Provide long descriptions for complex images using longdesc
Make sure complex images are assigned longdesc attributes that lead to full text descriptions
Whenever a complex image is used in a page and the full text description of that image cannot be embedded in the ALT attribute value of the image or placed right next to it, another option is use the ALT attribute value to describe the image’s nature or purpose, and create an additional remote file, in which the long text description of the complex image can then be found.
To do so, simply use the LONGDESC attribute [...]
5 stars; 90.9% of tests passed. [Note: this rating is a work in progress.]
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