Is it possible to write React + JSX without Webpack? What are the downsides?

Question

React

Is it possible to write in React + JSX without Webpack so that everything happens in the browser?

Answer 1

https://codepen.io/anon/pen/EwLLbN
Cons - the browser will have to compile the code on the fly, this is a big loss in performance.
Babel allows you to write in JSX, not webpack, so in the codepen example, a script with babel is added.

Answer 2

No. This is how vue can do it, and this is not .vue files, but divided into markup and component code

Answer 3

You can, but you need to connect the Babel transpiler. Here is described in more detail