<style>
span {
  font-size: 10px;
  font-family: Ahem;
}
</style>
<!-- PASS if the green outline is visible -->
<span id=changeThis>outline</span>
<pre id=result></pre>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}
setTimeout(function() {
  if (window.internals) {
    internals.startTrackingRepaints();
    changeThis.style.outline = "50px solid green";
    let repaintRects = internals.repaintRectsAsText();
    internals.stopTrackingRepaints();
    result.textContent = repaintRects.indexOf('-') == -1 ? "FAIL: 50px outline should produce negative vertical position for repaint" : "PASS";
    if (window.testRunner)
      testRunner.notifyDone();
  } else
    changeThis.style.outline = "50px solid green";
}, 0);
</script>