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Physicist Tim Bernes-Lee prototyped ENQUIRE, a system for researchers to use and share documents. This system would be later used to develop HTML.
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Tim Berners-Lee starts to actually come up with the code for his World Wide Web project and produces the first recorded HTML documents.
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Tim Berners-Lee publishes "HTML Tags" for people
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HTML 2.0 to 4.0 are released to combat the quick development and different standards among users. Browser support has become nearly universal.
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W3C releases XHTML 1.0. Their goal was to shift HTML towards XML.
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A group of organizations & individuals got together to continue work on HTML, their goal being to take the HTML 4.0 specification and to just continue to improve it. They named themselves the Web Hypertext Application Technology Working Group, AKA WHATWG.
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W3C adpots their web applications 1.0 and renamed them HTML 5.
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W3C drops the charter from XHTML 2.0. Began to stagnate, and so W3C decided to basically stop all work on moving HTML towards XML.
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Two specifications of HTML are being developed at the same time-- one by the W3C & one by the WHATWG. Occasional cooperations, but the specifications are considered seperate from one another due to their different goals.