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[ttml2] Default directions in mixed textOrientation should use TR50

From: r12a via GitHub <sysbot+gh@w3.org>
Date: Mon, 13 Mar 2017 20:02:08 +0000
To: public-tt@w3.org
Message-ID: <issues.opened-213880964-1489435327-sysbot+gh@w3.org>
r12a has just created a new issue for https://github.com/w3c/ttml2:

== Default directions in mixed textOrientation should use TR50  ==
10.2.46 tts:textOrientation

> If the value of this attribute is mixed, then, in vertical writing modes, glyphs from horizontal scripts are set sideways, i.e., 90° clockwise from their nominal orientation in horizontal text, while glyphs from vertical scripts are not affected.

The terms 'vertical scripts' and 'horizontal scripts' don't appear to have any definition.

I think this paragraph should actually say that the defaults specified in http://www.unicode.org/reports/tr50/ should be applied for mixed text.

Note that there are also implications for fullwidth Latin characters, and for punctuation, which don't appear to be captured by the text in the TTML spec.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/279 using your GitHub account
Received on Monday, 13 March 2017 20:02:14 UTC

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