When a feature like developer.mozilla.org/en-US/… is implemented across multiple engines, I expect the spec for it to be in somewhat decent shape.

I don't expect to find multiple fundamental missing pieces just skimming the spec. First 3 implementors should have reported those.

But it's css-multicol, so I just filed github.com/w3c/csswg-drafts/… #1072 is worst, #1071 is also bad, & somebody should have noticed the rest.

I do recall suggesting that maybe column-span should be punted to level 2 of this spec. Now I regret not pushing harder on that.