React Base Fiddle (JSX)

Starting point for creating JSFiddles with React. This uses React with Addons.

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/react-with-addons.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration.js"></script>

<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

var PropTypes = React.PropTypes;

class A extends React.Component {
    render() {
        return (
            <div>
                {React.Children.map(this.props.children, function(child) {
                    return React.cloneElement(child, {
                        name: this.props.name,
                        value: this.props.value
                    });
                }, this)}
            </div>
        );
    }
}

A.propTypes = {
    name: PropTypes.string.isRequired,
    value: PropTypes.string.isRequired
};

class B extends React.Component {
    render() {
        return <span>{this.props.name} : {this.props.value}</span>;
    }
}

B.propTypes = {
    name: PropTypes.string.isRequired,
    value: PropTypes.string.isRequired
};
 
React.render(
<A name="name" value="value">
    <B></B>
</A>
, document.getElementById('container'));