Charles Goldfarb, Edward Mosher and Raymond Lorie started developing it and named it after their surnames - GML 
:h1.Does this look a bit familiar? :p.it not only has paragraphs :ol. :li.But also stuff you maybe wouldn't expect - lists - this is the first item of an ordered list :li.And this is second item :eol. :p.Though it can't track you yet through canvas fingerprinting
In 1980, the first working draft of SGML was introduced
Now this is even more familiar, because HTML was until the HTML5 application of SGML. Because it is subset, tot everything from is implemented in HTML TODO:review,confirm
In March 1889, Tim Berners-Lee, a British scientist at CERN, submitted a proposal of what would later become the web. His boss, Mike Sendall, seemed to like it somehow, wrote a “Vage but exciting” note on the doc, and let him to continue.
In 1990, Tim used one of Steve Jobs' early products, a NeXT computer, as a first web server; the web-server software he wrote (along with Ari Luotonen and Henrik Frystyk Nielsen) in C was called CERN httpd
Using the technology, they created the first website, which you can browse on the original address (restored in 2013).
CERN published a HTML Tags document
This is not really a spec, it just lists 18 HTML tags
IIIR Working Group (Tim Berners-Lee and Daniel Connolly) published a draft v1.1 of HTML (so perhaps we may call it HTML 1.1)
IIIR Working Group published a draft of HTML 1.2
On November 24, 1995, HTML 2.0 was published as RFC 1866
HTML 2.0 is the first real HTML standard, it was given the 2.0 version to distinguish it from the previous informal versions and drafts.
The 2.0 version itself still lacks many important HTML capabilities (file upload, tables, client-side image maps and internationalization), which were added as suplemental RFCs to the 2.0 version of the spec.
On January 14, 1997, HTML 3.2 was published as a W3C Recommendation.
In the golden era of Netscape Navigator, HTML found its way to masses and was used to run services such as AltaVista, Yahoo, or AmazonTODO:review,confirm
On December 18, 1997, HTML 4.0 was published as a W3C Recommendation.
On December 24, 1999, HTML 4.01 was published as a W3C Recommendation.
In May 2000, ISO HTML, based on HTML 4.01 Strict, was published as ISO/IEC 15445:2000
W3C published the First Public Draft of HTML5.
W3C published HTML5 as a W3C Recommendation.
Now HTML is an environment for running complex apps, rather a than a simple markup language it used to be. It includes huge pack of new features, like:
Developers started to leverage those features instead of plugins like Adobe Flash or less known Microsoft's Silverlight and it led to gradual abandontment of plugin support by the browser manufacturers
W3C published HTML 5.1 as a W3C Recommendation.
As the version number suggests, there are few minor improvements: context menus, <details> and <summary> elements, more input types like month, week and datetime-local, responsive images (without css), etc...
W3C published Working Draft of HTML 5.2.