认识
Animated Portable Network Graphics (APNG) is a file format which extends the Portable Network Graphics (PNG) specification to permit animated images that work similarly to animated GIF files, while supporting images with a higher color depth and full alpha transparency not available for GIFs. It also retains backward compatibility with non-animated PNG files.
构建
查看 APNG 图片：Firefox，Google Chrome，……
参考
Wikipedia / APNG / https://en.wikipedia.org/wiki/APNG