On Sun, 8 Nov 2020 at 11:24, Pablo Rodriguez <oinos@gmx.es> wrote:

> Hi Sylvain,
>
> this is the same as:
>
>   \definefontfamily[face1][rm][gabriola]
>
> Just in case, "slanted" is an already defined feature. It slants the font.
>
> >     \definefontfamily[face2][rm][gabriola][it={features:{default,
> > effect={}}}]
> >     \definefontfamily[face3][rm][gabriola][it={features:{default,
> > effect={width=1.0}}}]
>
> BTW, the documentation is clear
> (
> http://texdoc.net/texmf-dist/doc/context/presentations/bachotex/2018/bachotex-2018-fonteffects.pdf#search=fontfeature
> ):
> font features should be defined as such before being deployed.
>
> > Could someone explain:
>
> I will try from what I understand.
>
> > 1. What does "effect" mean?
>
> A ConTeXt (and not OpenType) font feature?
>
> > Why does "effect={}" embolden the fonts even though nothing ({}) is
> > given as arguments?
> "effect={}" may be reading default values (it might be intended behavior
> or not).
>
> But it also could be reading or calculating from previously defined values.
>
> > 2. Similarly, what does "width" do? Why does "width=1.0" shrink the
> > width of the line instead of doing nothing?
>
> This might be a bug, because of all the code improvements.
>
> I’m reporting a proper bug.
>

Thank you very much for the explanation and the bug report!

Just in case it helps: the line shrinking disappears with an additional
"delta=0":

    \definefontfamily[face3][rm][gabriola][it={features:{default,
effect={width=1.0, delta=0}}}]

Sylvain