Specify alternative text for images inside links
Also
From: WCAG 2.0 A 1.1.1
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.
From: WCAG 2.0 A 1.1.1
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.