I think is the WEB itself... 1991 August 6. The first WWW page that ever existed (and is still online), by Tim Barbers-Lee http://info.cern.ch/hypertext/WWW/TheProject.html
Until then internet was just a network of sending files to each others, nothing special for publishing stuff.
Corresponding message from the author regarding decision from 1993, ten years after it was made: https://videos.cern.ch/record/615845/embed
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good one!
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