Via Web Graphics, ScriptyGoddess’ Get ALT Info bookmarklet, which displays a list of all of the images on a page along with their alt attributes; great for testing a page to make sure you haven’t missed any.
This is Quick testing of alt attributes by Simon Willison, posted on 19th June 2003.
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Previously hosted at http://simon.incutio.com/archive/2003/06/19/testingAltAttributes