I don't think ShadowDOM can be used for security purposes... https://blog.revillweb.com/open-vs-closed-shadow-dom-9f3d7427d1af https://blog.revillweb.com/open-v

I don't think ShadowDOM can be used for security purposes... https://blog.revillweb.com/open-vs-closed-shadow-dom-9f3d7427d1af https://blog.revillweb.com/open-vs-closed-shadow-dom-9f3d742... makes it seem trivial to access closed shadow roots via side channels like prototype manipulation