https://drafts.csswg.org/css-text-3/#line-break-property

• breaks between inseparable characters such as ‥ U+2025, … U+2026 i.e.
characters with the Unicode Line Break property IN. (See LineBreak.txt
in [UNICODE].)

The quoted text above is slightly ambiguous. I took it to mean that this rule "applies to all characters with the Unicode Line Break property IN, such as ‥ U+2025, and … U+2026"

The other possible meaning, given the order in the spec, is that this rule applies to characters such as ‥ U+2025, … U+2026 and those two are characters with the Unicode Line Break property IN

I suggest (if i understood correctly) rewording to say:

• breaks between characters with the Unicode Line Break property IN, i.e. inseparable characters such as ‥ U+2025, and … U+2026. (See LineBreak.txt in [UNICODE].)