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chromium/third_party/blink/web_tests/compositing/iframe-graphics-tree-changes-parents-does-not.html 

<!doctype HTML>

<script>
if (window.testRunner) {
  testRunner.waitUntilDone();
  window.onmessage = function() {
    testRunner.notifyDone();
  };
}
</script>

<style>
iframe {
  width: 200px;
  height: 200px;
}
</style>

<iframe marginwidth=0 marginheight=0 frameborder=0 src="resources/iframe-graphics-tree-changes-parents-does-not-frame.html"></iframe>