Please see if this response helps. https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/aem-react-spa-extra-divs-on-page-source/m-p/609648/highlight/true#M152982

My understanding is this. Every component comes with its own empty-text placeholder and is appended below the actual component markup. When not in author an empty div tag is generated. Since it is a code level issue, I dont think there is an easy way around this. Perhaps the issue is remediated in v...

Allowed components property is perhaps required by editable components module inside AEM Editor. However for the standalone app, one option is to connect with publisher or you can pass a custom header which can be scanned by a custom sling filter which can parse entire json and remove unwanted attri...