2.2.22 [HTML5:2014] Section 4.8 Links

C0036: The processing semantics of hyperlinks are not modified for some link types

The specification states:

 4.8 Links
     ...
     A hyperlink can have one or more hyperlink annotations that modify the processing 
     semantics of that hyperlink.

All document modes (All versions)

The processing semantics of hyperlinks are not modified for the following rel link types: author, bookmark, help, license, nofollow, search and tag.