Generally the candidates that don't pass that first question don't have sufficient experience with JavaScript. Sometimes this is because they have more experien

Generally the candidates that don't pass that first question don't have sufficient experience with JavaScript. Sometimes this is because they have more experience on the backend and for whatever reason said they knew JavaScript on their resume and found themselves in the frontend portion of a fullstack interview. Other times the candidate has a lot of experience with CSS and layouts, but doesn't have much experience with JavaScript beyond jQuery. Out of five candidates, two might fail this... but it comes down to the candidates in the pipeline. Working closely with your recruiters can take that number down to zero. I've found that filters like this become more necessary when there are a lot of positions to fill.