Alt attribute
Also called: alt tag
The alt attribute provides in html code a way to add a description to images. This alternative description is not visible to regular visitors but is visible to visitors who cannot view images. Think of people with visual impairments who use customized browsers. Without a descriptive alt attribute, the content of an image is not accessible.
The alt attribute is also valuable to search engines and other robots. They look at the content of the alt tag to determine what an image shows. This makes providing good descriptive alt tags (possibly with relevant keywords) one of the actions for Web site optimization for search engines.
Example of an image tag provided with an alt attribute:
<img src="afbeelding.gif" alt="Ons restaurant aan het Marktplein" />
