abstract：<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0">&
<!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>Document</title>
</head>
<body>
<div style="border:1px solid red;width:1000px;height:20px;margin: 0 auto;background-color:#333">hellow word世界你好</div>
</body>
</html>
Correcting teacher：天蓬老师Correction time：2019-01-17 11:22:30
Teacher's summary：以后, 纯文本不要放在<div>应该放在有明确语义的标签中, 例如 <h2>,<p>等