What does this mean?
When an image is the only content of a link, it should specify alternative text,
alt attribute. The alternative text should describe the purpose of the link.
Without this, some users will be unable to determine what a link does, for example anyone using a screen reader.
To fix this, simply add an
alt attribute to the image inside the link, e.g.:
<a href="/apple"> <img src="apple.png" alt="Apple"> </a>
How close this website is to fixing this issue.