[jasondemeuse]

> This mobile up approach means your responsiveness is dependent on Javascript, which smells funny to me.

How so? In my experience it's the complete opposite. You certainly don't need any JS to make a responsive site, besides responsive images if you need it.

The whole point of mobile first is to get low site load, low http requests, JS only when necessary, etc, as to not keep anyone from accessing your content.

I think you have a really distorted view of what mobile-first design is.