Give images that are also a link a text alternative that describes the purpose of the link

There are cases when instead of text only an image is used as a link. These images are called functional images. These can be images that refer to another page or website, but also images that perform an action on the page.

These images must have a text alternative that describes the purpose of the link, or describes what happens when the image is clicked. Reading software uses the text alternative as link text. That is why it is more important to describe the purpose of the link, rather than what is in the image.

If there is also text on a functional image, then both the text on the image and the purpose of the link must be included in the text alternative. As a result, visitors who work with speech recognition can also easily reach the link.