id选择器只能有一个，具体是指什么，这个代码不是设置了两个id吗
<style type="text/css">
div{
width:300px;
height:300px;
border:1px solid red;
}
</style>
</head>
<body>
<div id="box1">box1</div>
<div id="box2">box2</div>
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<style type="text/css">
div{
width:300px;
height:300px;
border:1px solid red;
}
</style>
</head>
<body>
<div id="box1">box1</div>
<div id="box2">box2</div>
2016-02-24
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