1. HTML 元信息

元数据就是描述数据的数据

<meta charset="utf-8" />

<meta name="author" content="Chris Mills" />
<meta
  name="description"
  content="The MDN Web Docs Learning Area aims to provide
complete beginners to the Web with all they need to know to get
started with developing web sites and applications." />

参考 §

“头”里有什么——HTML 元信息 - 学习 Web 开发 | MDN