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can JSX be translated in the browser? that will make it even easier to avoid tooling and just use script tags for dev.

Yes, there is additional js loaded to do that. In the developer console you get a warning. It may be a tad slower.

Are you referring to JSXTransformer? I thought that was deprecated?

Yes, but now there's a version of Babel that runs in the browser and transpiles from JSX.

Yes. The link is in the flowchart.