The term "vertical scripts" needs formal definition.

[dae-kim]

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?

[skynavga]

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 [1], 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. [1] http://unicode.org/reports/tr50/ Regarding U+FF71, its 'vo' property is specified to be 'R' in [2], i.e., "rotated 90 degrees clockwise" [2] http://www.unicode.org/Public/vertical/revision-17/VerticalOrientation-17.txt

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