But what does it help if it is better than gif if most browsers don't support it at all? We had never any request for apng support before so there is non built in. I never used or encountered them in the wild I think. Even my Photoshop CS6 can't create them. Feel free to open a ticket about that so we maybe look into it for later.
You probably can use the anyfile plugin to use apngs but that will not support resizing. Imagick might but I am sure GD does not. That is a server thing.
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I don't think providing apng is a good idea as the browser support is pretty bad
http://caniuse.com/#feat=apng
I guess I'll just use wordpress for an animation gallery since that resizes apngs well.
Though honestly the theme I use probably wouldn't have handled animations very well so it's a moot point.
You probably can use the anyfile plugin to use apngs but that will not support resizing. Imagick might but I am sure GD does not. That is a server thing.