A really nice feature here is that if you view the demos in a browser that doesn't support this (i.e. all current stable browser releases without special flags

A really nice feature here is that if you view the demos in a browser that doesn't support this (i.e. all current stable browser releases without special flags enabled) because they're building directly on grid layouts, they still appear in a pretty reasonable fixed-row format: https://webkit.org/demos/grid3/ https://webkit.org/demos/grid3/. In each case it'd look much nicer with a proper masonry layout but it's still very usable otherwise (and of course you could feature detect to provide a better fallback if you're not happy with that anyway).