> Incidently, I saw Japanese text recently that was quoting both English AND Arabic in the same sentence. And this was in a block of vertical text. That is literally a worst-case scenario I think.
Look up Mongolian script and you might change your mind :)
Oh Lord. I just looked it up on Wikipedia. It's a vertical-only language for a start. How do you even discuss a vertical-only language in a language which is horizontal? Wikipedia has to write all the script horizontally, which would be like a page talking about English stacking all the letters vertically - it's weird.
From Wikipedia: "Computer operating systems have been slow to adopt support for the Mongolian script, and almost all have incomplete support or other text rendering difficulties."
Look up Mongolian script and you might change your mind :)