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I have used Electron previously, but now Ionic is my favorite http://ionicframework.com/

Electron is desktop only and Ionic is mobile only; you can't really compare them as there is never a choice between them.

Ionic 2 supports (or intends to support) Electron, desktop web and progressive web apps: http://blog.ionic.io/announcing-ionic-2-beta-7/

No CSS or Javascript. Sorry.