Link canonical cascade

[simonpetry]

First off, love the lib. Would there be some merit to cascading a <link rel="canonical" ... /> tag? (link tags aren't cascaded and for good reason)

But this particular link tag has a uniqueness requirement akin to title and other meta tags,
Multiple canonicals are ignored (this is old, but looks to be still relevant)

Specify no more than one rel=canonical for a page. When more than one is specified, all rel=canonicals will be ignored.

To bring this to a question: right now canonical is required to be set on every page, but should this be handled as an edge case and cascaded, or maybe there something a little more interesting here where we can leverage the platform and give any link tag the ability to cascade given a unique identifier via an id or class (or other) attribute?

One last thing, the canonical tag in the readme is using a content attribute but I think you want an href attribute: <Link rel="canonical" content="http://jeremygayed.com/" /> to <Link rel="canonical" href="http://jeremygayed.com/" />

Thank you for you time

[tizmagik]

Interesting! What would a cascading a Link canonical look like? Would we just append them down the tree? 🤔

I guess we could support something like this by tweaking the cascade list here:

react-head/src/HeadProvider.js

Line 4 in 47393b4

const cascadingTags = ['title', 'meta'];

Although it would need to be slightly more sophisticated than that if we only want to cascade <Link rel="canonical" /> and not other Link tags. But I'm curious to understand your use case a bit better.