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Re:Top validation errors by kalleboo on Saturday June 16, 2012 @01:56PM (#4121150)
An empty alt can also just mean "I used a tool to generate this and didn't fill out the alt field" or "I just want this page to validate and still don't care".

Making the alt tag required won't make lazy developers/content providers any less lazy, so requiring it actually weakens the signal you're looking for.

Re:Top validation errors by TazeTSchnitzel on Saturday June 16, 2012 @02:29PM (#4121259)
And then if we make it optional, now developers and software don't have to even consider putting any alt content.

At least requiring one makes them think about it. And tools can put in "image".