This part of the Opera 46 release notes got me very excited:
Opera now supports animated PNG, or APNG for short. APNG is a file format that works similarly to GIF. The difference is that APNG is smaller and supports both 24-bit images and 8-bit transparency.
Ever since APNG landed in Firefox (10 years ago to be precise, with the release of Firefox 3) I’ve been waiting for other browsers to implement support for this format too: animated images with true transparency, what’s not to like?!
Great to see that Opera now supports it (again). Safari already supports it, as does the latest version of Chrome (Chrome 59).
Edge has no support, but you can upvote the issue on UserVoice (which you should).