If you're a Ph D that's interviewing for a job that requires you to write HTML, or a company interviewing Ph D holders to write HTML, something is wrong.
That's why you have on-site for, I can ask my super-duper-master friend to make the homework for me ;-) It's not a proof of anything.
At unis I know nobody could outsource PhD in computer science as it takes serious commitment and scientific publications to get one...