css animation

I first got the idea to CSS something of the kind when I saw this gradient infinity logo by Infographic Paradise. The gradient doesn't look like in the original illustration, as I chose to generate the rainbow logically instead of using the Dev Tools picker or something like that, but other than that, I think I got pretty close—let's see how I did that!

Back in 2012, Internet Explorer 10 came out and, among other things, it finally supported CSS gradients and, in addition to that, the ability to animate them with just CSS! No other browser supported this at the time, but I was hopeful for the future.

Sadly, six years have passed and nothing has changed in this department. Edge supports animating gradients with CSS, just like IE 10 did back then, but no other browser has added support for this. And while animating background-size or background-position or the opacity or rotation of a pseudo element layered on top can take us a long way in terms of achieving cool effects, these workarounds are still limited.

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It used to be that designers designed and coders coded. There was no crossover, and that’s the way it was. But with the advent of CSS transitions and animations, those lines are blurring a bit. It’s no longer as simple as the designer dictating the design and the coder transcribing—designers must now know something about code, and coders must know something about design in order to effectively collaborate.

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The following is a guest post by Zach Saucier. Zach wrote to me telling me that, as a frequenter on coding forums like Stack Overflow, he sees the questions come up all the time about controlling CSS animations with JavaScript, and proved it with a bunch of links. I've had this on my list to write about for way too long, so I was happy to let Zach dig into it and write up this comprehensive tutorial.

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