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docs/guides/client-side-rendering.md

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+# Client-side rendering
+
+Render apps using `AppRegistry`:
+
+```js
+// index.web.js
+
+import App from './src/App';
+import React from 'react';
+import { AppRegistry } from 'react-native';
+
+// register the app
+AppRegistry.registerComponent('App', () => App);
+
+AppRegistry.runApplication('App', {
+  initialProps: {},
+  rootTag: document.getElementById('react-app')
+});
+```
+
+Or render individual components:
+
+```js
+import AppHeader from './src/AppHeader';
+import React from 'react';
+import { render } from 'react-native';
+
+render(<AppHeader />, document.getElementById('react-app-header'))
+```
+
+(Components will also be rendered within a tree produced by calling
+`ReactDOM.render` (i.e., an existing web app), but
+otherwise it is not recommended.)
+
+You might need to adjust the styles of the HTML document's root elements for
+your app to fill the viewport.
+
+```html
+<html style="height:100%">
+<body style="height:100%">
+<div id="react-root" style="display:flex;height:100%"></div>
+```