
1990 - 1995: H T M L Specification was introduced in 1991
1995 - 2000: H T M L 3 point was 2 introduced in 1997
2000 - 2005: X T M L 1 was introduced in 2000
2005 - 2010: None
2010 - 2015: H T M L 5 was introduced in 2009 and was used actively until 2014
2015 - 2020: H T M L 5 point 1 was introduced in 2016 and H T M L 5 point 2 was introduced in 2017
2020 - beyond: H T M L 5 point 3 being formulated but release date is unknown
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