Great stuff from James Wragg and the gang at Madgex: a way of lazy-loading ads for responsive sites without messing with the ad code.
This is excellent! Scott, Wilto, and the gang at Filament Group have released the tools they use to help them craft performant responsive sites. Lots of excellent resources for conditional loading here.
Scott walks through the code and thinking behind the conditional loading pattern on The Boston Globe site. This is such a useful and valuable pattern!
Keep this one handy in case you have to use conditional comments to hide something from Internet Explorer.