Whenever the the animation plug-in is finished, having support for these would be a good idea.
APNG might be a problem, it's hardly supported anywhere.
Part of the 2015 accepted stretch goal.
APNG is supported in chrome nowadays :D:D:D
I'll check this summer how difficult it'll be to add apng export.
It's been a while. Maybe this option should be revisited?
It shouldn't be too difficult to implement it. We just need to pass proper arguments to FFMPEG to encode the frames into APNG.
Alternatively, we can make use of a patch by Mozilla to extended our PNG support.
As Mozilla created the APNG specification, it's reasonable to make use of this code.
It's already implemented via ffmpeg.