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Do not autoplay/repeat GIFs in link embeds #3021
easier said than done because you need to have a gif parser on the server, and even then, it will only work if you have prefetch storage enabled.
Using canvas on the client like all of the gif pausing libraries seem to do should be better overall.
I think it's fine to be able to stop a repeating gif, but I'd prefer to keep them playing by default. It's frustrating to share memes and expect viewers to click on them individually :D
Slack doesn't support stopping a GIF, and I personally took the habit of collapsing them when I have viewed them and/or find them distracting. I tend to do the same on TL