Re: [csswg-drafts] [css-writing-modes] Support vertical CJK + ttb Arabic (rtl scripts generally) (#3608)

@frivoal 

> As for Sogdian and Old Uyghur, aren't they already supported, as Mongolian and Manchu are, using `writing-mode: vertical-lr`? (and if not, why not?).

As @dscorbett has pointed out, the commonly implemented vertical layout mechanisms basically rotate a horizontal line 90 degrees (clockwise, typically) to create a vertical line, without rework bidi flows. The result is that RTL scripts have no way to be rendered in the same TTB inline direction in vertical lines as how LTR scripts are.

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Received on Saturday, 23 March 2019 11:28:00 UTC