what is wrong with this picture?
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"Animating" with CSS used to be limited to hovering effects.
Anyone remember Color cycling from the 90s? This was a technology often used in 8-bit video games of the era, to achieve interesting visual effects by cycling (shifting) the color palette. Back then video cards could only render 256 colors at a time, so a palette of selected colors was used.
You know how people sometimes say that jazz is the only truly American art form? Animated GIFs are like the jazz of the internet: they could only exist, and be created and appreciated, online. That said, PopTart Cat is not exactly on par with Thelonious Monk.