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chromium/third_party/blink/web_tests/external/wpt/html/rendering/widgets/button-layout/button-dynamic-content.html 

<!DOCTYPE html>
<link rel="help" href="https://issues.chromium.org/issues/353898969">
<link rel="match" href="button-dynamic-content-ref.html">
<button style="width: 100px; height: 100px;">
  text text text text text text text text
  <span id="target"></span>
</button>
<script>
document.body.offsetTop;
document.getElementById('target').innerText = "text";
</script>