这题搞不懂明白,求助!
meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>分组选择符</title>
<style type="text/css">
h1,span{color:red;}
.first{
color:green;}
#second span{
color:green};
}
</style>
</head>
<body>
<h1>勇气</h1>
meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>分组选择符</title>
<style type="text/css">
h1,span{color:red;}
.first{
color:green;}
#second span{
color:green};
}
</style>
</head>
<body>
<h1>勇气</h1>
2016-06-10
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