[css-fonts] Missing serialisation for 0 ranged descriptors inside @font-face

[tursunova]

In the spec there is no specification on whether 0 ranged font-stretch, font-style and font-weight descriptors inside @font-face rule should be simplified or not. E.g., if font-weight: 200 200; is specified inside @font-face then it's not clear on whether rule.style.getPropertyValue("font-weight") should return 200 or 200 200. Chrome and Safari are currently returning 200 200 while Firefox is returning just 200.

The issue was also discussed in the conversation in WPT PR #36489

[tursunova]

Since there is a general rule to serialize things in a simpler form in spec:

If component values can be omitted or replaced with a shorter representation without changing the meaning of the value, omit/replace them.

I'm proposing to simplify 0 ranged descriptors inside @font-face rule as well.

[svgeesus]

That makes sense to me.

[svgeesus]

@tursunova sorry for the delay; I added Agenda+ a while ago but we have a backlog, more items to discuss than we can cover in a week.

[tursunova]

@svgeesus no worries, thank you for adding Agenda+

[fantasai]

@svgeesus I think you can just accept this under Editor Discretion, since it's just a corollary of the serialization principles.