root-bounds.html | Explore in Territory

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
pre, #log {
  position: absolute;
  top: 0;
  left: 200px;
}
iframe {
  width: 150px;
  height: 200px;
}
</style>
<iframe src="http://localhost:8080/intersection-observer/resources/root-bounds-iframe.html"></iframe>
<script>
async_test(t => {
  let records = [];
  // This window will receive a message from the iframe for each IntersectionObserver
  // notification.
  window.addEventListener("message", event => {
    if (event.data == "done") {
      t.step(() => {
	assert_equals(records.length, 3);
        assert_not_equals(records[0].rootBounds, "null", "First notification reports root bounds");
        assert_equals(records[1].rootBounds, "null", "Second notification does not report root bounds");
        assert_equals(records[2].rootBounds, "null", "Third notification does not report root bounds");
      });
      t.done();
    }
    records.push(event.data);
  });
}, "IntersectionObserver target moved from a top-level document to a cross-origin iframe does not report root bounds.");
</script>
chromium/third_party/blink/web_tests/http/tests/intersection-observer/root-bounds.html
