6/10/2023 0 Comments Css animations![]() If it does, a number of CSS transition classes will be. The Big Boo has its z-index animated from 1 to 6, moving it in front of each wall, before alternating back to move behind each wall. While I can play the animation when scrolled to the view/section, the animated elements first appear and then start animation from opacity 0 to 1. Vue will automatically sniff whether the target element has CSS transitions or animations applied. There are 5 walls, each with a z-index of 1 through 5. See the Pen Spooky Boo! by Will Boyd ( on CodePen. Here’s an example with Big Boo floating through walls. You can animate z-index to achieve layered animations. If we look beyond properties with obvious gradual visual transitions, we’ll find that a lot of unexpected properties can be animated, either discretely or with unique interpolations. In other words, if there’s not a sensible way to gradually interpolate from the start value to the end value, then just switch between them halfway through.Īnd there’s our spark. The property’s values cannot be meaningfully combined, thus it is not additive and interpolation swaps from V a to V b at 50% (p=0.5)… This is known as a discrete animation and the W3C Web Animations working draft describes the behavior as follows: You can write code for a CSS animation in less than a minute without knowing anything single line of JavaScript. And third, they are deceptively easy to implement. Secondly, they are natively supported by all browsers. But for everyone else, you can see the text flip from “div” to “DIV”. CSS animations are performant in comparison to animations done by JavaScript. Something happened! Unless you’re using Safari (sorry). See the Pen Interpolation Widget (text-transform) by Will Boyd ( on CodePen. What happens if we try to animate text-transform from lowercase to uppercase? We only get integers, which makes sense for z-index.Īlright, let’s do something wacky. What’s interesting is that we don’t see any decimal points like we did for height. Yes, you can animate z-index! It’s not visually apparent in this demo, but seeing the interpolated values go from 1 to 5 confirms it. See the Pen Interpolation Widget (z-index) by Will Boyd ( on CodePen. ![]() Interpolating height values from 80px to 160px is straightfoward: it’s a series of incremented values. The results are pretty much what you’d expect. See the Pen Interpolation Widget (height) by Will Boyd ( on CodePen. Keyframes - define the stages and styles of the animation. Here’s a widget that will animate height on a and show the interpolated values during the animation. CSS animations are made up of two basic building blocks. When your browser animates a CSS property, it creates a sequence of intermediate values over the course of the animation. This articles explores some of the unexpected things that CSS can animate and some nifty things you can do by animating them. When you think of animating CSS properties, which ones come to mind? I recently started wondering about the ones that don’t come to mind - properties that aren’t typically associated with animation, but turn out to be animatable.
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