APNG
APNG（Animated Portable Network Graphics）格式是PNG的位图动画扩展，但未获PNG组织官方认可。它的扩展方法类似GIF 89a，仍对原版PNG保持向下兼容。APNG第1帧为标准PNG图像，剩余的动画和帧速等数据放在PNG扩展数据块里，因此只支持原版PNG的软件会正确显示第1帧。APNG与Mozilla社区关系密切，格式标准文档设置在Mozilla网站。
APNG
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APNG
The Animated Portable Network Graphics (APNG) file format is an extension to the Portable Network Graphics (PNG) specification. It allows for animated PNG files that work similarly to animated GIF files, while supporting 24-bit images and 8-bit transparency not available for GIFs. It also retains backward compatibility with non-animated PNG files.