text: /**
   * @license
   * Copyright 2014 Google Inc. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  if (navigator && navigator.userAgent.indexOf('Firefox') != -1) {
    console.log('Loading Firefox Support.');
  
    Object.defineProperties(MouseEvent.prototype, {
      offsetX: {
        get: function() {
          return this.clientX - this.target.getBoundingClientRect().left;
        }
      },
      offsetY: {
        get: function() {
          return this.clientY - this.target.getBoundingClientRect().top;
        }
      }
    });
  }
  