HTML 纯CSS浮窗兼容IE6+
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>HTML 纯CSS浮窗兼容IE6+</title>
<style>
/* body容器设置 */
body {
/* IE6中需要为body添加如下两个样式属性，才能完美实现固定浮动 */
_background-attachment: fixed;
_background-image: url(about:blank);
}
/* 固定浮动 */
.fix-top {
position: fixed;
_position: absolute; /* 兼容IE6 */
right: 0;
bottom: 20px;
z-index: 99;
/* 兼容IE6，_top属性的表达式可能根据浮动的位置不同而所有不同，请自行更改 */
_bottom: auto;
_top: expression( document.documentElement.scrollTop + document.documentElement.clientHeight - this.offsetHeight - 20 );
/*浮窗的样式*/
width: 40px;
height: 40px;
background: #f60;
text-align: center;
line-height: 20px;
color: #fff;
text-decoration: none;
}
</style>
</head>
<body>
<div style="height: 1500px">阅谁问君诵，水落清香浮</div>
<a class="fix-top" href="#">回到顶部</a>
</body>
</html>
效果图：
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