Re: [css3-writing-modes] text-orientation: upright for fonts without vertical metrics (was RE: Western vertical texts

On 3/6/2012 5:02 PM, Koji Ishii wrote:
> I noticed, if code points are CJK but the font lacks vertical metrics, Mac WebKit assumes it's a square glyph and use horizontal advances as vertical advances. It only works for CJK code points and therefore will not work for PUA.

Furthermore, using horizontal advances as proxies for vertical advances 
works only for square designs.

I believe that most non-square designs are "narrow" (width < height). I 
also believe that regardless, the biggest of {width, height} is about 
1em. The result of using horizontal advances is therefore going to be 
overlap of the glyphs.

Eric.