100px;
  background: red;
}
.hidden {
  content-visibility: hidden;
}
.flex { display: flex; }
.abspos { position: absolute; }
</style>

<div id=container>
  <div class=flex>
    <div class=abspos></div>
  </div>
</div>

<script>
async function runTest() {
  document.getElementById("container").classList.add("hidden");
  requestAnimationFrame(takeScreenshot);
}

window.onload = requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>