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3-21
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>css选择器</title>
  <style>
.abc{
background: lightblue;
}
.abc>p{
color: rgb(112, 148, 77);
}
.abc p+a{
color: hotpink;
}
div:nth-of-type(3){
background: goldenrod;
}
#box2{
background: dodgerblue;
}
p:only-child{
color: white;
}
a:only-of-type{
color: rgb(216, 63, 63);
}
body{
font-size: 3rem;
}
</style>
</head>
<body>
<div class="abc">
<p>
我是abc第一段文字
<p>
我是abc中第一段文字的第一段文字
</p>
<a href="">我是abc中第一段文字中的a</a>
<a href="">我是abc中第一段文字中的第二个a</a>
</p>
<p>我是第二段文字</p>
<a href="">abcxia下的a</a>
</div>
<div id="box2">
<a href="">我是box2中的a</a>
<a href=""></a>
</div>
<div>
<p>这里什么都没有</p>
</div>
<p>
<a href="">xiaoming</a>
</p>
</body>
</html>

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