s_window_loaded,
                    "Below-viewport loading=lazy iframes do not block the " +
                    "window load event");
        assert_true(below_viewport_iframe.element().contentDocument.body.
                    innerHTML.includes("<p>Subframe</p>"),
                    "The loading=lazy iframe's content is accessible upon loading");
    }));

  }, "When a loading=lazy iframe is loaded, it loads relative to the " +
     "document's base URL computed at parse-time.");
</script>

<body>
  <