The first comment on TC is pretty self explanatory: HTML5 provides the structure, and the API's for Javascript to easily do its work. It's not supposed to do t

The first comment on TC is pretty self explanatory: HTML5 provides the structure, and the API's for Javascript to easily do its work. It's not supposed to do the drawing, animation, whatever. Javascript is supposed to do that. CSS3 for the design. The problem is, that there is no collective name for HTML5, Javascript and CSS3, so people just call it HTML5, collectively. It's not 100% correct, and this is the first reason why you are confused. So, it's only a terminology issue.