Variable SmallCaps`Const`

SmallCaps: { All: "all"; None: "none"; Small: "small" } = ...

Specifies capitalization options for text within a text frame.

Type declaration

ReadonlyAll: "all"
Convert all text to uppercase.
ReadonlyNone: "none"
Normal capitalization.
ReadonlySmall: "small"
Capitalize every letter but reduce the the size of all but the first letter.

See
https://developer.mozilla.org/en-US/docs/Web/CSS/font-variant-caps