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target = event.target;\n    var button = nativeEvent.button;\n\n    // Calculate pageX/Y if missing and clientX/Y available\n    if (target && isNullOrUndefined(event.pageX) && !isNullOrUndefined(nativeEvent.clientX)) {\n      eventDoc = target.ownerDocument || document;\n      doc = eventDoc.documentElement;\n      body = eventDoc.body;\n      event.pageX = nativeEvent.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc && doc.clientLeft || body && body.clientLeft || 0);\n      event.pageY = nativeEvent.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0) - (doc && doc.clientTop || body && body.clientTop || 0);\n    }\n\n    // which for click: 1 === left; 2 === middle; 3 === right\n    // do not use button\n    if (!event.which && button !== undefined) {\n      if (button & 1) {\n        event.which = 1;\n      } else if (button & 2) {\n        event.which = 3;\n      } else if (button & 4) {\n        event.which = 2;\n      } else {\n        event.which = 0;\n      }\n    }\n\n    // add relatedTarget, if necessary\n    if (!event.relatedTarget && event.fromElement) {\n      event.relatedTarget = event.fromElement === target ? event.toElement : event.fromElement;\n    }\n\n    return event;\n  }\n}];\n\nfunction retTrue() {\n  return TRUE;\n}\n\nfunction retFalse() {\n  return FALSE;\n}\n\nfunction DomEventObject(nativeEvent) {\n  var type = nativeEvent.type;\n\n  var isNative = typeof nativeEvent.stopPropagation === 'function' || typeof nativeEvent.cancelBubble === 'boolean';\n\n  _EventBaseObject2['default'].call(this);\n\n  this.nativeEvent = nativeEvent;\n\n  // in case dom event has been mark as default prevented by lower dom node\n  var isDefaultPrevented = retFalse;\n  if ('defaultPrevented' in nativeEvent) {\n    isDefaultPrevented = nativeEvent.defaultPrevented ? retTrue : retFalse;\n  } else if ('getPreventDefault' in nativeEvent) {\n    // https://bugzilla.mozilla.org/show_bug.cgi?id=691151\n    isDefaultPrevented = nativeEvent.getPreventDefault() ? retTrue : retFalse;\n  } else if ('returnValue' in nativeEvent) {\n    isDefaultPrevented = nativeEvent.returnValue === FALSE ? retTrue : retFalse;\n  }\n\n  this.isDefaultPrevented = isDefaultPrevented;\n\n  var fixFns = [];\n  var fixFn = undefined;\n  var l = undefined;\n  var prop = undefined;\n  var props = commonProps.concat();\n\n  eventNormalizers.forEach(function (normalizer) {\n    if (type.match(normalizer.reg)) {\n      props = props.concat(normalizer.props);\n      if (normalizer.fix) {\n        fixFns.push(normalizer.fix);\n      }\n    }\n  });\n\n  l = props.length;\n\n  // clone properties of the original event object\n  while (l) {\n    prop = props[--l];\n    this[prop] = nativeEvent[prop];\n  }\n\n  // fix target property, if necessary\n  if (!this.target && isNative) {\n    this.target = nativeEvent.srcElement || document; // srcElement might not be defined either\n  }\n\n  // check if target is a text node 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