Text Description of the Accessibility Mistake Pyramid
This graphic is a three-layered pyramid. The bottom layer, the largest, represents the presentation category of mistakes. Among the common presentation mistakes are:
Failure to provide textual alternatives to non-textual content;
Improper use of HTML markup;
Frames/JavaScript without alternatives; and
Improper use of tables.
The middle layer represents the structure category of mistakes, such as:
Poor document layout;
Lack of contextual cues; and
Confusing/inconsistent navigation aids.
The top layer represents the content category of mistakes, such as:
Audio files without transcripts;
Video without captioning or descriptions; and
Files which require specific software (beyond the web browser).
