Though this has little to do with the
WWW whose anniversary the thread should be about
I couldn't stifle the urge to draw your kind attention to another computer pioneer.
Don't forget
Konrad Zuse and his Z3.
Unfortunately, or rather luckily (as it didn't prolong WWII) the Nazis weren't able to fathom the potential of Zuse's works and machines,
and after the war he made a few ill-fated decisions that displaced him and his firm out of the computer business and unfortunately never owned him the due credit for his exceptional achievements in the development of the computer, especially in the Anglo-American world.
Sorry, for this little aside.
Back to Sir Tim Berners-Lee's achievements.
As far as I know it wasn't the Hypertext Mark-up Language (HTML) alone for the rendering of the originally intended exchange of plots of scientific data between scientists at CERN.
What in my view even counts more was the invention of the Hypertext Transfer Protocol (HTTP) the underpinning of the WWW and with it the programming of the first webserver.
HTTP was an ingenious invention. A totally open protocol consisting of pure ASCII that everyone could read and easily apply.
This has led to the exponential growth of the Internet (which beginning with the ARPA Net already dates back some 40 years) into the
world's mind as we know and use it today.