JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://fb.me/react-with-addons-0.9.0.js"></script>
<script src="http://fb.me/JSXTransformer-0.9.0.js"></script>
<script src="http://fb.me/react-js-fiddle-integration.js"></script>

JavaScript 1.7

/** @jsx React.DOM */

var App = React.createClass({
    render: function() {
        return <svg ref="svg">
            <circle r="9" cx={this.centerX()} cy="15"/>
        </svg>;
    },
    centerX: function() {
        var svg = this.refs.svg.getDOMNode();
        return svg.offsetLeft + Math.round(svg.offsetWidth / 2);
    }
});
 
React.renderComponent(<App/>, document.body);