Alan Braslau schrieb am 23.01.19 um 17:49:
On Wed, 23 Jan 2019 17:32:41 +0100 Henning Hraban Ramm
wrote: What are the roles of "*default" and "sa 3" as these appear to be unnecessary? *default activates the default set of OpenType features. Are not the default set of OpenType features activated by default? (as the name might suggest...). Perhaps *no* features are selected, by default... (a misnomer, therefore).
default is just one of many predefined feature sets: \definefontfeature [default] [always] [liga=yes, tlig=yes, trep=yes]
sa 3 is the font size factor. Of course, but how is it used? In my example, I scale the text to a specific width, so I really don't care what font size is selected and would assume that the design optimal or "natural" size would be selected, by default. In your case it isn’t needed but when you have a heading which should always be twice the size of the bodyfont you can add "sa 2" to do this.
Wolfgang