Shame. Edge is the only (popular) browser which doesn't support APNG: https://caniuse.com/#search=apng
Marat Tanalin, it's OK to use it on web pages for small animations. Edge doesn't support it, but it is not a problem. Edge users will see just a static image.
Chrome 59+, Safari 8+ and Firefox 3+ support APNG. When Edge will support it?
Chromium developers are implementing APNG support:
APNG support for Chromium: https://codereview.chromium.org/1250373006/
There are only ≈500 additional lines of code.
CSS Box Alignment is now on the Microsoft Edge backlog. You can track the status at https://dev.modern.ie/platform/status/boxalignment/
I've created similar ticket in the Chromium bugtracker:
The main advantage of the arithmetic coded JPEGs over other new formats is that you can recompress all your JPEGs losslessly. And often it reduces the size of an image for even more than 10%.
WebM is in development – http://dev.modern.ie/platform/status/webmcontainer/
Also it would be nice if IE will support Ogg Vorbis and Opus audio formats. They are a part of WebM and are used for audio. http://wpdev.uservoice.com/forums/257854-internet-explorer-platform/suggestions/6513488-ogg-vorbis-and-opus-audio-formats-support-firefox
Unfortunately JPEG-XR doesn't support animated images. If WebP is too hard to implement maybe it is possible to implement at least support of APNG? Safari 8 and Firefox support it. http://wpdev.uservoice.com/forums/257854-internet-explorer-platform/suggestions/6513393-apng-animated-png-images-support-firefox-and-sa