The APNG specification has been around for more than one decade and it's been supported in Firefox since 2007 (Firefox 3) and has been supported in WebKit since 2015. Google's Chrome has been notably absent in their APNG support along with Microsoft Edge/IE. But now, finally, we are seeing APNG support for Chrome/Chromium so perhaps in the not too distant future it will finally replace GIF as the dominant file format for animated images.
Landing today in the Chromium code-base was the APNG support. Great to see this finally happen.