mask-clip-change-stacking-child.html

<!doctype HTML>
<script src="../resources/text-based-repaint.js"></script>
<div id="target" style="position: absolute; width: 300px; height: 300px; -webkit-mask: linear-gradient(red, red)">
  <div style="isolation: isolate; width: 500px; height: 500px; background: lightblue">
    <div style="positiion: relative"></div>
  </div>
</div>
<script>
function repaintTest() {
  target.style.height = "200px";
}
onload = runRepaintTest;
</script>

chromium/third_party/blink/web_tests/paint/invalidation/clip/mask-clip-change-stacking-child.html