# Sorry, I slipped to consider about the # big picture attachment. I reduced the # image size and resend to Unicode mailing # list.
Kato-san, Thank you very much for prompt response. > This is a sample for line break of half-width katakana. (There is > good sample by web browser implementation) > http://mxr.mozilla.org/mozilla-central/source/layout/reftests/line-breaking/ja-3.html I wish if the sample text is longer to show the line breaking behaviour. I attached jugem.txt and the screenshot by Firefox and Chromium. > Firefox and IE11 define half-width katakana as ID. The line break of > half-width katakana is same as full-width katakana. > Chrome doesn't define it as ID. Half-width katakana isn't line break > per character. Oh, Google Chrome could not break half-width katakana text by per-character line breaking! It is very good example showing that the lack of explicit definition caused the incompatibility (and inconvenience). I'm sorry for troubling you about the explanation. I agree with your proposal to add halfwidth katakana to ID-class, even if further discussion is needed for other scripts. Regards, mpsuzuki Makoto Kato wrote: > Hi, Suzuki-san. Thank you for reply. > >> At present, I have no objection to add halfwidth katakana >> to ideographic-class in UAX#14, but I'm unfamiliar with the >> (negative) impact caused by the lack of halfwidth katakana >> in it. Could you tell me if you know anything? > > Since half-width katakana isn't ID, it isn't break line like > full-wdith katakana. > > This is a sample for line break of half-width katakana. (There is > good sample by web browser implementation) > http://mxr.mozilla.org/mozilla-central/source/layout/reftests/line-breaking/ja-3.html > > Firefox and IE11 define half-width katakana as ID. The line break of > half-width katakana is same as full-width katakana. > Chrome doesn't define it as ID. Half-width katakana isn't line break > per character. > > Although I read JIS X 4051, it doesn't define that half-width katakana > and full-width katakana are differently. > > >> I guess, the inclusion or exclusion in other classes, like, >> AI, AL, CJ, JL, JV, JT, SA might be quite important to realize >> the appropriate line breaking, but the inclusion or exclusion >> in ID-class does not seem to be important. If the inclusion >> in ID-class is important, more characters (e.g. Bopomofo) >> should be considered for full coverage. How do you think of? > > My discussion is why half-width katanaka character isn't same class of > full-width katakana character. In this case, half-width katakana > originally defines as AL at current spec. So when moving to ID, break > rule is strongly changed. (non-break -> break before or after). > > > -- Makoto > > On Tue, Apr 28, 2015 at 12:14 PM, suzuki toshiya > <mpsuz...@hiroshima-u.ac.jp> wrote: >> Kato-san, >> >> At present, I have no objection to add halfwidth katakana >> to ideographic-class in UAX#14, but I'm unfamiliar with the >> (negative) impact caused by the lack of halfwidth katakana >> in it. Could you tell me if you know anything? >> >> I guess, the inclusion or exclusion in other classes, like, >> AI, AL, CJ, JL, JV, JT, SA might be quite important to realize >> the appropriate line breaking, but the inclusion or exclusion >> in ID-class does not seem to be important. If the inclusion >> in ID-class is important, more characters (e.g. Bopomofo) >> should be considered for full coverage. How do you think of? >> >> Regards, >> mpsuzuki >> >> Makoto Kato wrote: >>> Hi. >>> >>> http://www.unicode.org/reports/tr14/proposed.html#ID defines Ideographic >>> (ID). Although full-width katakana is included in ID, half-width >>> katakana (U+FF66 and U+FF71-U+FF9D) isn't. Why? >>> >>> Also, Conditional Japanese Starter (CJ, >>> http://www.unicode.org/reports/tr14/proposed.html#CJ) considers >>> half-width variants such as half-width katakana letter small a. >>> >>> >>> -- Makoto
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