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原始整图
body
{font: 10pt Arial;}
#nav li {
display:inline;
list-style-type:none;
font-size:1em;
font: 12pt Arial;
}
#nav li a {
background-image:url('image1.gif');
background-repeat:no-repeat;
padding:10px 35px;
line-height:40px;
}
#nav li a.option1 {background-position:0px 0px;}
#nav li a:hover.option1 {background-position:0px -50px;}
#nav li a.option2 {background-position:0px -100px;}
#nav li a:hover.option2 {background-position:0px -150px;}
#nav li a.option3 {background-position:0px -200px;}
#nav li a:hover.option3 {background-position:0px -250px;}
#nav li a.option4 {background-position:0px -300px;}
#nav li a:hover.option4 {background-position:0px -350px;}
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>CSS Sprites - by Assad Baig</title>
<link rel="stylesheet" type="text/css" href="Sprites.css"/>
</head>
<body>
<ul id="nav">
<li><a class="option1" href="#">Print</a></li>
<li><a class="option2" href="#">Add to Favorites</a></li>
<li><a class="option3" href="#">Email to a Friend</a></li>
<li><a class="option4" href="#">Download</a></li>
</ul>
<br />
<br />
<br />
<br />
<br />
<p>(Roll your mouse over the links to see image transitions.)</p>
<p>Please note:
<ul>
<li><b>Only 1 image is used</b> to display 4 gray icons + 4 mouse over colored icons.</li>
<li>One gif file means only <b>One HTTP request</b></li>
<li>Yahoo uses similar technique (<a href="EXAMPLE_YAHOO_10MAY2008.png">Click to see Yahoo Example</a>) or try <a href="http://us.i1.yimg.com/us.yimg.com/i/ww/t7/pa-icons2.gif">live one</a>.</li>
</ul>
</p>
<br />
</body>
</html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>DTD - Example</title>
.....
</head>
<body>
.......
</body>
</html>

html>
<head>
<title>Cache - Example</title>
<meta http-equiv="Expires" content="Sat, 16 Jul 2016 18:45:00 GMT">///附带expires头,
.....
</head>
<body>
.......
</body>
</html>
<html>


