fn suppresses_line_break_for_keep_all(character: char) -> boolExpand description
From https://drafts.csswg.org/css-text-4/#valdef-word-break-keep-all:
Breaking is forbidden within “words”: implicit soft wrap opportunities between typographic letter units (or other typographic character units belonging to the NU, AL, AI, or ID Unicode line breaking classes [UAX14]) are suppressed, i.e. breaks are prohibited between pairs of such characters (regardless of line-break settings other than anywhere) except where opportunities exist due to § 6.1.1.1 Lexical Word Breaking. Otherwise this option is equivalent to normal. In this style, sequences of CJK characters do not break.
From https://drafts.csswg.org/css-text-4/#typographic-letter-unit:
A typographic letter unit (or letter for the purpose of this specification) is a typographic character unit belonging to one of the Letter or Number general categories. See Appendix E: Characters and Properties for how to determine the Unicode properties of a typographic character unit.