<!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
