Per-Character CSS3 Line Break Semantics

The following table enumerates the line breaking semantics of specific characters explicitly enumerated by ​CSS3 Text.

The columns of the table are defined as follows:

• Code - Unicode code point (in hexadecimal), except - which means all other characters not explicitly listed
• UAX14 - Line breaking class assigned by UAX14
• ICU() - Behavior implemented by ICU when primary language subtag of locale is not specified or not 'ja' or 'zh' (or equivalent)
• ICU(ja) - Behavior implemented by ICU when primary language subtag of locale is 'ja' or 'zh' (or equivalent)
• Loose() - Behavior prescribed by CSS3 when line-break is loose and content language is not Japanese or Chinese
• Loose(ja) - Behavior prescribed by CSS3 when line-break is loose and content language is not Japanese or Chinese
• Normal() - Behavior prescribed by CSS3 when line-break is normal and content language is not Japanese or Chinese
• Normal(ja) - Behavior prescribed by CSS3 when line-break is normal and content language is not Japanese or Chinese
• Strict() - Behavior prescribed by CSS3 when line-break is strict and content language is not Japanese or Chinese
• Strict(ja) - Behavior prescribed by CSS3 when line-break is strict and content language is not Japanese or Chinese
• Character Name - Unicode character name

The values of the UAX14 column designate (a subset of the) line breaking classes defined by UAX14 as follows:

• BA - Break After
• CJ - Conditional Japanese Starter
• EX - Exclamation/Interrogation
• IN - Inseparable
• NS - Nonstarters
• PO - Postfix Numeric
• PR - Prefix Numeric

The values of the ICU() through Strict(ja) columns designate the following breaking behavior:

• B/A - break permitted before or after
• XA - break excluded after
• XB - break excluded before
• XP - break excluded between any pair in class
• - - break behavior defined by default line breaking behavior

