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In early 2000ths it was fashionable to have decentralized extensibility that required zero coordination, e.g. Java and XML/XHTML had DNS-based namespaces. Microsoft had a UUID for every atom in the solar system.
And then HTML5 said "there are no namespaces, if you invent a new name, add it to the Wiki". Just like that! And it kinda worked. People do cooperate.