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

One confirmation; if we were to propose a change, should the first tone
mark also included? From wikipedia[1], I understand Bopomofo does not use
the first tone mark but Pinyin does.

Better to include but not required for Bopomofo usages?

[1] https://en.wikipedia.org/wiki/Bopomofo#Tonal_marks

/koji

On Thu, Aug 27, 2015 at 4:24 PM, fantasai <fantasai.lists@inkedblade.net>
wrote:

> On 08/26/2015 12:05 AM, Xidorn Quan wrote:
>
>> On Wed, Aug 26, 2015 at 12:15 AM, fantasai
>> <fantasai.lists@inkedblade.net> wrote:
>>
>>> On 08/25/2015 02:59 PM, Xidorn Quan wrote:
>>>
>>>> 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.
>>>>
>>>
>>> I think it would make more sense to have Unicode update UTR50 to make
>>> these characters upright in mixed-orientation text (or otherwise tailor
>>> it within CSS as a whole). It's not just a problem with ruby.
>>>
>>
>> Well, that could be tricky, because those characters might also be
>> used with latin scripts. I'm not sure anyway.
>>
>
> Latin mostly uses the combining-mark form, rather than the modifier
> letter form. Also for mixed vertical text, we're biased mostly towards
> CJK usage (which bopomofo counts as). So I think we're okay.
>
> Still would like Unicode signoff, too, of course.
>
> ~fantasai
>