mozilla-release/testing/web-platform/tests/fullscreen/api/element-ready-check-containing-iframe-manual.tentative.html

<!DOCTYPE html>
<!--
   Tentative,  due to:
     https://github.com/whatwg/html/issues/1903
   Once the issue is resolved, this test would replace the corresponding
   non-tentative test (element-ready-check-containing-iframe-manual.html)
-->
<title>Element ready check for containing iframe</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../trusted-click.js"></script>
<div id="log"></div>
<iframe allowfullscreen></iframe>
<iframe allowfullscreen></iframe>
<script>
// wait for load event to avoid https://bugzil.la/1493878
window.onload = function() {
  async_test(function(t) {
      var iframes = document.getElementsByTagName("iframe");
      trusted_request(t, iframes[0].contentDocument.body, iframes[0].contentDocument.body);
      iframes[0].contentDocument.onfullscreenchange = t.step_func(function() {
          assert_equals(document.fullscreenElement, iframes[0]);
          trusted_request(t, iframes[1].contentDocument.body, iframes[0].contentDocument.body);
          iframes[1].contentDocument.onfullscreenerror = t.unreached_func("fullscreenerror event");
          iframes[1].contentDocument.onfullscreenchange = t.step_func_done();
      });
  });
};
</script>