chromium/third_party/blink/web_tests/paint/invalidation/compositing/opacity-from-zero-to-non-zero-composited.html

<!DOCTYPE html>
<div id="target" style="width: 100px; height: 100px; background: green; opacity: 0; will-change: opacity"></div>
<script src="../resources/text-based-repaint.js"></script>
<script>
function repaintTest() {
  target.style.opacity = 0.5;
};
onload = runRepaintAndPixelTest;
</script>