* Same as document.activeElement but wraps in a try-catch block. In IE it is * not safe to call document.activeElement if there is nothing focused.

* Returns the iterator method function contained on the iterable object. * * Be sure to invoke the function with the iterable as context: * *

* Copyright (c) 2013-present, Facebook, Inc. * All rights reserved. * * This source code is licensed under the BSD-style license found in the * LI

* Processes any enqueued updates. * * @private

* Given a `prevElement` and `nextElement`, determines if the existing * instance should be updated as opposed to being destroyed or replaced by a new

* @param {object} component * @param {?object} props

* Poll selection to see whether it's changed. * * @param {object} nativeEvent * @return {?SyntheticEvent}

* Creates a function that invokes two functions and merges their return values. * * @param {function} one Function to invoke first. * @param {funct

* Creates an array containing the nodes rendered from the supplied markup. The * optionally supplied `handleScript` function will be invoked once for

* Creates and returns a routes object from the given ReactChildren. JSX * provides a convenient way to visualize how routes in the hierarchy are *

* Convert a value into the proper css writable value. The style name `name` * should be logical (no hyphens), as specified * in `CSSProperty.isUnitl

* Dispatch the event to the listener. * @param {SyntheticEvent} event SyntheticEvent to handle * @param {boolean} simulated If the event is simulate

* Flattens children that are typically specified as `props.children`. Any null * children will not be included in the resulting object. * @return {!

* @param {DOMElement} node input/textarea to focus

* Google Input Tools provides composition data via a CustomEvent, * with the `data` property populated in the `detail` object. If this * is availabl

* Given any node return the first leaf node without children. * * @param {DOMElement|DOMTextNode} node * @return {DOMElement|DOMTextNode}

* Gets the markup wrap configuration for the supplied `nodeName`. * * NOTE: This lazily detects which wraps are necessary for the current browser.

* Get object describing the nodes which contain characters at offset. * * @param {DOMElement|DOMTextNode} root * @param {number} offset * @return

* Extracts the `nodeName` from a string of markup. * * NOTE: Extracting the `nodeName` does not require a regular expression match * because we mak

* Drill down (through composites and empty components) until we get a native or * native text component. * * This is pretty polymorphic but unavoid

* Gets the key used to access text content on a DOM node. * * @return {?string} Key used to access text content. * @internal

* True if the supplied DOM node has a direct React-rendered child that is * not a React root element. Useful for warning in `render`, * `unmountComp

* While `isCollapsed` is available on the Selection object and `collapsed` * is available on the Range object, IE11 sometimes gets them wrong. * If

* Does our fallback mode think that this event is the end of composition? * * @param {string} topLevelType * @param {object} nativeEvent * @return