rel
rel=next / prev
Especially the next attribute might be helpful for a user agent to preload a page to minimize the waiting time between two pages:
<link rel="prev" href="page_3.html">
<link rel="next" href="page_5.html">
rel=canonical
Create a canonical link. This is useful if a site serves pages with almost the same or similar content. The page linked to is the canonical page, i. e. the page that the
search engine should be indexing.
<link rel="canonical" href="main.html?content=all">
rel=manifest
The target is a
Web app manifest which is a
JSON file that provides developers with a centralized place to put metadata associated with a web application, such as
- The web application's name
- Links to icons
- The preferred URL to open when a user launches the web application
- etc.
Also seen
<link rel="shortcut icon" href="files/cto_layout/img/favicon.ico" type="image/x-icon">
<link rel="apple-touch-icon" href="files/cto_layout/img/apple-touch-icon.png">
<link rel="search" type="application/opensearchdescription+xml" href="https://…/abc.xml" title="…">
<link rel="preload" href="./xyz.css" as="style">
<link rel="alternate" type="application/rss+xml" title="…" href="https://…/xyz.rss" class="…">