The answers to a lot of google-juice questions seem to involve the use of rel= in a tags (eg rel="canonical"). Is there an exhaustive list somewhere of all of the possible options for this tag and what they mean? I found this from W3 schools, but it doesn't have canonical on it and I'm wondering what else it's missing.
The official link types as defined by the W3C specify the following for HTML 4.01:
In HTML 5 the W3C appear to have handed off registration and management of these link types to the microformats folks. See section 18.104.22.168` Other link types:
There is also a
If you scroll down you can see the stable, draft, provisional etc
IANA also define a list of link relations which can be found here:
This links to RFC5988:
As far as SEO goes there are not a lot of values officially recognized for the
There are other values you can add the
FYI, you should also check out schema.org for microformats. This is another way to add structure to your markup to help search engines recognize your data as being of a certain type and index accordingly.