Most (okay, nearly all) of these animations are very basic, but technically they are all animations because they involve more than just a single, static image. The gifs should work on pretty much any browser, but in order to see the animated pngs do their thing you will need to use a browser which supports them, which now means just about anything except for the Microsoft ones. The APNGs also don’t work for the thumbnails, so you will need to click on them.

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