What is the recommended length for alt text descriptions of complex charts or graphs?

For complex charts or graphs, the recommended length for alt text descriptions is a short sentence or two at most. This approach strikes a balance between providing enough information to convey the essential details of the visual content while avoiding overwhelming users with excessive text.

Alt text serves the purpose of providing an equivalent experience for users who may not be able to perceive visual content. In the case of complex visuals like charts or graphs, a concise description allows users to understand the main idea or key elements without cluttering the information they receive. A brief yet informative summary can highlight critical data points, trends, or comparisons depicted in the graphic.

In contrast, overly brief descriptions may not provide sufficient context, and long, detailed paragraphs could be overwhelming or tedious for users relying on screen readers. By adhering to the guideline of using a short sentence or two, content creators can ensure that all users have meaningful access to the information presented in complex visual formats.