title: Does ReactDOM.render wait for the document to be loaded before rendering?
body: <p>I'm wondering if I need to wait for the document to be loaded (i.e. listen to <code>DOMCOntentLoaded</code>) before calling <code>ReactDOM.render(...)</code>.  It doesn't seem like other React example apps are doing so, so I'm guessing inside the implementation of <code>ReactDOM.render</code> they already wait?</p>