Bind complex images to long descriptions using aria-describedby
Make sure aria-describedby is used to explicitly associate long descriptions to complex images
Complex images require two levels of information to be considered fully accessible: first, a descriptive ALT attribute value explaining the purpose or nature of the complex image, and second, a full text description of the complex image’s content, properly structured using HTML markup. But when both levels of information are independently set, another mechanism needs to be provided, so assistive technologies can explicitly associate both levels of information in a way that can be programmatically determined.
To do so, simply [...]