CSS animations are failing to work properly in Firefox due to a pseudo-element issue

I'm encountering a problem with my CSS animations in Firefox. Specifically, the animations are not working on a pseudo element (:after) while they work perfectly fine on other browsers.

Below is where the animations are being applied:

:after
{
    display:block;
    background:url('../img/snow.png'), url('../img/snow2.png') ;
    -webkit-animation: snow 15s linear infinite;
    -moz-animation: snow 15s linear infinite;
    -ms-animation: snow 15s linear infinite;
    animation-name:snow;
    animation-duration:15s;
    animation-timing-function:linear;
    height:500px;
    width:100%;
    content:'';
    position:absolute;
    top:0;
    left:0;
}

Here are the animations themselves:

@-webkit-keyframes snow {
 0% {background-position: 0px 0px;}
 100% {background-position: 0px 1000px, 0 500px;}
}
@keyframes snow {
 0% {background-position: 0px 0px;}
 100% {background-position: 0px 1000px, 0 500px;}
}

@-moz-keyframes snow {
 0% {background-position: 0px 0px;}
 100% {background-position: 0px 1000px, 0 500px;}
}
@-ms-keyframes snow {
 0% {background-position: 0px 0px;}
 100% {background-position: 0px 1000px, 0 500px;}
}

If anyone has any insights or advice on how to fix this issue in Firefox, I would greatly appreciate it!

Answer №1

The problem you are facing is due to the different-length lists for background-position in your keyframes. It seems that Gecko does not support interpolation between backgrounds with different lengths. I have reported this issue here.

Meanwhile, a simple solution would be to use the following code snippet in your keyframes:

0% {background-position: 0px 0px, 0px 0px;}

This should resolve the issue you are experiencing.

Answer №2

Occasionally, when your firebug or another web developer tool is activated, the CSS may not function properly.

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