     "sandbox" +
                " allow-scripts" +
                " allow-popups" +
                " allow-same-origin" +
                " allow-popups-to-escape-sandbox";
    const executor = window.open(same_origin + executor_path + csp);
    const executor_reply = await future(window, "message");
    assert_equals(executor_reply.data, "ready");

    const popup_name = token();
    const popup = await createNewPopup(test, popup_name);

    // Request the first real load from a DIFFERENT window with di