> So, is it uncommon, or bad practice, to use both in this situation?
> {height: 7.2em; width: 20%;}
> To give you a menu with six lines (no matter what size type) but still only
> occupying 20% of the parent container so it scales with window size.
Personally, that's my default way of laying out a page: vertical dimensions in
ems and horizontal dimensions in percents. It often (IMO) makes sense to size
vertically with ems (since you've mostly got text and want sizes in relation to
it) and horizontally in percents (so your page doesn't have to scroll
horizontally). As for best practice, I've never heard anything either way, but
it certainly makes sense.
---Tim
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