The following changes have been made to html.md in the versions listed;

2016.09.02, Version 3.1.0

2013.10.09, Version 3.0.2

2013.08.16, Version 3.0.1

2013.08.15, Version 3.0.0

2013.05.06, Version 2.1.1

2013.05.03, Version 2.1.0

2013.02.04, Version 2.0.2

2012.12.12, Version 2.0.1

2012.12.11, Version 2.0.0