这个属性官方文档语法：
实例代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 10px;
}
.a{
float: left;
height: 200px;width: 200px;
border: 10px dashed royalblue;
padding: 20px;
background-color: #F08080;
/*background: url(img/HBuilder.png) no-repeat;*/
background-clip:padding-box;
}
.b{
float: left;
height: 200px;width: 200px;
border: 10px dashed royalblue;
padding: 20px;
background-color: #F08080;
/*background: url(img/HBuilder.png) no-repeat;*/
background-clip:border-box;
}
.c{
float: left;
height: 200px;width: 200px;
border: 10px dashed royalblue;
padding: 20px;
background-color: #F08080;
/*background: url(img/HBuilder.png) no-repeat;*/
background-clip:content-box;
}
.d{
float: left;
height: 200px;width: 200px;
border: 10px dashed royalblue;
padding: 20px;
background-color: #F08080;
/*background: url(img/HBuilder.png) no-repeat;*/
}
</style>
</head>
<body>
<div class="a">padding</div>
<div class="b">border</div>
<div class="c">content</div>
<div class="d">默认=border</div>
</body>
</html>
效果如下：