Strength of Evidence:
Document Type: Guideline
Provide a text equivalent for every non-text element that conveys information.
Text equivalents should be used for all non-text elements, including images, graphical representations of text (including symbols), image map regions, animations (e.g., animated GIFs), applets and programmatic objects, ASCII art, frames, scripts, images used as list bullets, spacers, graphical buttons, sounds, stand-alone audio files, audio tracks of video, and video.
Alt text allows the with visual impairments user to understand the meaning of the picture.
* Regardless of the ‘Relative Importance’ rating assigned by the reviewers, U.S. Federal Web sites must adhere to all Section 508 guidelines (see Guideline 3:1).