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HTML5的特性以标签的形式存在
![ThinkPHP5实战之[教学管理系统]](https://img.php.cn/upload/course/000/000/068/6253d87459486427.png)
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
header{
width: 100%;
height: 100%;
background-color: yellow;
}
main {
width: 80%;
height: 100%;
background-color: gray;
}
main>article {
width: 80%;
height: 100%;
background-color: gray;
}
footer{
width: 80%;
height: 100%;
}
</style>
</head>
<body>
<header>头部</header>
<nav>导航</nav>
<main>
<article>左边</article>
<aside>右边</aside>
</main>
<footer>底部</footer>
</body>
</html>点击 "运行实例" 按钮查看在线实例
PS:以上标签都是块级标签
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