Function initialize

docs/external/js/react-dom.development.js:8399–8403

(nativeEventTarget)

  var startText = null;
  var fallbackText = null;
  function initialize(nativeEventTarget) {
    root = nativeEventTarget;
    startText = getText();
    return true;
  }
  function reset() {
    root = null;
    startText = null;