raf-throttling-out-of-view-cross-origin-page.html

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
#frame {
  position: absolute;
  top: -1000px;
}
</style>

<script>
function on_subframe_load() {
  // Check how many animation frames have been served to the frame after 1
  // second.
  setTimeout(() => {
    var frame = document.querySelector('#frame');
    frame.contentWindow.postMessage(null, '*');
  }, 1000);
}
</script>

<iframe
    id="frame"
    sandbox="allow-scripts"
    src="resources/raf-throttling-frame.html"
    onload="on_subframe_load()"></iframe>

<script>
if (window.testRunner)
  testRunner.dumpAsText();
let throttlingTest = async_test("Test requestAnimationFrame() throttling in out-of-view cross origin frames");

addEventListener('message', (e) => {
  let rafCount = e.data;
  // TODO(skyostil): Chrome always runs one animation frame while the layout
  // test harness does none. Find out where the difference is coming from.
  // Note: this test has been changed to count RAFs from the start of the
  // subframe's load event, which may change things. This change was necessitary
  // to support being able to put sandboxed iframes in a separate process.
  throttlingTest.step(() => {
    assert_less_than_equal(rafCount, 1, "requestAnimationFrame() callback count")
  });
  throttlingTest.done();
});
</script>
chromium/third_party/blink/web_tests/fast/dom/raf-throttling-out-of-view-cross-origin-page.html
