This is a really good article and the examples are very pretty. I especially enjoyed the part about how filter:drop-shadow contours to the shape of the element

This is a really good article and the examples are very pretty. I especially enjoyed the part about how filter:drop-shadow contours to the shape of the element (did not know that, and that's a handy trick). However just beware that there can be a decent performance hit from having a lot of box-shadows.