CSS animation-fill-mode
We're always super excited to get into CSS animations because, quite frankly, they're incredibly awesome. One overlooked animation property, however, is the animation-fill-mode
property. This CSS property sets the state of the end animation when the animation is not running. Here's a quick example:
@keyframes fadeIn{
0% { opacity: 0 }
100% { opacity: 1 }
}
.fadeIn {
animation-name: fadeIn;
animation-duration: 1s;
animation-fill-mode: forwards;
}
In the case of my fadeIn animation, I want the element to stay at an opacity of 1 when the animation is complete. If I don't set the value to forwards, the element would go back to an opacity of 0 after the animation runs. In most cases, you'll likely want the the value of animation-fill-mode
to be forwards, so don't forget to add it!
![I’m an Impostor]()
This is the hardest thing I've ever had to write, much less admit to myself. I've written resignation letters from jobs I've loved, I've ended relationships, I've failed at a host of tasks, and let myself down in my life. All of those feelings were very...
![Create a CSS Cube]()
CSS cubes really showcase what CSS has become over the years, evolving from simple color and dimension directives to a language capable of creating deep, creative visuals. Add animation and you've got something really neat. Unfortunately each CSS cube tutorial I've read is a bit...
![CSS Scoped Styles]()
There are plenty of awesome new attributes we've gotten during the HTML5 revolution: placeholder, download, hidden, and more. Each of these attributes provides us a different level of control over an element on the page, but there's a new element attribute that allows...
![Create a Dojo Lightbox with dojox.image.Lightbox]()
One of the reasons I love the Dojo Toolkit is that it seems to have everything. No scouring for a plugin from this site and then another plugin from that site to build my application. Buried within the expansive dojox
namespace of Dojo is
Indeed, animation-fill-mode defaults to “none”, which means no animation style is applied when the animation starts or ends. You could expect “forwards” to be the default one, but… nope.
The other values are “backwards” and “both”. Cue to MDN page:
https://developer.mozilla.org/en-US/docs/Web/CSS/animation-fill-mode
> You could expect “forwards” to be the default one, but… nope.
This is why Max: http://www.w3.org/TR/css3-animations/
> The keyframes specify the behavior of one cycle of the animation… If a 0% or “from” keyframe is not specified, then the user agent constructs a 0% keyframe using the computed values of the properties being animated. If a 100% or “to” keyframe is not specified, then the user agent constructs a 100% keyframe using the computed values of the properties being animated.
> …by default an animation does not affect property values after the animation ends. The ‘animation-fill-mode’ property can override this behavior.
So, it is assumed that the non-animated state is the ‘default’ resting state for the animation.
This definitely helped me out a few times. I also like the “animation-direction” property, it can lead to interesting effects: http://cdpn.io/Kdslg