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Yes, you can absolutely run React components without the use of a server. You can edit an html file locally and put a react component in there. That's usually the first thing most React tutorials have you do.

If you're using a backend server you're just rendering the react stuff to html and sending it to the client.

Great! I'll go check out some React tutorials.

I think you are searching for something like dat.GUI [1], most WebGL-demos are using it.

[1] http://workshop.chromeexperiments.com/examples/gui/#1--Basic...

Yeah, you totally can! It's all front-end with React and Webpack. You can use Webpack in development and just have it build the static html and js files for gh-pages. Thats how the documentation site is built :)