I'd say this is a very valid question, as with all interview questions, how it is answered matters more than what is answered (unless the interviewee makes a gr

I'd say this is a very valid question, as with all interview questions, how it is answered matters more than what is answered (unless the interviewee makes a gross error to the point that it's fairly obvious they should not be hired). Interview questions are first and foremost windows into a thought process, not pop quiz. Even for a front end job, this may hint at how much someone has a view of the global stack and/or general CS knowledge, or how they react stepping out of their comfort zone. Maybe then your question here is not so much about an eventual interviewee answer but more about how to set your own expectations.