There's a 100% vertical writing mode demo here:
(Blog post about it here:

On Monday, April 9, 2018 at 11:39:34 AM UTC-4, masayuki nakano wrote:
> Hi,
> I'm currently reviewing bug 1358017 which tries to scroll vertical 
> writing mode contents horizontally with vertical mouse wheel operation 
> for some mice which have only vertical wheel and etc.
> I'd like to check actual behavior with actual devices on web sites which 
> use vertical writing-mode in real world before making it enabled in 
> release channel.
> Does somebody know some lists of web sites which use vertical 
> writing-mode? Unfortunately, I don't know web sites which use 
> writing-mode heavily even though I usually read web sites written in 
> Japanese...
> -- 
> Masayuki Nakano <>
> Software Engineer, Mozilla

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