Basic Guide for Web Accessibility

Non-text content includes audio, video, pictures, pictures of text, captcha, graphs, charts and maps.

There are always exceptions to some of these rules. Logotypes and decoration do not often need alt text, but it can still be helpful to the user to include it.

There are times when a non-text image is necessary and it can be included, as long as text descriptions accompany it.

Testing situations are also exceptions when presenting media without additional texts.

There are exceptions for many rules depending on the circumstances, but reading through the linked "Understanding Success Criterion XXX" can help with these issues.

____ Provide a text option if there is media only content. (1.2.1)

____ Caption video content. (1.2.2)

____ Include an audio description for videos or a text alternative. (1.2.3)

____ Live audio is automatically captioned. (1.2.4)

____  Add audio descriptions to videos. (1.2.5)

____ The non-text contrast ratio is 3:1 for colors next to each other (1.4.11)

____ A sign language video is provided with any timed media. (1.2.6)

____ Pauses should be included in video for audio description. (1.2.7)

____ Anytime AV content is offered, text content should also be provided. (1.2.8)

____ Images of text are only used for decoration or as an option to text. (1.4.9) 

____ Content should not include 3 flashes < 1 second on a web page. (2.3.2)

____ The user can start and stop any animation. (2.3.3)