[csswg-drafts] [css-fonts-4] [varfont] Relative weight / width adjustments

behdad has just created a new issue for 
https://github.com/w3c/csswg-drafts:

== [css-fonts-4] [varfont] Relative weight / width adjustments ==
Petr van Blokland asked me to relay this.  It would be very handy if 
one can say things like:
```
font-weight: +50; 
font-width: -10;
```
I don't know if that's possible using current CSS technology (calc?), 
but I agree it's very interesting.  That's basically an extension of 
"bolder" / "lighter".

Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/543 using your GitHub 
account