CSS3 или HTML5 - как сделать фоновую анимацию, например облака, плавающие на страницах HTML5?

Fiddle DEMO

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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Рекомендации

@keyframes

анимация:

анимации