根据 definition of conformance from the W3C website, there are five requirements that must be met in order for content to be classified as conforming to WCAG 2.0:

  1. “一致性水平: One of the following levels of conformance is met in full.
    • Level A: For Level A conformance (the minimum level of conformance), the Web page satisfies all the Level A Success Criteria, or a conforming alternate version is provided.
    • AA级:符合AA级, the Web page satisfies all the Level A 和 Level AA Success Criteria, or a Level AA conforming alternate version is provided.
    • Level AAA: For Level AAA conformance, the Web page satisfies all the Level A, Level AA 和 Level AAA Success Criteria, or a Level AAA conforming alternate version is provided.”
  2. “整页: Conformance (和 conformance level) is for full Web page(s) only 和 cannot be achieved if part of a Web page is excluded.”
  3. “完整的流程: When a Web page is one of a series of Web pages presenting a process (i.e., a sequence of steps that need to be completed in order to accomplish an activity), all Web pages in the process conform at the specified level or better.”
  4. “Only Accessibility-Supported Ways of Using Technologies: Only accessibility-supported ways of using technologies are relied upon to satisfy the success criteria.” This basically says that the way chosen to satisfy the Success Criteria will work with user agents 和 assistive technologies – meaning essentially that st和ard methods are used to expose content to assistive technology or special accessibility features in mainstream user agents.
  5. “不干涉: If technologies are used in a way that is not accessibility supported, or if they are used in a non-conforming way, then they do not block the ability of users to access the rest of the page.” This basically says that technologies that are not accessibility supported can be used, as long as the non-accessibility-supported material does not interfere 和 all the information is also available using technologies that are accessibility supported.

作为满足WCAG 2的最低要求.0 AA级标准, web developers 和 content creators must meet the following benchmarks before a work is approved for publishing. 内容必须是:

可感知的

Make content 和 controls perceivable by all users.

  • 图像有 替代文本?
  • 视频有 标题 音频是否有 成绩单?
  • Does the web page or document 包括 headings, lists, ARIA l和marks, 和 other semantic elements 沟通文档结构?
  • 是 标签的顺序 和 阅读顺序 逻辑和直觉?
  • Do form fields with web pages 和 documents have appropriately coded 标签和提示?
  • 你有没有避免使用 视觉特征 传递信息(如.g., “click the circle on the left” or “required fields are in red”)?
  • 这个界面有 足够的对比 between text color 和 background color?
  • 内容 当文本被放大时缩放 高达200%?

可操作的

Make content 和 controls operable by all users.

  • Can all menus, links, buttons, 和 other controls be operated by 键盘, to make them accessible to users who are unable to use a mouse?
  • 网页是否包含 可见焦点指示器 so all users, especially those using a 键盘, can easily track their current position?
  • 做一些功能 滚动或自动更新 (eg., 幻灯片, carousels) have prominent accessible controls that enable users to pause or advance these features on their own?
  • 做那些有 时间限制 包括 mechanisms for adjusting those limits for users who need more time?
  • 你是否避免使用这样的内容 闪光或闪烁?
  • Does the web page or document have a title that describes its topic or purpose?
  • Are mechanisms in place that allow users to 绕过内容块 (e.g., a “skip to main content” link on a web page or bookmarks in a PDF)?
  • 这个网站包括 查找内容的两种或两种以上方式, such as a navigation menu, search feature, or site map?
  • Is 链接文本 有意义的，独立于上下文的?

可以理解的

Make content 和 user interfaces underst和able to all users.

  • 有 语言 of the web page or document (or individual parts of a multilingual document) been defined?
  • Have you avoided links, controls, or form fields that automatically trigger a change in context?
  • Does the website, PowerPoint, document 包括 一致的导航?
  • 网上表格是否提供 helpful, accessible error 和 verification messages?

健壮的

Make content robust enough that it can be interpreted reliably by a wide variety of user agents, 包括辅助技术.

  • 网页是否使用编码 有效的HTML?
  • 做丰富的, 动态, 网络接口, 比如模态窗口, 下拉菜单, 幻灯片, 和旋转木马, 包括 ARIA标记 ?