html_code_20 在线代码实例

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<!DOCTYPE html>
<html>
<head> 
    <meta charset="utf-8"> 
    <title>W3Cschool教程(w3cschool.cn)</title> 
    <style> 
        body{background-image:url(/statics/images/course/pulpit.jpg); 
            background-repeat:no-repeat; 
            background-position:center;
            background-attachment: fixed} 
</style>
</head>
<body">
    <p>拉动页面时背景图不动</p>
    <p style="padding-top:1800px;">拉动页面时背景图不动</p>
</body>
</html>
 
 
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运行结果
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