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<!DOCTYPE html>
<html lang="en">
<head>
<title>新网页</title>
</head>
<style>
.main div{color:red;}
.d1{color:blue;}
</style>
<body>
<div class="main">
<div class="d1">123</div>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<title>新网页</title>
</head>
<style>
.main div{color:red;}
</style>
<body>
<div class="main">
<div style="color:blue;">123</div>
</div>
</body>
</html>