Re: [csswg-drafts] [css-text] Allow letter-spacing to have unitless values like line-height

Note: unitless values *are* a new unit - they're just a lazier way of adding a new unit without actually minting a new suffix. I'm trying to avoid adding new ones in new designs, when possible - when plain numbers are actually lengths in disguise, it makes calc() dramatically more complicated.  (See the third note in <https://drafts.csswg.org/css-values/#calc-syntax> where we talk about how it's not actually allowed - you can't add together `line-height: 1` and `line-height: 20px` into a `line-height: calc(1 + 20px)` - we'd need to mint an actual unit for that to work.)

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