[bottled_poe]

The previous comment is trying to sound smart by using obscure terminology. I would guess they mean to say that JSX is a translated subset of JS?

[couchand]

Thanks for your generosity. This is what I was referring to: JSX extends the PrimaryExpression in the ECMAScript 6th Edition (ECMA-262) grammar.

Please take a look at the draft JSX spec [0] for details.

[0]: https://github.com/facebook/jsx