[ausjke]

what does 'serving up mobile layout' exactly mean? Thanks.

yes grid is awesome but how to deal with polyfill is the question

[kinos]

I assume design something akin to just all your elements in a straight line downwards.

[poxrud]

I think it means make your containers 100% width blocks and stack them on top of each other vertically.

I will be taking the approach of creating a "good enough" layout for older browsers and a superior layout to modern browsers using "@supports" feature query.