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The original LibHTML commit makes it sound like it was originally intended for embedding, so I don't see why not: https://github.com/SerenityOS/serenity/commit/a67e823838943b.... Electron has affordances beyond just being a web view, so you would have to add those (or work around not having them).

Probably. The Chromium browser engine first had to be turned into Electron, so there is no reason why you couldn't do the same here.

Yes, it should work. There are also cross-platform alternatives: Sciter and Ultralight.