<!DOCTYPE html>
<pre id=log></pre>
<div id=target style="aspect-ratio: 1 / 2;"></div>
<script>
if (window.testRunner && window.internals) {
    testRunner.dumpAsText();
    document.body.offsetTop;
    internals.startTrackingLayoutUpdates();
    target.style.color = "blue";
    document.body.offsetTop;
    log.textContent = `Layout count: ${internals.layoutUpdateCount()}`;
}
</script>