Front end developers need a strong grasp of usability and accessibility when they're designing experiences for end-users. This question gives you insight into their knowledge of these standards and best practices. What to look for in an answer:

First-hand experience implementing usability and accessibility standards

A drive to create a web experience that's accessible to all end users

Ways that the applicant has implemented usability and accessibility in their previous projects

Example: "I test my web applications on various browsers and devices to check whether the experience is usable on all devices. I also use popular screen reading software and other assistive solutions to see whether it's accessible for all potential users."