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Re: [csswg-drafts] [css-text] Should zero width space break Arabic shaping? (#3861)

From: Najib Tounsi via GitHub <sysbot+gh@w3.org>
Date: Tue, 23 Apr 2019 12:45:13 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-485787167-1556023511-sysbot+gh@w3.org>
https://unicode.org/reports/tr44/#Release_Stability (Date 2019-02-27)

says ยง2.3.1 "Updates to character properties [...] may be required [...] to change the assigned values for a property". 
[...]
"For example, U+200B ZERO WIDTH SPACE was originally classified as a space character (General_Category=Zs), but it was reclassified as a Format character (General_Category=Cf) to clearly distinguish it from space characters in its function as a format control for line breaking"

1) It follows that, as a Format character, ZWS can also serve "to indicate word boundaries" as raised by @r12a.

2) Is ZWS still a "risky" character for a stable implementation?

@frivoal, I didn't find ZWS as "Transparent" in the link "https://www.unicode.org/Public/UCD/latest/ucd/ArabicShaping.txt". Am I missing something?






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