abstract：<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> </head><body>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div class="box">
<p style="background:red">hello world</p>
<span>123你好啊</span>
</div>
</body>
</html>