I think now, in 2010s most of internet content is made by regular users, not
webdevs. Can we look at the problem from their perspective? Of course, CDNs and
webdevs care about MIME types and Accept headers, but regular users know
nothing about that and they've been happily posting apngs to Tumblr and
DeviantArt for years now:
http://patakk.tumblr.com/post/42213491263
http://kokotea.deviantart.com/art/AT-kia-animated-PNG-519985556
http://www.deviantart.com/art/Lifealope-293147967
http://apngden.tumblr.com/
They simply tell their visitors: "you can use Firefox, or click here for APNG
extension for Chrome, or click here for the GIF version". Judging by the
comments, viewers seems to figure it out quickly.
So what would happen if APNG support lands into Chrome "as is" and only IE/Edge
is left out? These artistic types would keep posting that stuff, only a bit
more often. What about CDNs and webdevs of big websites? Maybe a few of them
would UA-sniff IE/Edge, but most won't bother they'll keep using GIFs. A few
might switch to APNG exclusively, but that's hard to predict.
I think the net effect would be slightly positive.
And if Edge devs would follow soon enough, the whole thing could be moot,
quickly. Three-way negotiations seems harder to achieve than convincing just
one more player.
Max.
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