随着网络的发展，CSS 也在不断的完善，充分吸取多年来 Web 发展的需求，提出了很多新颖的 CSS 特性，例如很受欢迎的圆角矩形 border-radius 属性，但很可惜，此属性目前没有得到任何浏览器的支持。
对于一些浏览器，它们有其私有的圆角属性。如 FF 的 -moz-border-radius ，Safari 和 Chrome 的 -webkit-border-radius 。效果见下图：
FF 的圆角
Safari 和 Chrome 的圆角(Safari 和 Chrome 使用的是同一种内核，这里就只附 Chrome 的效果了)
IE 和 Opera 就没有私有的圆角属性了，如果有的话，那制作圆角应该就简单多了，把各自的私有属性全部写上，让各个浏览器“对号入座”，就达到了“兼容”的效果。
下面给出一个百度有啊CSS圆角方案的示例：
XML/HTML Code
-
圆角一
CSS 代码：
JavaScript Code
.box1 {
background:url(images/bg1.gif) repeat-x #1d6cb7;
margin-top:1em;
position:relative;
zoom:1;
width:778px;
}
.box1 .tl, .box1 .tr, .box1 .bl, .box1 .br {
width:5px;
height:5px;
position:absolute;
background:url(images/bg3.gif) no-repeat;
overflow:hidden;
}
.box1 .cc {
height:40px;
padding:5px;
}
.box1 .tl {
left:0;
top:0;
}
.box1 .tr {
right:0;
top:0;
background-position:0 -5px;
}
.box1 .bl {
left:0;
bottom:0;
background-position:0 -10px;
}
.box1 .br {
right:0;
bottom:0;
background-position:0 -15px;
}
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