APNG
From Just Solve the File Format Problem
APNG is an unofficial extension of the PNG image format. It supports animation similar to animated GIF. The Mozilla Corporation was involved in its development.
APNG files are valid PNG files. When an APNG file is viewed in a program that does not support the APNG extensions, it will appear as a still image chosen by the creator of the APNG file.
APNG supports 24-bit color and 8-bit transparency, whereas GIF supports 256 colors per image palette and binary transparency.
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Browser support
APNG is supported on Mozilla Firefox as of version 3.0 (June 17, 2008) and on Opera (Presto layout engine) as of version 9.5 (June 12, 2008). Internet Explorer and Safari do not support APNG. Blink layout engine based browsers Google Chrome and (post version 15) Opera require an add-on to render APNG files.
