Function isEventSupported

docs/external/js/react-dom.development.js:3475–3490

* Checks if an event is supported in the current execution environment. * * NOTE: This will not work correctly for non-generic events such as `change`, * `reset`, `load`, `error`, and `select`. * * Borrows from Modernizr. * * @param {string} eventNameSuffix Event name, e.g. "cli

(eventNameSuffix)

   */

  function isEventSupported(eventNameSuffix) {
    if (!canUseDOM) {
      return false;
    }

    var eventName = 'on' + eventNameSuffix;
    var isSupported = eventName in document;

    if (!isSupported) {
      var element = document.createElement('div');
      element.setAttribute(eventName, 'return;');
      isSupported = typeof element[eventName] === 'function';
    }

    return isSupported;
  }

  /**
   * Summary of `DOMEventPluginSystem` event handling: