Pure CSS runs in the browser without a get request (other than the CSS file you are already using, obv.) so it eliminates the need for a grid system like Bootstrap, 960gs etc. The 'grid' is there in the CSS and html where it is meant to be, without the need for @media queries with 10 decimal points and 15 font sizes. It also provides more layout options than currently exist without the need for hacky solutions.
How useful the linked site is right now is questionable though. If you want a IE8+ cross browser & mobile site to rely on flex-box ... it can be done and quite easily, but not with the skeleton examples on that page (but they do point that out themselves).
I'd like to read more about flexbox, any link you'd recommend? Especially backwards compatibility and the cross browser/mobile you are mentioning are something I'm interested in. Thanks
This is the kind of response I was looking for. Though I have to ask, is this specific to Cassowary.js or to Cassowary constraint solver in general?
Because from what I've seen/heard, the Cassowary constraint solver is used extensively in Mac OS X/iOS for UI layout, which AFAIK isn't really referred to as slow.
Plus the constraint solver does operate on a matrix of constraint, which should make it easier to work on GPU.
Autolayout is very slow compared to manual layout on iOS. It limits the complexity of the UI you can build, especially if you need to update the layout at the display's refresh rate.
[0]http://en.wikipedia.org/wiki/Cassowary_(software)
[1]http://gridstylesheets.org/