Http://www.w3schools.com/

What is the deal with these guys and their certifications.
http://www.w3schools.com/cert/default.asp

Are they reputable? Or at least recognised. Basically clients ask do you know xml, html and css. Its ok to say yes and open some projects to show how you used these languages and what they can do. etc.

But would w3school’s certificate be a good choice if I wanted to get a piece of paper that stated the fact.

You know to have a third party vouche for me?
Cheers:to: