The resulting CSS is really inefficient. 1. It should only write the URL of the background image once, and only background-position on the rest. 2. The most w

The resulting CSS is really inefficient. 1. It should only write the URL of the background image once, and only background-position on the rest. 2. The most widely used width/height should be specified as the default and width/height properties only included when it differs. Also, to avoid the need of any padding between the images you can emulate background-crop with pseudo elements (http://nicolasgallagher.com/css-background-image-hacks/ http://nicolasgallagher.com/css-background-image-hacks/).