The longdesc attribute

What is the longdesc attribute? Can you explain its purpose?


The longdesc attribute of the img element has been around since HTML 4 and is also valid in HTML5. This attribute is designed to provide a more detailed description of an image, compared to the information offered in the alt attribute. The interesting thing is that instead of providing a description by itself (like the alt attribute does), longdesc points to a hyperlink containing the description.

An example of the use of longdesc is presented below:


The shown map of Italy illustrates its division in regions...


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