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Vertical text handling in Unicode #140
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My response was: I wonder what real life use cases they base this on. Perhaps we should ask them. |
What Unicode says would be the primary solution for any case I can think of, as a native speaker. I guess the question would be why CSS recommends top-to-bottom, even when there's no bidi matters involved. |
My guess is that it has to do with it being significantly simpler to implement, especially in environments where the length of the line can be randomly altered by the user. The CSS approach means that the line-break point is always at the bottom of the line. It also makes it easier to handle combinations of Latin text embedded within Arabic, since they both share the same orientation and the directional layout is the same as for horizontal text (just on it's side). @behnam do you have examples of arabic text in vertical set lines of CJKM? (Note that i'm not referring to book spines, table headers, etc, since those would use writing-mode: sideways-lr/rl) |
Here is a video from this year’s ATypI about Sini style of Arabic calligraphy, and there was a remark about the direction of vertical Arabic: https://youtu.be/ZW_NACTXJ80?list=WL&t=1011 (the whole video is quite interesting). |
Thanks @Tosche for the interesting talk! Here's some discussion we've had about the direction of Arabic script in (completely) vertical setting. |
This is brought here from #102
@behnam wrote
Continuing the discussion on behavior in vertical lines...
From http://www.unicode.org/reports/tr9/#Vertical_Text
Therefore, Unicode recommends here that when there's only one text (strong chars only) direction, the Arabic should be written top-to-bottom, so glyph rotations should be 90º CCW. This contradicts the behavior recommended by latest CSS specs, and what we have in the document at the moment.
What do you think?
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