<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>页面结构分析</title>
</head>
<body><header><h2>网页头部</h2></header><sectiokn><h2>网页主体</h2></sectiokn><footer><h2>网页脚部</h2></footer></body>
</html>
https://www.bilibili.com/video/BV1x4411V75C?p=10&spm_id_from=pageDriver
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![mysql [ERR] 1273 - Unknown collation: ‘utf8mb4_0900_ai_ci‘](http://pic.xiahunao.cn/mysql [ERR] 1273 - Unknown collation: ‘utf8mb4_0900_ai_ci‘)
