Screen readers, or reviewers, are for people who are blind. These aids make on-screen information available as synthesized speech or a refreshable Braille display. They can only translate text information.
Images can be translated, if there is alternative text describing the image.
Tips on using the alternative text (ALT) attribute in image tags:
Always include alternative text attributes in image tags.
If the image is not important, set empty alternative text attributes.
Include alternative text to describe each frame of an animated image.
If you use Internet Explorer, hover your mouse pointer over the button, and a small text box should appear displaying the alternative text message.
After 3 loops, the animated button will stop rotating. Click "refresh" on your Web browser to restart the animation.
When images are used as links, include alternative text that states the exact label contained in the image. For example, if the image link says "Search," the alternative text should also be "Search."
Do not include additional information. For example, for the image link that says search, do not use the phrase "Click here to search."
Submit and Input Images
When images are used as submit buttons on forms, include equivalent alternative text.