requestidlecallback/callback-iframe-different-origin.html

<!doctype html>
<title>window.requestIdleCallback in a cross-origin iframe.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
  onload = function() {
    const iframe = document.createElement('iframe');
    iframe.src = location.href.replace('://', '://www1.')
        .replace('callback-iframe-different-origin', 'resources/child');
    document.body.appendChild(iframe);
  };

  onmessage = function(e) {
    assert_equals(e.data, 'done');
    t.done();
  }
}, 'Check that idle tasks run in a cross-origin iframe');
</script>