HTML – 如何在没有图像的情况下制作渐变背景？

.gradient{
    /* For any browser that can't create a gradient  */
    BACkground-color: #EFEFEF;
    /*//mozilla*/
    BACkground: -moz-linear-gradient(top,#efefef,#FFF);
    /* Chrome/Safari     */
    BACkground: -webkit-gradient(linear,left top,left bottom,from(#EFEFEF),to(#FFF));
    /*IE 6/7 */ filter:progid:DXImageTransform.Microsoft.Gradient(GradientType=0,StartColorStr='#EFEFEF',EndColorStr='#FFF');
    /*IE 8 */
    -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#EFEFEF,endColorstr=#FFF)";
}