The Zombie: No alt text attribute on images
Always a Zombie? Yes
Severity: medium – has accessibility and SEO implications
Why is it a zombie: Search Engines and Screen Reader Users won’t be able to access/understand the content.
Cure the Zombie by: Adding a blank alt attribute to decorative images and a short, clear description to all other images. No need to include “Image of”/“Picture of” etc, just describe what’s important or significant about the image.