The first website was created by Tim Berners-Lee in 1991.
Why it is true
The first website, info.cern.ch, was created by Tim Berners-Lee at CERN in 1991. It explained what the World Wide Web was and how to use a browser. It is still online, preserved by CERN.
Source: CERN
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.