Link types "external" and "prefetch" have no normative definitions

[unor]

https://www.w3.org/TR/2017/CR-html52-20170808/links.html#sec-link-types

In the "Link types" section, it says:

The following table summarizes the link types that are defined by this specification, by their coresponding keywords. This table is non-normative; the actual definitions for the link types are given in the next few sections.

But there don’t seem to be definitions for external and prefetch outside of the table.

[chaals]

These are pretty straightforward.

rel="prefetch" is covered by WIkipedia probably reasonably reliably :)

rel="external" is described in the microformats wiki, and doesn't require browser behaviour - it is informational...

[gibson042]

According to the IANA Link Relation Types registry, prefetch is defined by https://www.w3.org/TR/resource-hints/#prefetch . external is not registered.

[edent]

Should the document also be updated with dns-prefetch, preconnect, prerender which are listed in the resource hints document?

[brucelawson]

Adding the relevant info; adding Richard Gibson to acknowledgements.