[zuralski]

It's not quite pure HTML. It relies heavily on CSS.

It'd be much cooler to see what you can REALLY do with pure HTML5. No CSS. No JS. No bells and whistles.

[bahadden]

There is also a fair bit of javascript in there. Disable it, and the side navigation doesn't work.

[badboy]

HTML is just a markup language. How it is displayed relies on other factors (and that is where CSS comes in)