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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/content-visibility-032.html 

<!doctype HTML>
<html class="reftest-wait">
<meta charset="utf8">
<title>Content Visibility: hidden iframe, size changes</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="content-visibility-032-ref.html">
<meta name="assert" content="content-visibility hidden iframes can change size.">

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

<style>
.hidden {
  content-visibility: hidden;
}
</style>
<p>Test fails if the box below is square.</p>
<iframe class=hidden id=frame width=200 height=200 srcdoc='Lorem ipsum'></iframe>

<script>
async function runTest() {
  document.getElementById("frame").height = 300;
  requestAnimationFrame(takeScreenshot);
}

onload = () => { requestAnimationFrame(runTest); };
</script>