Almost caught up to the capabilities of Ted Nelsons Xanadu Hypertext System from the mid 20th century.
But then I opened the Wikipedia page on Project Xanadu, it's second paragraph is:
> Wired magazine published an article called "The Curse of Xanadu", calling Project Xanadu "the longest-running vaporware story in the history of the computer industry".[2] The first attempt at implementation began in 1960, but it was not until 1998 that an incomplete implementation was released. A version described as "a working deliverable", OpenXanadu, was made available in 2014.
So... I don't know what to make of it.