I've been using text-overflow recently and I discovered the hard way that
it doesn't work for text that overflows vertically (out the bottom of an
element). This limitation isn't documented on MDN, so it was a frustrating
experience of trial and error. I think that text-overflow should be
improved to support vertical overflows as well, since this is the the most
common use case (eg: multi-line summary descriptions). At the very least
the MDN documentation should be updated with this limitation.