Sylvain Hubert schrieb am 08.11.2020 um 13:02:

On Sun, 8 Nov 2020 at 11:24, Pablo Rodriguez mailto: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/bachote...): 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}}}]

Don't set the values within \definefontfamily: \definefontfeature [myfeature] [effect={width=1.0, delta=0}] \definefontfamily[face3][rm][gabriola][it={features:{default,myfeature}}] Wolfgang