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Zotero has saved webpage snapshots as single HTML files since November 2020. We're using SingleFile under the hood.

(Disclosure: Zotero dev)

I'd been watching the changelogs for it intermittently and never caught it. Guessing that this is you: https://forums.zotero.org/discussion/85306/available-for-bet...

My apologies for the erroneous comment and massive THANKS! for adding that feature.