I've been doing web development since the web began, literally. The percentage of my time that I've cared about the stuff in this header is approximately .00004

I've been doing web development since the web began, literally. The percentage of my time that I've cared about the stuff in this header is approximately .000047%. And when I do care, I can look it up and reacquaint myself. A full stack developer has so many things to know. This is representative of the kinds of questions that make interviewing so awful these days. Oh, and I've interviewed hundreds of front end developers, so I've been on both sides of the table.