Groups comparison
Browser-based(HTML)[HTML4;HTML5] - 1998 to 2015
Played in a regular internet HTTP browser, via HTML, javascript and/or server-side processing. Usually requires account registration, but not always even that.
HTML5 - 2000 to 2016
HTML specification started back in 2004, aiming to be fully finished by 2014. Notably adds support for hardware accelerated graphics via WebGL (subset of OpenGL) though includes many other things as well.
Google Native Client (NaCl) - 2011 to 2014
Uses Google Native Client sandbox to run a game on a web browser via C-like compiled code instead of being limited by things like Javascript and HTML5.
Played in a regular internet HTTP browser, via HTML, javascript and/or server-side processing. Usually requires account registration, but not always even that.
HTML5 - 2000 to 2016
HTML specification started back in 2004, aiming to be fully finished by 2014. Notably adds support for hardware accelerated graphics via WebGL (subset of OpenGL) though includes many other things as well.
Google Native Client (NaCl) - 2011 to 2014
Uses Google Native Client sandbox to run a game on a web browser via C-like compiled code instead of being limited by things like Javascript and HTML5.
browser
html5
gnacl