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So I recently was working on a site and wanted to use CSS3 columns. But I really like how the grid system works in Bootstrap, and wanted to be able to define columns in a similar way (i.e. have different number of columns depending on the screen size). Not finding any pre-cooked versions, I decided to write my own.
Strictly speaking, you don’t need Bootstrap for this to work. But I did re-use Bootstrap’s grid variables so that it breaks along the same lines that Bootstrap’s grid does. It’s also worth noting that, natively, the columns will collapse on their own if you specify a width. This method just gives you a bit more control.
Now, you can do something like this:
And it will collapse appropriately. You can see it in action on this JSFiddle.
The original release weighed in at roughly 12k compressed. I trimmed some of the fat off it. The current version weighs in at 7.6kb minified, which is about as small as it can get until those properties have no prefixes. If you want, though, you could use the mixin and the media queries to only generate the selectors you actually need. That would trim the file down to a ridiculously small size.
You can download a zip file containing the source SCSS, standard CSS and minified CSS for the full 12-column layout supporting all bootstrap break points, below. No license. Consider it public domain.