This looks really nice. I can't wait to play with it on an upcoming project. Thanks to The Guardian for open sourcing it.

I'm curious what support on mobile is like. I tried the demo on my Nexus 7 and it worked well for the two minutes I played. However I skimmed the browserinconsistencies.md file and did not see any specific mention of mobile browsers. Mobile is a place where most of the existing solutions fall on their face. Having good mobile could really drive adoption.