html规范整体结构
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8"/>
<title>HTML规范 整体结构</title>
<meta name="keywords" content=""/>
<meta name="description" content=""/>
<meta name="viewport" content="width=device-width"/>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7" lang="zh"> <![endif]-->
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<!--[if gt IE 8]> <html class="no-js" lang="zh"> <![endif]-->
</head>
<body>
</body>
</html>
- 必须将css文件引入并置于head中
- 必须将js文件引入并置于body底部
