Front end developers often work on code created by previous employees or operate as part of a team. This question gives you an idea of whether they can create websites or web applications that will be understandable by other employees. What to look for in an answer:

Experience with code organization and code commenting

First-hand knowledge of what happens when code isn't commented appropriately

A willingness to make things easier on the other development teams

Example: "I organize my stylesheets with sections for each site component. Each section has comments throughout the code so other developers can change it."