Ah, sorry, I missed that.

Hmm, dunno. Interesting idea, but I suspect the uncertainty of actual value might cause me very mild difficulties occasionally. I’d want to play around with it in various fonts. Its failure mode is probably worse than using em, seen in a font with particularly tall ascenders or descenders. But then again, I have a vague feeling such fonts might commonly just extend beyond their box, in which case it’s not actually any worse.

In other news, I really want wide browser support for the lh unit.