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Now if APNG would gather some steam, high quality animated fully alpha transparent images would be nice. Gif's 256 color and 1 level transparency is ok, but to do better work we need something like APNG, although not sure how well it compresses.

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Use VP9, which is literally 15 times smaller. It supports alpha transparency, too.

VP8 has Alpha built-in and works in ffmpeg, VP9 IIRC this could be implemented but I don't know if there are implementations out there

Pretty sure APNG is supported now in all browsers except Edge and IE. So not quite there yet, but we're getting close.

Doesn't work in Chrome for Android either: https://caniuse.com/#search=apng.

Are you sure that's accurate? Chrome Platform Status says it's enabled by default in Chrome 59 on Android: https://www.chromestatus.com/feature/6691520493125632

>except Edge and IE //

Any ideas why?

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