Might it make sense to whitelist the HTML <dialog></dialog> element as a native feature in the Discourse Composer?
What use-case are you thinking of? I don’t think we’d want regular users to start adding popup dialogs to their posts? 
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For uses similar to <details></details> and popup footnotes.
It would provide another (now conventional) way for users to display content more compactly and more expressively. 
I think any uses of <dialog> require some JS to actually open/close it? In which case, this is beyond simple html allowlisting, and would probably be theme/plugin territory.
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