On the one hand, I find this amazing that you can just write out these more complex grid layouts and end up just filling them all out side by side.

On the other hand, I'm skeptical about some parts of this feature like the layouts. You're using space-delimited strings matching a different property you set via a class, whose positions and juxtaposition determine the layout? Seems prone to typos and like you're recreating an ASCII version of the layout in your CSS files.

I find it hard to express how bizarre I find it that for years we've used all kinds of arcane hacks (now conveniently packaged up in bootstrap) to do grid layouts for fear of mis-using the table element, and only recently we're seeing this.

The examples and descriptions on the second page are super off. For example, the first example should be described as

"To create #two# fixed-height rows of 150px and three fixed-width columns of 150px, simply write:"

and the css for "To add a fourth column that is 70px wide, write:" should have 3 150px columns, not two.

Thanks for the head's up. This has been fixed :)