The Animated PNG is the cousin of the MNG and the second cousin of the Static PNG. You might be telling yourself, whaaa? Now this is interesting, not to mention what is an animated PNG anyways? The developers who came up with the original PNG(Portable Network Graphics) decided not to add support for animation. So began work on another format MNG (Multiple-image Network Graphics). This format never really caught on so much as the static PNG did so developers decided to come up with a new, or not so new format, the Animated PNG.
Animation on the Web
Perhaps Animated PNG’s can help the supplement the load of Flash banners for non-Flash platforms. PNG (Portable Network Graphics) is an awesome format when it comes to a solution for raw transparency on the web static or not. Many 3D authoring tools have taken advantage of PNG animation for years, Adobe Fireworks has native support for PNG, and the Animated PNG format is completely backwards compatible. If modern browsers are going to support the HTML 5 and CSS 3 standards why not Animated PNG’s?
Animated GIF versus Animated PNG