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Head metadata (SEO 有用)

---
id: head-metadata
title: Head Metadata
---

<head>
  <html className="some-extra-html-class" />
  <body className="other-extra-body-class" />
  <title>Head Metadata customized title!</title>
  <meta charSet="utf-8" />
  <meta name="twitter:card" content="summary" />
  <link rel="canonical" href="https://docusaurus.io/docs/markdown-features/head-metadata" />
</head>

# Head Metadata

My text