Flexible Grid System
One Pager promoting and demonstrating a new CSS ‘Flexible Grid System’ including a useful responsive device tester further down.
This website has unfortunately been redesigned or gone offline, so I have removed the direct link to it. The screenshot below hopefully preserved enough of the design but if you are really keen to inspect further, try this Archive.org link. FYI: the site was first featured on 06 August 2014.