現在網頁有桌機板、手機版還有 AMP 版，這些版本要設定 Canonical (for SEO)的話，應該要怎麼設定呢？
Canonical 在桌機、手機、AMP 要怎麼設定
以下是桌機為主，手機版為輔的情況，未來若 Google 推行 Mobile First 後(註：Google delays mobile-first indexing deadline to March 2021)，直接叫大家都把桌機、手機使用 RWD 整合起來，若還要分三種版本，就在看看有沒有更新的建議作法了~
這邊先講簡單的結論：
- 桌機：
- 到 AMP
- 到 Mobile
- 手機：
- 到 AMP
- AMP：
- AMP Indexing FAQs - Search Console Help
If for some reason, all three of desktop, mobile, and AMP exist:
- Desktop: point to AMP with and to mobile with rel=alternate
- Mobile: point to desktop with
下述摘錄自此篇：AMP project issue: how to put canonical for website and mobile site，這篇有直接完整的範例：
- https://www.example.com/desktop/page.html (this is the desktop version of the page) has:
- https://m.example.com/mobile/page.html (this is the smartphone version of the page) has:
- https://a.example.com/amp/page.html (this is the AMP version of the page) has:
相關網頁
- Prepare your page for discovery and distribution - amp.dev
-
Separate URLs | Google Developers
- 行動版網址必備的 rel="canonical" 標記仍應加到行動版網頁的 HTML 中
- AMP Indexing FAQs - Search Console Help
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