不透明属性的简单(？)CSS动画

Question

好的,我没有得到这个.我以前做过CSS3动画,但出于某种原因,简单地设置不透明度动画对我今天起作用.我错过了一些傻事吗？

CSS:

@-webkit-keyframes fadein {
    from: { opacity: 0; }
    to: { opacity: 1; }
}

@-moz-keyframes fadein {
    from: { opacity: 0; }
    to: { opacity: 1; }
}

@keyframes fadein {
    from: { opacity: 0; }
    to: { opacity: 1; }
}

#foo {
    background-color: green;
    color: white;
    -webkit-animation: fadein 2s ease-in alternate infinite;
    -moz-animation: fadein 2s ease-in alternate infinite;
    animation: fadein 2s ease-in alternate infinite;
}

HTML:

<div id="foo">This is Foo!</div>

我还发布它作为小提琴:http: //jsfiddle.net/NRutman/Lcyvy/

任何帮助,将不胜感激.

谢谢,-Nate

Answer 1

你不需要冒号后from和to:

@keyframes fadein {
    from { opacity: 0; }
    to { opacity: 1; }
}

http://jsfiddle.net/Lcyvy/6/

Answer 2

改变

@keyframes fadein {
    from: { opacity: 0; }
    to: { opacity: 1; }
}

到

@keyframes fadein {
    0%   { opacity: 0; }
    100% { opacity: 1; }
}

演示