4 ms·This is almost certainly a "css sprite"...a compression method for web graphics.by emmett 18y agoThis is almost certainly a "css sprite"...a compression method for web graphics.unalone 18y agoHow does it work?emmett 18y agohttp://css-tricks.com/css-sprites-what-they-are-why-theyre-cool-and-how-to-use-them/ http://css-tricks.com/css-sprites-what-they-are-why-theyre-c...