There's 10 lines. If they're applying for a web development role and say "I don't know" to all of them, it tells me enough about their skills and abilities to

There's 10 lines. If they're applying for a web development role and say "I don't know" to all of them, it tells me enough about their skills and abilities to end the interview right there. If they don't know half of the trivia but tell me "this looks like it probably controls browser feature X", and they're making a reasonable guess (regardless whether it is correct or not), that's a good sign. If they don't know something but confidently pretend they know and spurt bullshit - red flag. I don't want to have to second-guess everything they say, and have them deliver something that looks right while being completely wrong. If you don't know what that specific prefixed attribute does, I don't care. If you don't know what a vendor prefix is in CSS, you haven't written much CSS.