<style>
math {
  font-family: Ahem;
  font-size: 20px;
}
</style>
<!-- This is a bit flaky, but repros in Safari after a few attempts -->
<math style="display: block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mn>PASS if</mn>
  <mn id=change_this></mn>
</math>
<pre id=repaints></pre>
<script src="../../resources/ui-helper.js"></script>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}
async function runTest() {

  if (window.internals)
    internals.startTrackingRepaints();

  change_this.textContent = 'this is visible.';

  await UIHelper.renderingUpdate();

  if (window.internals) {
    repaints.innerHTML = window.internals.repaintRectsAsText();
    internals.stopTrackingRepaints();
  }

  if (window.testRunner)
    testRunner.notifyDone();
}

window.addEventListener('load', runTest);
</script>
