text: /**
   * @license Copyright 2017 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.
   */
  'use strict';
  
  /**
   * @fileoverview Ensures <img> elements have alternate text or a role of none or presentation.
   * See base class in axe-audit.js for audit() implementation.
   */
  
  const AxeAudit = require('./axe-audit');
  
  class ImageAlt extends AxeAudit {
    /**
     * @return {!AuditMeta}
     */
    static get meta() {
      return {
        category: 'Accessibility',
        name: 'image-alt',
        description: 'Image elements have `[alt]` attributes.',
        failureDescription: 'Image elements do not have `[alt]` attributes.',
        helpText: 'Informative elements should aim for short, descriptive alternate text. ' +
            'Decorative elements can be ignored with an empty alt attribute.' +
            '[Learn more](https://dequeuniversity.com/rules/axe/2.2/image-alt?application=lighthouse).',
        requiredArtifacts: ['Accessibility']
      };
    }
  }
  
  module.exports = ImageAlt;
  