VP9 has lossless encoding support. http://base-n.de/webm/VP9lossless.html | Hacker News

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sb057 on March 16, 2015 | parent | context | favorite | on: High quality GIF with FFmpeg

VP9 has lossless encoding support.

http://base-n.de/webm/VP9lossless.html

leeoniya on March 16, 2015 [–]

apparently there's also hints of alpha channel, but basically no support for it outside of chrome's experimental flags:

http://updates.html5rocks.com/2013/07/Alpha-transparency-in-...

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