<img> element that is located inside an
<a> (i.e. link) element should use an alternative text (alt attribute) which supplements the link text and describes the image. Otherwise it should use a null value. Example:
<img src="house.gif" alt="home page icon"> Go to the home page
Engine scans the page for any
<a> element that contains an
<img> element, and compares the “alt” attribute with the
<a> inner text.
This helps users understand the purpose of each link so they can decide whether they want to select the link.
<img src="/example_"skip.gif" alt="example_">