[css-fonts-4] Clarify basic syntax of descriptors font-stretch, font-style, font-weight #8085
Description
I think that there are some issues with the value definitions of font-stretch, font-style, font-weight.
font-stretch is defined with auto | <'font-stretch'>{1,2} and <'font-stretch'> expands to normal | <percentage [0,∞]> | ultra-condensed | extra-condensed | condensed | semi-condensed | semi-expanded | expanded | extra-expanded | ultra-expanded.
Does that mean that condensed expanded is valid? EDIT: I guess that there is no reason to parse it as invalid, but Example 29 with font-weight could illustrate this.
font-style is defined with auto | normal | italic | oblique [ <angle>{1,2} ]? and there is a specific rule written in prose for the range allowed for <angle>.
I think it can be defined with auto | normal | italic | oblique [ <angle [−90deg,90deg]>{1,2} ]?.
font-weight is defined with auto | <font-weight-absolute>{1,2} and there is a specific rule written in prose excluding bolder and lighter in <font-weight-absolute>, which expands to [normal | bold | <number [1,1000]>].
The specific rule does not seem required anymore. And does that mean that 200 bold is valid? EDIT: I guess that there is no reason to parse it as invalid, but Example 29 could illustrate this.