最佳答案
background：0是有效的css并被编译成：
原文链接：https://www.f2er.com/css/427359.htmlbackground-image: initial;
background-position-x: 0px;
background-position-y: 50%;
background-size: initial;
background-repeat-x: initial;
background-repeat-y: initial;
background-attachment: initial;
background-origin: initial;
background-clip: initial;
background-color: initial;
