Re: [css3-text] New Working Draft

From: Philippe Verdy (
Date: Wed Apr 20 2011 - 18:47:04 CDT

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    "7.2. Emergency Wrapping: the ‘word-wrap’ property
      An unbreakable "word" may be broken at an arbitrary point if there
    are no otherwise-acceptable break points in the line. Shaping
    characters are still shaped as if the word were not broken, and
    grapheme clusters must together stay as one unit.[...]"

    Here I also suggest that contextually shaped characters should not
    just keep their normal shaping, but the joining types should be taken
    into account, to avoid breaking between joined character pairs, with a
    higher precedence for disjoined characters.

    Joining types here are what is currently standardized for Arabic, but
    it could also apply to any script using a joined cursive style
    (including Latin, Greek, Cyrillic). A problem appears : not all
    scripts that can be rendered in a joined cursive style have joining
    types defined, and the actual source for specifying such joining may
    be found in fact within fonts, as substitution&positioning entries ;
    however many fonts still use the same feature only to adjust the
    kerning, without creating any junction or ligature, e.g. between "AV",
    and many optional ligatures are still breakable, reversing the effect
    of contextual shaping of its constituant characters. One good decision
    would be to list only the scripts that are naturally joining. Are
    there other scripts than Arabic to consider ?

    Also for Latin, at least, the shaping of characters in a joined
    cursive style is not preserved when wrord-wraps are occuring : the
    hyphen is effectively inserted and letters on each side are shaped by
    forcing them to their disjoined shaping. Consider for example the
    shape of letter "j" when it joins with the following letter (most
    often a vowel) or when it occurs at the begining (leading tip or not)
    or end (closed curl or not) of word slice. Consider the shape of "r"
    (its leading junction) after either "o" or after "a" or "t" or "l".

    So I think that the current sentence is wrong : the presence or not of
    the wrap affects the shaping and does not necessarily preserve it as
    if there was no wrap.


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