Re: [csswg-drafts] [css-fonts-4] [varfonts] Specify variable font instances relative to an ”anchor point”

@astearns I don't understand what you mean by “custom property”. Can 
you tell me more about how that might work?

@litherum I imagine this as more of an exact relativity, like em-based
 lengths, than lighter/bolder keywords. Not many web designers I know 
use lighter/bolder, but _many_ people use relative length units.

Related, I had another idea today about snapping to the closest named 
instance along an axis, perhaps like so:

`font-variation-settings: 'wdth' +100 snap;`

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