The need to provide a text-based description of images to those who are unable to see the images is one of the most important principles of accessibility. In fact, it is the very first guideline listed in WCAG 2.1. Many authors and developers understand the purpose of providing alternative text or “ALT text,” but determining what to write as the ALT text can be a little confusing at first. A single image could have many descriptions of varying lengths - hence the traditional saying “A picture is worth a 1,000 words".
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The Whitepaper - Matching Image Description
The key to writing high-quality ALT texts and other image descriptions is to determine how the image contributes to the content of the document. Download the whitepaper to learn more.