Don't usually question down votes, but I am genuinely confused about this one.

To me, the whole point of responsive web design is exactly that - responding/adapting to the limitations of the user's screen / browser / set up. As far as I'm concerned, the lack of JavaScript should be considered the same.

Shameless plug: exactly why I'm using html+css for laying out the new design of costpad.com. Example (in early alpha stage... just try browser window resizing please): http://costpad.com/ci/item/view/75