How and when should petite caps be used?

I am the lucky owner of James Felici’s magnum opus The Complete Manual of Typography (second edition). In most documents I write (academic), I prefer using EB Garamond, as it now is a fully-fledged font with support for most symbols, as well as excellent Greek. I recently discovered that in subset 1 of the font, there are petites. I cannot, however, find any instructions on neither when nor how petites should be used in Felici, and I do not have access to any other such books at my library.

There is a somewhat related post about this topic here, but it does not say anything about the usage of petites (only small caps).

  • Here is the font instruction I use in my regular text when enabling ss01 (in LibreOffice): EB Garamond:liga=1&calt=1&onum=1&pnum=1&ss01
  • Adobe’s list of OpenType features: ‘Syntax for OpenType features in CSS’

It seems strange that this alternative would exist without having a prescribed suggestion for how to use it. Is it, for instance, better suited to running text (e.g. on the first line after an initial?), whereas small caps should be used for shorter segments (acronyms, abbreviations and the likes)? I just don’t have any idea, but expect there to be a typographic consensus as to what is the better usage.

Answer

It seems like there is not much consensus in the typographic community either and that they have very niche uses.

Summarizing these conversations from Type Drawers and Typophile

Petite caps are meant to be smaller than Small caps and were introduced a while ago before stylistic sets, when OpenType fonts were not nearly as common. One designer states that he designs petite caps with a squarer aspect and that he ensures that petite caps have little impact on the line length.

Why designers have used them

  • Because they harmonise well with the lowercase, while still having
    regular small caps that are a bit taller
  • To maintain a nice even texture when used in a fairly large size informational text on walls or panels, as well as display uses
  • For a more harmonious inline, lead-in small caps at the beginning of a section
  • Having two sizes of caps is valuable in complex publications and when there is a need for integration with other scripts such as Cyrillic
  • In German body text, where words are frequently distinguished on the basis of upper vs. lower case, the use of petite caps seems to increase reading speed

Some other fonts featuring petite caps:

Because of their scarcity, petite caps are less likely to be supported by a multitude of software.

Attribution
Source : Link , Question Author : Canned Man , Answer Author : curious

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