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Re: [css3-fonts] opentype font feature support

From: John Daggett <jdaggett@mozilla.com>
Date: Wed, 10 Mar 2010 03:30:09 -0800 (PST)
To: Jonathan Kew <jonathan@jfkew.plus.com>
Cc: www-style list <www-style@w3.org>
Message-ID: <209526918.35604.1268220609639.JavaMail.root@cm-mail03.mozilla.org>

Jonathan Kew wrote:

> However, I agree that "normal" really ought to mean using the
> kerning data in the font. (And could be renamed "kern" if people
> want it to be more explicit.) Then "none" or "no-kerning" is
> obviously used to turn it off.
> I'm not at all sure I'm in favor of a setting that means "user agent
> to decide".... it seems to me that if a UA is capable of kerning at
> all, then it should be doing it by default as a standard part of
> text rendering (just like it should be doing other standard features
> such as ccmp, locl, etc.) 
> So, I think the essentials would be
>     font-kerning: none | normal
> or
>     font-kerning: no-kern | kern

Thinking about this a little more now, I think 'none | normal' makes a
lot of sense, assuming 'normal' implies "apply metric kerning if data
available in the font".  If a user agent is supporting things like
variant glyphs then it's already doing enough processing that
performing metric kerning is unlikely to have a significant impact on

I think optical kerning should be left out for now, if it's really
desirable a separate value can be added later.

Received on Wednesday, 10 March 2010 11:30:43 UTC

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