The infamous `<rel>` property

<link rel="canonical href=“[url]”>`

• Not a concrete directive, just a way to offer a preference about which URL should be preferred

Attributes

nofollow

Tell Web Scrapers not to index the URL specified specified in the link

noopener

Navigate to the target resource without granting access to the document that opened it.

Cases

• noopener not specified - Window.openerbrowser property passed to the new Web Page (hypertext document)
• rel=noopener specified - Window.openernot passed to the new Web Page and new browsing context cannot access any information about the previous page in JavaScript