What does this mean?

When an image is the only content of a link, it should specify alternative text, via an 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>


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