Re: [css3-fonts] "font-feature-settings: none" shorthand?

On Thu, May 30, 2013 at 5:36 PM, John Daggett <jdaggett@mozilla.com> wrote:

>
> Glenn Adams wrote:
>
> > I guess I should add that I plan to support a generic 'none' value
> > no matter whether [css-fonts] adds it to the spec.
>
> Glenn, you seem to *really* want to add this value.  Could you explain
> a little more why you think this is important?
>
> The only difference between a 'none' value and the existing 'normal'
> value of the 'font-feature-settings' is that default features are
> enabled.  As listed in section 7.1 [1], features enabled by default
> are some ligature, contextual form features, localized features and
> features related to marks. Given that 'font-variant-ligatures' already
> has a 'none' value to disable the default ligature and contextual form
> features, that leaves only required ligatures, localized forms and
> mark features. What possible use case is there for explicitly
> disabling these off all together?
>
> The use case you mentioned, of an Apache FOP user wanting to
> experiment with "all features off" [2] really seems more appropriate to
> 'font-variant-ligatures: none; font-feature-settings: normal'. I doubt
> they were even thinking about features required for proper rendering
> of marks or Arabic.
>
> It seems to me the chance of an author accidentally using this as a
> type weapon of mass destruction is *far* higher than an author
> actually using this for a purpose that can't be achieved more
> intelligently either by disabling specific features or by using the
> 'none' value of 'font-variant-ligatures'.
>

I firmly believe authors should be able to control behavior, including
shooting themselves in the head if they wish.


>
> Regards,
>
> John Daggett
>
> [1] http://dev.w3.org/csswg/css-fonts/#default-features
> [2] http://lists.w3.org/Archives/Public/www-style/2013May/0774.html
>
>