Code	UAX14	ICU()	ICU(ja)	Loose()	Loose(ja)	Normal()	Normal(ja)	Strict()	Strict(ja)	Character Name
0021	EX	XB	XB	-	B/A	-	XB	-	XB	exclamation mark
0024	PR	XA	XA	-	B/A	-	XA	-	XA	dollar sign
0025	PO	XB	XB	-	B/A	-	XB	-	XB	percent sign
003A	IS	XB	XB	-	B/A	-	XB	-	XB	colon
003B	IS	XB	XB	-	B/A	-	XB	-	XB	semicolon
003F	EX	XB	XB	-	B/A	-	XB	-	XB	question mark
00A2	PO	XB	XB	-	B/A	-	XB	-	XB	cent sign
00A3	PR	XA	XA	-	B/A	-	XA	-	XA	pound sign
00A5	PR	XA	XA	-	B/A	-	XA	-	XA	yen sign
00B0	PO	XB	XB	-	B/A	-	XB	-	XB	degree sign
2010	BA	B/A	B/A	-	B/A	-	B/A	-	XB	hyphen
2013	BA	B/A	B/A	-	B/A	-	B/A	-	XB	en dash
2025	IN	XP	XP	B/A	B/A	XP	XP	XP	XP	two dot leader
2026	IN	XP	XP	B/A	B/A	XP	XP	XP	XP	ellipsis
2030	PO	XB	XB	-	B/A	-	XB	-	XB	per mille sign
2032	PO	XB	XB	-	B/A	-	XB	-	XB	prime
2033	PO	XB	XB	-	B/A	-	XB	-	XB	double prime
203C	NS	XB	XB	-	B/A	-	XB	-	XB	double exclamation mark
2047	NS	XB	XB	-	B/A	-	XB	-	XB	double question mark
2048	NS	XB	XB	-	B/A	-	XB	-	XB	question exclamation mark
2049	NS	XB	XB	-	B/A	-	XB	-	XB	exclamation question mark
20AC	PR	XA	XA	-	B/A	-	XA	-	XA	euro sign
2103	PO	XB	XB	-	B/A	-	XB	-	XB	degree celsius
2116	PR	XA	XA	-	B/A	-	XA	-	XA	numero sign
3005	NS	XB	XB	B/A	B/A	XB	XB	XB	XB	ideographic iteration mark
301C	NS	XB	XB	-	B/A	-	B/A	-	XB	wave dash
303B	NS	XB	XB	B/A	B/A	XB	XB	XB	XB	vertical ideographic iteration mark
30A0	NS	XB	XB	-	B/A	-	B/A	-	XB	katakana-hiragana double hyphen
3041	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small a
3043	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small i
3045	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small u
3047	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small e
3049	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small o
3063	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small tu
3083	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small ya
3085	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small yu
3087	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small yo
308E	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small wa
3095	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small ka
3096	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	hiragana letter small ke
309D	NS	XB	XB	B/A	B/A	XB	XB	XB	XB	hiragana iteration mark
309E	NS	XB	XB	B/A	B/A	XB	XB	XB	XB	hiragana voiced iteration mark
30A1	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small a
30A3	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small i
30A5	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small u
30A7	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small e
30A9	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small o
30C3	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small tu
30E3	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ya
30E5	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small yu
30E7	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small yo
30EE	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small wa
30F5	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ka
30F6	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ke
30FB	NS	XB	XB	-	B/A	-	XB	-	XB	katakana middle dot
30FC	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana-hiragana prolonged sound mark
30FD	NS	XB	XB	B/A	B/A	XB	XB	XB	XB	katakana iteration mark
30FE	NS	XB	XB	B/A	B/A	XB	XB	XB	XB	katakana voiced iteration mark
31F0	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ku
31F1	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small si
31F2	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small su
31F3	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small to
31F4	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small nu
31F5	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ha
31F6	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small hi
31F7	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small hu
31F8	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small he
31F9	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ho
31FA	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small mu
31FB	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ra
31FC	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ri
31FD	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ru
31FE	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small re
31FF	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	katakana letter small ro
FF01	EX	XB	XB	-	B/A	-	XB	-	XB	fullwidth exclamation mark
FF04	PR	XA	XA	-	B/A	-	XA	-	XA	fullwidth dollar sign
FF05	PO	XB	XB	-	B/A	-	XB	-	XB	fullwidth percent sign
FF1A	NS	XB	XB	-	B/A	-	XB	-	XB	fullwidth colon
FF1B	NS	XB	XB	-	B/A	-	XB	-	XB	fullwidth semicolon
FF1F	EX	XB	XB	-	B/A	-	XB	-	XB	fullwidth question mark
FF65	NS	XB	XB	-	B/A	-	XB	-	XB	halfwidth katakana middle dot
FF67	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small a
FF68	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small i
FF69	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small u
FF6A	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small e
FF6B	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small o
FF6C	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small ya
FF6D	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small yu
FF6E	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small yo
FF6F	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana letter small tu
FF70	CJ	XB	B/A	B/A	B/A	B/A	B/A	XB	XB	halfwidth katakana-hiragana prolonged sound mark
FFE0	PO	XB	XB	-	B/A	-	XB	-	XB	fullwidth cent sign
FFE1	PR	XA	XA	-	B/A	-	XA	-	XA	fullwidth pound sign
FFE5	PR	XA	XA	-	B/A	-	XA	-	XA	fullwidth yen sign
-	-	-	-	-	-	-	-	-	-	all other characters

Implementation Details

• If line-break is auto, content language is neither Japanese nor Chinese, and ICU does not provide a tailored set of rules that applies to the content language, then use the ICU() column's behavior;
• If line-break is auto, content language is neither Japanese nor Chinese, and ICU does provide a tailored set of rules that applies to the content language, then use the ICU() column's behavior modulo application of tailored rules;
• If line-break is auto and content language is Japanese or Chinese, then use the Normal(ja) column's behavior;
• If line-break is loose and content language is neither Japanese nor Chinese, then use the Loose() column's behavior;
• If line-break is loose and content language is Japanese or Chinese, then use the Loose(ja) column's behavior;
• If line-break is normal and content language is neither Japanese nor Chinese, then use the Normal() column's behavior;
• If line-break is normal and content language is Japanese or Chinese, then use the Normal(ja) column's behavior;
• If line-break is strict and content language is neither Japanese nor Chinese, then use the Strict() column's behavior;
• If line-break is strict and content language is Japanese or Chinese, then use the Strict(ja) column's behavior;