@stubbsstephen: As mentioned above, the snapshot reader has supported automatic dark mode since May.
If a snapshot isn't appearing correctly in dark mode, please post the URL (or email the snapshot to support@zotero.org with a link to this thread) and we'll take a look.
Thank you @AbeJellinek I am using version 7.0.0 beta 111. Blogs from medium.com are an example. I have tried quite a few other sites. geeksforgeeks.org will be light unless I switch to site's dark before taking the snapshot. I do not see any difference when Use Dark Mode for Content is enabled.
But, the equations in Wikipedia pages do not invert. Can you fix that?
If a snapshot isn't appearing correctly in dark mode, please post the URL (or email the snapshot to support@zotero.org with a link to this thread) and we'll take a look.