2020年7月13日 · Web Content Accessibility Guidelines (WCAG) explains how to make web content more accessible to people with disabilities. WCAG covers web sites, applications, and other digital content. It is developed by the World Wide Web Consortium (W3C) Web Accessibility Initiative (WAI). WCAG is an international standard. There are three levels of conformance:

WCAG的每条准则都分为三个级别：A（最低），AA，AAA（最高）。 我们在用户体验设计中，可以参考 颜色对比度 的无障碍标准，提升界面信息的易读性。 颜色对比度 表示一种颜色与另一种颜色的差异，通常写为1：1或21：1。 比率中两个数字之间的差异越大，颜色之间的相对亮度差异越大。 根据万维网联盟（W3C），颜色与其背景之间的对比度基于其亮度（发出的光的强度）在1-21的范围内。 WCAG 中对对比度的标准可以很好地帮助设计师检查自己设计界面的可读性， …

WCAG是Web内容无障碍指南，分为Level A、AA、AAA三个级别。 Level A是最基础的标准，涉及可替代文本、媒体、键盘可访问性等；Level AA涵盖实时媒体、UI；Level AAA则包含高级功能和更细致的可读性要求。

2022年6月29日 · What are WCAG Conformance Levels A, AA, and AAA? Level A is the lowest level with 25 criteria. Level AA includes 37 criteria from both Levels A and AA. Level AAA numbers 60 criteria in total. Each new level is built by adding new criteria to the previous one. So, Level AA conformance includes all requirements from Level A.

The Web Content Accessibility Guidelines (WCAG) are part of a series published by the Web Accessibility Initiative (WAI) of the World Wide Web Consortium (W3C), the main international standards organization for the Internet.

Pages bearing this logo indicate a claim of conformance by the page author or content provider to conformance level Triple-A of the W3C Web Content Accessibility Guidelines 1.0, including all Priority 1, Priority 2, and Priority 3 checkpoints defined in the Guidelines. The Web Content Accessibility Guidelines 1.0 explain how to make Web content ...

2022年2月7日 · Level AAA: Level AAA is the optimal compliance level which makes your site accessible to the maximum number of users, while making improvements to the user experience. Essential Level AAA requirements include: Sign language interpretation for audio or video content; Color contrast is at least 7:1 in most instances; Timing is not an essential ...

The contrast ratio of 7:1 was chosen for level AAA because it compensated for the loss in contrast sensitivity usually experienced by users with vision loss equivalent to approximately 20/80 vision.

2024年7月15日 · The W3C recommends conforming to WCAG 2.1 Level AA. Websites that follow all Level AA success criteria are generally considered accessible for most users with disabilities. For example, in public statements and settlement agreements, the U.S. Department of Justice has referenced WCAG Level AA as a reasonable standard for following the ...

2024年2月7日 · Level AAA: The Most Stringent Standards. Purpose: Eliminates nearly all barriers, offering maximum accessibility, but is not required for compliance. Example Rules: Text must meet the highest contrast ratios, helping users with severe visual impairments. Live audio requires both captions and sign language interpretation.