[css-ruby] Add "text-orientation: upright" for bopomofo annotation

• From: Xidorn Quan <quanxunzhen@gmail.com>
• Date: Tue, 25 Aug 2015 22:59:49 +1000
• To: www-style list <www-style@w3.org>
• Message-ID: <CAMdq69_bnsiM6UPTAuTKE+oj2HXbSh5RBZqO60ivx7drDswshg@mail.gmail.com>

Hi,

I propose that we should add "text-orientation: upright" to the
"rt:lang(zh-TW)" rule.

The reason is that, all the tone marks in bopomofo (U+02CA, U+02C7,
U+02CB, U+02D9) have Vertical_Orientation property "R" while the
bopomofo characters are all "U". It means, without explicitly setting
text-orientation to upright, the text run would break between them,
which makes it impossible to use font feature to place the tone mark
properly.

- Xidorn

Received on Tuesday, 25 August 2015 13:00:56 UTC