Re: [css21] Make font weight mapping rules normative

Tab Atkins Jr. wrote:

> On Tue, Mar 30, 2010 at 12:19 AM, John Daggett <jdaggett@mozilla.com>  wrote:
>> There may have been other things said here that weren't captured in
>> the IRC log but I'd like to point out that there are two basic issues
>> with font weights:
>>
>> (1) Given a specific value of font-weight, which face within a set
>>    of faces for a given family should be selected?
>>
>> (2) Given a set of font faces, how to assign them onto the CSS 100 .. 900 scale?
> 
> Yeah, it may not have been clear, but what is intended is that the
> fourth bullet in the 2.1 spec (detailing how to fill in holes in the
> 100-900 range) be made normative.  The previous bullets (talking
> about how to assign font weights to CSS weights) is to be left in
> its current state of implementation-defined-ness.

Right, but the suggested edits do not completely form a normative
explanation for (1), the precise rules for weights 400 and 500 are
ambiguous in the current wording.