Alternative text (alt text) is meant for readers who cannot see an image, such as blind readers and readers who use a text or mobile browser. It should summarize an image's purpose, and should not duplicate its caption. Every image should have alt text, except for purely decorative images, which should instead have "|alt=|link=".
Mario's Time Machine
The following table shows images and captions on the left, and alt text and captions on the right: the right column is what a visually impaired reader will hear. This table was computed from the copy of Mario's Time Machine cached on 17 June 2013 at 02:01.
| Image and thumbnail | Text description |
|---|---|
 | Mario's Time Machine SNES.jpg
|
|
Screenshot of the Nintendo Entertainment System version of Mario's Time Machine
|
 | Book icon
|
 | Wikipedia book
|
| Wikipedia book
|
 | Portal
|
