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If you just count the JS and HTML, then a minimal Electron app is (hopefully) also tiny.

That's not the same though. You have to bundle electron to run your app. Your Java app is fine as long as Java is installed.

Yes, but theoretically Electron apps could use the browser. (I think Google killed that option though.)

Yeah, it would be nice if the API's were standardized and then every browser had an "App Mode".