Complex Visuals Need an Equivalent
Charts, diagrams, maps, and infographics may require the important takeaway, the data relationships, or a longer description instead of one short label.
Read / Reference
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Guidance for graphs, charts, diagrams, maps, and other visuals that contain more information than can usually fit in a short text alternative.
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Understanding WCAG 2.2: 1.1.1 Non-text Content
WCAG's requirement that non-text content have an alternative serving the equivalent purpose.