Does anyone have a recommendation for what framework(s) to use to build a kind of proof of concept text editor? I've been toying with writing my own editor with

Does anyone have a recommendation for what framework(s) to use to build a kind of proof of concept text editor? I've been toying with writing my own editor with some somewhat strange features, not sure where to start if I'm just looking to play around with some ideas. Speed isn't a huge concern, but ease of implementing new features is.