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!
![9 More Mind-Blowing WebGL Demos]()
With Firefox OS, asm.js, and the push for browser performance improvements, canvas and WebGL technologies are opening a world of possibilities. I featured 9 Mind-Blowing Canvas Demos and then took it up a level with 9 Mind-Blowing WebGL Demos, but I want to outdo...
![An Interview with Eric Meyer]()
Your early CSS books were instrumental in pushing my love for front end technologies. What was it about CSS that you fell in love with and drove you to write about it?
At first blush, it was the simplicity of it as compared to the table-and-spacer...
![Create a Context Menu with Dojo and Dijit]()
Context menus, used in the right type of web application, can be invaluable. They provide shortcut methods to different functionality within the application and, with just a right click, they are readily available. Dojo's Dijit frameworks provides an easy way to create stylish, flexible context...
![PHP / MooTools 1.2 Accordion Helper]()
The MooTools Accordion plugin seems to be the plugin that people seem to have the most problems with. It's an awesome plugin, so I can see why so many people want to use it, but I think that may be part of the problem.
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