Animations that change opacity, need the final opacity declared on the last key frame too

[behrangsa]

Hi,

Please compare this and this to see what I mean.

In the first one, I have modified animate.css so that the opacity is set to 1 on the final key frame, even though it already gets set to this value in an earlier key frame. This makes the element to which this animation is applied retain the final opacity.

Here's the JS Fiddle code:

<div id="foo">
</div>​

#foo {
    opacity: 0;
    position: absolute;
    width: 100px;
    height: 200px;
    top: 10px;
    left: 10px;
    border: 1px solid black;
}

/*
Animate.css - http://daneden.me/animate
LICENSED UNDER THE  MIT LICENSE (MIT)

Copyright (c) 2012 Dan Eden

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

.animated {
    -webkit-animation-fill-mode: both;
    -moz-animation-fill-mode: both;
    -ms-animation-fill-mode: both;
    -o-animation-fill-mode: both;
    animation-fill-mode: both;
    -webkit-animation-duration: 1s;
    -moz-animation-duration: 1s;
    -ms-animation-duration: 1s;
    -o-animation-duration: 1s;
    animation-duration: 1s;
}

.animated.hinge {
    -webkit-animation-duration: 2s;
    -moz-animation-duration: 2s;
    -ms-animation-duration: 2s;
    -o-animation-duration: 2s;
    animation-duration: 2s;
}

@-webkit-keyframes bounceIn {
    0% {
        opacity: 0;
        -webkit-transform: scale(.3);
    }

    50% {
        opacity: 1;
        -webkit-transform: scale(1.05);
    }

    70% {
        -webkit-transform: scale(.9);
    }

    100% {
        -webkit-transform: scale(1);
    opacity: 1;
    }
}

@-moz-keyframes bounceIn {
    0% {
        opacity: 0;
        -moz-transform: scale(.3);
    }

    50% {
        opacity: 1;
        -moz-transform: scale(1.05);
    }

    70% {
        -moz-transform: scale(.9);
    }

    100% {
        -moz-transform: scale(1);
    opacity: 1;
    }
}

@-o-keyframes bounceIn {
    0% {
        opacity: 0;
        -o-transform: scale(.3);
    }

    50% {
        opacity: 1;
        -o-transform: scale(1.05);
    }

    70% {
        -o-transform: scale(.9);
    }

    100% {
        -o-transform: scale(1);
    opacity: 1;
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(.3);
    }

    50% {
        opacity: 1;
        transform: scale(1.05);
    }

    70% {
        transform: scale(.9);
    }

    100% {
        transform: scale(1);
    opacity: 1;
    }
}

.bounceIn {
    -webkit-animation-name: bounceIn;
    -moz-animation-name: bounceIn;
    -o-animation-name: bounceIn;
    animation-name: bounceIn;
}
​```


```javascript
$(document).ready(function() {
    $("#foo").addClass("animated bounceIn");
});​

[daneden]

The reason you're having to set the final keyframe is because you're applying opacity: 0; to the element itself. Instead, use -prefix-animation-fill-mode: both; - this will apply the first keyframe before the animation starts (opacity: 0;) and the last keyframe when it finishes, ensuring that the element is invisible to begin with, and visible once the animation ends.

[behrangsa]

This turned out to be a WebKit bug actually: https://bugs.webkit.org/show_bug.cgi?id=91322