<!DOCTYPE html>
<pre id="mainThreadScrollingReasons"></pre>
<div style="position: sticky"></div>
<script>
 if (window.testRunner)
     testRunner.dumpAsText(true);
 window.addEventListener('load', function() {
     document.getElementById("mainThreadScrollingReasons").innerText = window.internals.mainThreadScrollingReasons(document);
 });
</script>