Re: [css-writing-modes] Propose to weaken upright rendering of horizontal-only scripts

On 05/19/2015 12:20 AM, fantasai wrote:
> Jonathan Kew wrote:
>> What's less clear, IMO, is how to handle the complex Indic scripts
>> where reordering and clustering behavior is involved.
>
> Yes, this is a fair criticism. I think the default behavior should
> be to break the text into grapheme clusters, and render each upright
> individually. For cases where this is known to be incorrect, and
> more correct rules are known (e.g. per-syllable), then those rules
> override this default rule.
>
>> I agree there are gaps in our knowledge of how best to render some
>> scripts in this mode, but rather than weakening the current spec
>> text, which I think is OK as far as it goes, perhaps we should
>> just have a note that the behavior of complex scripts such as
>> Indic and SE Asian in vertical upright is not clearly defined yet.
>
> Again, agreed. And we should add that note. :)

I rebased the Writing Modes spec on the definition "typographic
character unit" from CSS3 Text:
   https://drafts.csswg.org/css-text/#characters

Let me know if you think we need further clarification.

~fantasai