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w3c / jlreq

Text Layout Requirements for Japanese
https://w3c.github.io/jlreq/
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3.2.2: On the western word space of JLReq #179

Open yuw opened 4 years ago

yuw commented 4 years ago

In Section 3.2.2 Mixed Text Composition in Horizontal Writing Mode https://www.w3.org/TR/jlreq/#mixed_text_composition_in_horizontal_writing_mode:

Note that Western word space (cl-26) is a one third em space

I think it more better to have the width of the U+0020 of the font used on Latin text. The current description of this “one third em space” (as em width of Japanese characters?) I consider too artificial.

“Note 4” (https://w3c.github.io/jlreq/#h-note-94) may already point out this point, but I couldn't clearly understand it.

And, I think this topic is related to issue #163.

kidayasuo commented 4 years ago

I think the description needs clarification. Basically the width of the space character U+0020 is up to the font designer. Is this (1/3 of a fullwidth) a recommendation?

With a few fonts I looked at, the width of U+0020 ranges from 1/4 to 1/3. With typical Latin fonts (e.g. Helvetica, Times) it is closer to 1/4, and with typical Japanese fonts it is closer to 1/3. In either case the actual width varies with fonts and not exactly 1/3 of a fullwidth.