Javascript CSS3或HTML5-如何制作背景动画，如HTML5页面中漂浮的云？

我只是想知道是否有一种方法可以在纯基于CSS3的设计中使用一点HTML5或jquery来制作背景动画

我可以看到一些人这样做

在CSS3中有没有简单的方法可以做到这一点？

CSS

@keyframes animatedBackground {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 100% 0;
    }
}
@-webkit-keyframes animatedBackground {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 100% 0;
    }
}
@-ms-keyframes animatedBackground {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 100% 0;
    }
}
@-moz-keyframes animatedBackground {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 100% 0;
    }
}
#wrap {
    height:100%;
    width:100%;
    background: url(http://addtwitter-followers.com/wp-content/themes/twentyten/images/bck.jpg) top no-repeat #94E3F4;
    background-position: 0px 0px;
    background-repeat: repeat-x;
    animation: animatedBackground 150s linear infinite;
    -ms-animation: animatedBackground 150s linear infinite;
    -moz-animation: animatedBackground 150s linear infinite;
    -webkit-animation: animatedBackground 150s linear infinite;
}

HTML

<div id="wrap">...</div>

。。。

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参考资料