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* Copyright 2013-2015, Facebook, Inc.\n * All rights reserved.\n *\n * This source code is licensed under the BSD-style license found in the\n * LICENSE file in the root directory of this source tree. An additional grant\n * of patent rights can be found in the PATENTS file in the same directory.\n *\n * @providesModule isEventSupported\n */\n\n'use strict';\n\nvar ExecutionEnvironment = require('./ExecutionEnvironment');\n\nvar useHasFeature;\nif (ExecutionEnvironment.canUseDOM) {\n  useHasFeature =\n    document.implementation &&\n    document.implementation.hasFeature &&\n    // always returns true in newer browsers as per the standard.\n    // @see http://dom.spec.whatwg.org/#dom-domimplementation-hasfeature\n    document.implementation.hasFeature('', '') !== true;\n}\n\n/**\n * Checks if an event is supported in the current execution environment.\n *\n * NOTE: This will not work correctly for non-generic events such as `change`,\n * `reset`, `load`, `error`, and `select`.\n *\n * Borrows from Modernizr.\n *\n * @param {string} eventNameSuffix Event name, e.g. \"click\".\n * @param {?boolean} capture Check if the capture phase is supported.\n * @return {boolean} True if the event is supported.\n * @internal\n * @license Modernizr 3.0.0pre (Custom Build) | MIT\n */\nfunction isEventSupported(eventNameSuffix, capture) {\n  if (!ExecutionEnvironment.canUseDOM ||\n      capture && !('addEventListener' in document)) {\n    return false;\n  }\n\n  var eventName = 'on' + eventNameSuffix;\n  var isSupported = eventName in document;\n\n  if (!isSupported) {\n    var element = document.createElement('div');\n    element.setAttribute(eventName, 'return;');\n    isSupported = typeof element[eventName] === 'function';\n  }\n\n  if (!isSupported && useHasFeature && eventNameSuffix === 'wheel') {\n    // This is the only way to test support for the `wheel` event in IE9+.\n    isSupported = document.implementation.hasFeature('Events.wheel', '3.0');\n  }\n\n  return isSupported;\n}\n\nmodule.exports = isEventSupported;\n"},"lineCount":64}},"hash":"769330ef860c6f6094b4a80087d453b1","cacheData":{"env":{}}}