stubbornella/csslint — pull request #200 by hpbuniat (2011-10-20 06:39:09+00:00)
Title: Added rule to detect multiple usage of the same background-image

When working with sprites it is likely that someone writes css like:
.aSpriteImage {background: url(image.png) ..}
.anotherSpriteImage {background: url(image.png) ..}
.yetAnotherSpriteImage {background: url(image.png) ..}

The common background-image should be applied by using a common class or specific selectors. This rule should detect such issues.