问可以使用CSS3缩放背景吗？

EN

.selector {
    background-image: url(http://path/to/image.png);
    background-size: 200px 100px;
}

background-size: 200px;
background-size: 200px 100px;
background-size: 200px 100px, 400px 200px;
background-size: auto 200px;
background-size: 50% 25%;
background-size: contain;
background-size: cover; 

 (or)

img.bg {
    /* Set rules to fill background */
    min-height: 100%;
    min-width: 1024px;

    /* Set up proportionate scaling */
    width: 100%;
    height: auto;

    /* Set up positioning */
    position: fixed;
    top: 0;
    left: 0;
}

@media screen and (max-width: 1024px) { /* Specific to this particular image */
    img.bg {
        left: 50%;
        margin-left: -512px;   /* 50% */
    }
}



       (or)


    #bg {
        position:fixed; 
        top:0; 
        left:0; 

        /* Preserve aspet ratio */
        min-width:100%;
        min-height:100%;
    }