![]() Both require a spoken description of visual only content of a video. SC 1.2.7 Extended Audio Description (Prerecorded) (Level AAA) is related to SC 1.2.5 Audio Description (Prerecorded) (Level AA). SC 1.2.7 Extended Audio Description (Prerecorded) If possible, confirm with someone proficient in sign language that it is accurate. Minimally check that sign language is available. English may be signed with American Sign Language (ASL), British Sign Language (BSL), and more. A single spoken language may also have many sign language equivalents. I can determine this in spoken English with English captions, but I don't know sign language. ![]() What makes this more challenging for most people is checking that the sign language is accurate. Identify any content that requires captions, then check that there is sign language available as well. ![]() This can be assessed in the same way as SC 1.2.2 Captions (Prerecorded) (Level A), at least to an extent. ![]() The first is SC SC 1.2.6 Sign Language (Prerecorded) (Level AAA). Some success criteria deal with what WCAG calls time-based content. Here are some suggestions for testing a sample of the Level AAA success criteria. Most tools available for automated or manual testing only cover Level A and Level AA criteria. Testing Level AAA success criteria can be a challenge. However, they give a sense of the intent or spirit of the requirements and this can help understand how to test for them. Understanding these principles and guidelines is not essential for testing against WCAG 2.1 in theory the text of each SC provides all of the information you need. Provide text alternatives for any non-text content so that it can be changed into other forms people need, such as large print, braille, speech, symbols or simpler language. An example guideline, Guideline 1.1 Text Alternatives, is written as follows: These are in turn broken down into the individual requirements known as “Success Criteria” or "SC" for short. These four principles are broken down into twelve guidelines. Following a standard, such as HTML, makes this possible. This allows people to choose their user agent based on their own needs.
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