UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36

Steps to reproduce the problem:
1. Tab to a "Back to Top" link (that points to # or #top, not an actual specified id)
2. Click enter
3. Tab again
4. Note that the tabbing continues from the "Back to Top" link.

An example can be seen here: https://www.bbc.co.uk/schedules/p00fzl86

What is the expected behavior?
Tabbing should continue from the top of the page.
In the case of https://www.bbc.co.uk/schedules/p00fzl86 tabbing should move to "Skip to Content" rather than the next radio show.

What went wrong?
The tabbing continued on from the "Back to Top" link.

Did this work before? N/A 

Chrome version: 65.0.3325.162  Channel: n/a
OS Version: OS X 10.13.1
Flash Version: 

I have also tested this with a bare-bones HTML file using both # and #top. Neither produces the desired result.