http://jsfiddle.net/Brj8m/

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ReactDOMTextarea
 */
'use strict';
var DOMPropertyOperations = require('DOMPropertyOperations');
var LinkedValueUtils = require('LinkedValueUtils');
var ReactDOMComponentTree = require('ReactDOMComponentTree');
var ReactUpdates = require('ReactUpdates');
var invariant = require('invariant');
var warning = require('warning');
var didWarnValueLink = false;
var didWarnValueNull = false;
var didWarnValDefaultVal = false;
function forceUpdateIfMounted() {