<!DOCTYPE html>
<html>
<head>
<title>Xem ví dụ</title>
<style type="text/css">
div{
width:300px;
height:200px;
border:20px solid transparent;
border-image-source:url(../image/pattern4.png);
border-image-slice:50 50 50 50;
border-image-width:20px;
}
</style>
</head>
<body>
<div>
<h1>Lập Trình Web</h1>
</div>
</body>
</html>
10px
20px
20%
3
auto