[csswg-drafts] [css-text] Line breaking should fallback to UAX14 in absence of other rules (#5068)

r12a has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-text] Line breaking should fallback to UAX14 in absence of other rules ==
Moving an old [thread on the www-style list](http://www.w3.org/Mail/flatten/index?subject=I18N-ISSUE-316&list=www-style) to GitHub to keep it visible. Please read that thread before replying here.

The spec defines behaviour for several UAX14 line-break classes, such as IN and PR in CJK text, and WJ, ZW, and GL in general text.  But there's no recommendation in the spec (other than a note which simply says that further information can be found for all scripts in UAX14) that says that **in the absence of other rules** in the spec or in an implementation, then the UAX14 line-break properties should be applied as a fallback. 

The i18n WG believes that recommending this (as a fallback only, like the UBA for sorting when no tailoring is available) will: 
1. promote interoperability for the cases not otherwise defined, and 
2. will also encourage implementers to fully implement UAX14 for the non-controversial cases that are currently outstanding (for example, 11047 BRAHMI DANDA should allow a line break after but doesn't in FF).

We encourage tailoring of the rules for particular contexts, and propose this only as a kind of 'safety net'.



Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5068 using your GitHub account

Received on Thursday, 14 May 2020 16:16:37 UTC