JSX is a XML-like syntax extension to ECMAScript without any defined semantics. It's NOT intended to be implemented by engines or browsers. It's NOT a proposal to incorporate JSX into the ECMAScript spec itself. It's intended to be used by various preprocessors (transpilers) to transform these tokens into standard ECMAScript.

<script type="text/jsx">

React.render(

<h1>Hello, world!</h1>,

document.getElementById('example')

);

</script>

MIME types defined: text/jsx, text/typescript-jsx.