The passage is:
On August 6, 1991, Tim Berners-Lee published the first Web site working in a Swiss physics laboratory.
How to explain
The personification is the phrase "published the first Web site."
Typically, "publish" is used to describe the action of a person making something public, such as a book, article, or piece of art. However, in this passage, the website itself is being personified as the "subject" of the action. This gives the website a sense of agency and importance, suggesting that it is not simply a passive object but an active force in the world.