Hi, Seems the issue is there in AEM 6.4 also. Refer https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/aem-6-4-spell-checker-in-rte/qaq-p/308881 for details. It seems to be how it works, you can add custom css/js to remove the alert and add the clientlibs to cq:dialog via extr...