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> CSS text-orientation rules with decent browser compatibility

I don't think the support is really there for vertical writing systems.

Posted earlier in the discussion, the Mongolian President's website works well for me, in Firefox on Linux.

The mouse scroll scrolls right, selecting text works (with a horizontal cursor), the western text (dates, numbers and "Covid-19") embedded in the text are appropriately rotated.

"View source" shows the source text, and it doesn't look like there are any nasty tricks to support this.

Is anything missing?

https://president.mn/mng/

For me, the mouse scroll doesn't work unless I enable Javascript for the site (I run NoScript). So, at least that aspect seems to be reliant on some kind of JS-based workaround, not CSS itself.

It's not as convenient, but you can always scroll horizontally with shift.

I think we can say it is. writing-mode in particular has full support in all modern browsers, and some support in IE back to version 6: https://caniuse.com/#feat=css-writing-mode

In theory, yes, in practice (I speak from experience) it has a massive amount of bugs when you actually try to use it for something that is not completely trivial. And the bugs are different for every browser, so working around them is pretty much intractable.

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