Lets do APNG!
For web developers Alpha/Animated PNG will be the smart and easy tool to reach native 32bit-alpha animation effects!
Firefox and Opera Presto can it a long time, and from 2014 Safari joined to support this smart format.
Edge, IE, lets do it too!
So, Chrome will forced to support it too, and thier WebM will grow as parallel issue.
WebM is in development – http://dev.modern.ie/platform/status/webmcontainer/
Opus is now in preview builds behind a flag. Please see https://blogs.windows.com/msedgedev/2016/04/18/webm-vp9-and-opus-support-in-microsoft-edge/