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If I post a lovely animated SVG here, it will animate:
Beautiful, but the same does not happen in chat for me (Chrome, Mac OS):
This is a serious bug which needs fixing immedia-- ALL GLORY TO THE HYPNOTOAD
It looks like an issue with Chrome. There's no problem with Firefox.
On the other hand, SVG animations in Chrome/WebKit are still not well supported/have bugs.
For example, try the w3.org test in both browsers.
See also: https://bugs.webkit.org/show_bug.cgi?id=21371
It seems that it's not an issue with chat playing the animation, because if you load a chat room with an animation it will play, but if posted while you're already in the room.
I assume the issue is that chat is not telling the browser to play the graphic when it is loaded.