css渐变色兼容性写法

 background: -webkit-linear-gradient(left, #0f0f0f, #0c0c0c, #272727);
             /* Safari 5.1 - 6.0 */
 background: -o-linear-gradient(left, #0f0f0f, #0c0c0c, #272727);
             /* Opera 11.1 - 12.0 */
 background: -moz-linear-gradient(left, #0f0f0f, #0c0c0c, #272727);
             /* Firefox 3.6 - 15 */
 background: linear-gradient(to right, #0f0f0f, #0c0c0c, #272727);
             /* 标准的语法 */