I used to use these questions to interview candidate but found it to be really off putting and not terribly helpful.

What’s more important than their answers to these questions is how they got there. Have they vertically centered an element so many times it seems second nature? Did they find it in an unsubstantiated StackOverflow post? Did they write a C program to lay it all out using spans?

The bigger computer science questions are what you need answers to and I’d love to see some front end questions which address these, not minute trivia that will likely change down the road.