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The term "vertical scripts" needs formal definition. #230
Take, for example, HALFWIDTH KATAKANA LETTER A (U+FF71).
On Thu, Dec 22, 2016 at 12:20 PM, dae-kim ***@***.***> wrote: See https://www.w3.org/TR/ttml2/#style-attribute-textOrientation Take, for example, HALFWIDTH KATAKANA LETTER A (U+FF71). Is this part of a vertical script or horizontal script?
Note to editor: add a normative reference to Unicode Technical Report #50 , then make use of vertical orientation properties (U, R, Tu, Tr) as needed to better define tts:textOrientation value semantics. That is, do not define orientation in terms of script category (vertical vs horizontal) membership; rather, define it in terms of 'vo' property values in the context of a vertical WM.  http://unicode.org/reports/tr50/ Regarding U+FF71, its 'vo' property is specified to be 'R' in , i.e., "rotated 90 degrees clockwise"  http://www.unicode.org/Public/vertical/revision-17/VerticalOrientation-17.txt…
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