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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/content-visibility-085.html 

<!doctype HTML>
<html class="reftest-wait">
<meta charset="utf8">
<title>CSS Content Visibility: auto with content changes</title>
<link rel="author" title="Cathie Chen" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="content-visibility auto element should be resized when content changes">

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

<style>
.auto {
  content-visibility: auto;
  width: fit-content;
}
.hidden { height: 0; }
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="auto">
  <div id ="target" class="hidden">
    <div style="width: 100px; height: 100px; background-color: green;"></div>
  </div>
</div>

<script>
function changeContent() {
  requestAnimationFrame(() => {
    target.classList.toggle("hidden");
    requestAnimationFrame(takeScreenshot);
  });
}
function runTest() {
  requestAnimationFrame(changeContent);
}

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