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Re: [csswg-drafts] [css-fonts] Specifying changes to parameters for fallback fonts (#126)

From: Dominik Röttsches via GitHub <sysbot+gh@w3.org>
Date: Thu, 21 Jan 2021 14:25:30 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-764677512-1611239129-sysbot+gh@w3.org>
> Personally, I'm not keen on the more complex forms being suggested for properties like font-weight, letter-spacing, etc., with lists of specific per-family values to be applied. It feels to me like it would become quite cumbersome and hard to maintain.

I agree with that. 

Jonathan, I think @xiaochengh, @chrishtr and I were talking about a similar approach to what you were drafting when talking about the ascent-overrides, etc. - One thing we talked about were potential issues with how specific the from-to mapping is if only using a font family name:

In your example, would `base-family: Times;` refer to a web font, a system font, or both?

In some cases, common system font families like Times are sometimes not available on a system and then mapped to other fonts, like Tinos, or for Arial, mapped to Deja Vu Sans on Linux for example. So it's a bit tricky to uniquely identify the intended base. One idea I had was to use something like `base: local(<PostScript or full font name>)` in that case, but that would not work for web fonts. Alternatively, some kind of link-id could be used. (Also, only very raw ideas so far). 

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