- From: Gérard Talbot <www-style@gtalbot.org>
- Date: Fri, 29 Aug 2014 22:47:59 -0400
- To: Koji Ishii <kojiishi@gluesoft.co.jp>, fantasai <fantasai.lists@inkedblade.net>
- Cc: W3C www-style mailing list <www-style@w3.org>
Le 2014-08-27 23:43, Gérard Talbot a écrit : > Hello, > > " > In vertical writing mode, the central baseline is used as the dominant > baseline when text-orientation is mixed or upright. > " > http://www.w3.org/TR/css-writing-modes-3/#text-baselines > > I do not understand how and why there can be a central baseline for > text with 'text-orientation' set to 'upright'. How can this be? > > This image > > http://www.w3.org/TR/css-writing-modes-3/text-orientation-up.png > > of vertical text in 2 line boxes has text-orientation set to upright. > > Now, how can the baseline-alignment of glyphs be using the central > baseline here? > > Gérard I may have stumbled on a possible explanation: " Ideographic (cl-19), hiragana (cl-15) and katakana (cl-16) characters are the same size, and have square character frames of equal dimensions. " 2.1.2 Kanji, Hiragana and Katakana http://www.w3.org/TR/jlreq/#kanji_hiragana_and_katakana " Ideographic (cl-19), hiragana (cl-15) and katakana (cl-16) characters for Japanese composition have basically been designed to have a square character frame from the letterpress printing era on. " 2.3.1 Directional Factors in Japanese Composition http://www.w3.org/TR/jlreq/#directional_factors_in_japanese_composition If this is the case, then a central baseline can be determined for text with 'text-orientation' set to 'upright' but is this feature (characters designed to have a square character frame) also the case for other vertical scripts? Gérard
Received on Saturday, 30 August 2014 02:48:30 UTC