实操创建中文网页，用 vi 修改 title 和 body 内容，引入 DOM Tree（Document Object Model 文档对象模型）概念。 讲解 html→head/body→title 的树形嵌套结构，补上 DOCTYPE 声明消除浏览器红色波浪线报错。 vibe-coding 生成的华丽网页，底层都离不开这个最基本的 HTML 框架。
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