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google chrome浏览器页签的css实现

Google Chrome浏览器的页签比较特别的是激活页签能“吃”掉旁边非激活页签的一部分。这对css提出了一些挑战。如下图:

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当然,要求是只能使用两张图,宽度自适应,用到的图:

正常页签背景:\

激活页签背景:\
代码: <!DOCTYPE HTML>
<head>
    <title>google chrome tab</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
    /*易做图 reset*/
    *{padding:0px;margin:0px;}
    /*clearfix*/
    .clearfix:after {content: ".";display: block;height: 0;clear: both;visibility: hidden;}
    .clearfix {display: inline-block;}  /* for IE/Mac */

   
    #tab { font-size:12px;margin-left:40px;_margin-left:60px;}/*由于li有margin-left:-15px;所以tab的margin-left>15px;*/
    /*margin-left:-15px; 让当前元素“缩进”到前一个元素的右侧*/
    #tab  li{float:left; display:block; height:26px;position:relative;margin-left:-15px;_margin-left:-30px;z-index:1;}
    #tab  li a{color:#000; text-decoration:none; display:block;_float:left;_position:relative;_left:15px; height:26px;padding-left:30px;padding-right:15px; line-height:26px;margin-right:15px; background:url(normal.gif) no-repeat left top;}
    /*i置于右边*/
    #tab li i{position:absolute; right:0px;top:0px; width:15px;height:26px; z-index:3;background:url(normal.gif) no-repeat right top;}

    /*当前激活的li在非激活之上(z-index)*/
    #tab  .active{z-index:2;top:1px; }
    #tab  .active a{background:url(active.gif) no-repeat left top; }
    #tab  .active i{background:url(active.gif) no-repeat -197px top;}
    .content{clear:both;border:solid 1px #bcc5d1;}

</style>
</head>
<body>
<ul id="tab">
    <li><a href="###">页签1</a><i></i></li>
    <li class="active"><a href="###">页签页签页签页签2</a><i></i></li>
    <li><a href="###">页签3</a><i></i></li>
</ul>
<div id="" class="content">
    content
</div>
<script type="text/javascript">
    //添加事件
     var addHandler = window.addEventListener?
    function(elem,event,handler){elem.addEventListener(event,handler,false);}:
    function(elem,event,handler){elem.attachEvent("on"+event,handler);};

    //实现.active切换
    addHandler(window,"load",function(){
        var arrLi = document.getElementById("tab").getElementsByTagName("li");
        for (var i=0,l=arrLi.length;i<l ;i++ ){
            (function(index){
                addHandler(arrLi[index],"click",function(e){
                    var evt = (window.event||e),cur=evt.target||evt.srcElement;
                   
                    for (var j=0,jl=arrLi.length;j<jl ;j++ ){
                        arrLi[j].className="";
                    }
                    ((cur.tagName.toLowerCase()=="a")?cur.parentNode:cur).className="active";
                    try{cur.blur();cur.parentNode.blur();}catch(e){}
                });
            })(i);
        }
    });
</script>
</body>
</html>

 

补充:web前端 , HTML/CSS  ,
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