chromium/third_party/blink/web_tests/compositing/text-on-large-layer.html

<!DOCTYPE html>
<html>
<script>
if (window.testRunner) {
  testRunner.waitUntilDone();
  // The mac port renders tiled layers asynchronously, so we have to wait a bit to get the actual rendering result.
  window.setTimeout(function() {
    testRunner.notifyDone();
  }, 100);
}
</script>
<body style="overflow:hidden">
<div style="will-change: transform; width: 2000px; height: 10000px; top:1px; left:3px; position:absolute">
This is some text inside a very large composited layer to test that it is rendered sharply.<br>
The test passes if this text is crisp.
</div>
</body>
</html>