.box
{
opacity:0.5; -moz-opacity:0.5 ; filter:alpha(opacity=50)
}
综上练习实例：做毒霸网址大全的部分格式布局
html代码：
XML/HTML Code复制内容到剪贴板
<!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>无标题文档</title>
<style type="text/css">
.a
{
border:5px solid blue;
width:1000px;
height:100px;
margin:10px;
left:150px;
top:80px;
position:absolute;}
.b
{
border:5px solid blue;
width:240px;
height:200px;
margin:10px;
left:150px;
top:200px;
position:absolute;}
.c
{
border:5px solid blue;
width:740px;
height:300px;
margin:10px;
left:410px;
top:200px;
position:absolute;}
.d
{
border:5px solid blue;
width:740px;
height:200px;
margin:10px;
left:410px;
top:520px;
position:absolute;}
.e
{
border:5px solid blue;
width:240px;
