When vertically-set Mongolian text contains a select element, the control will be vertical, and multiple options will extend, vertically-set, towards the right.

[r12a]

Test link(s):

test

Results:

• Gecko: ✅❌ Initial setup looks OK. However, options panel is horizontal. Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:125.0) Gecko/20100101 Firefox/125.0
• Blink: ✅❌ Initial setup looks OK. However, options panel is horizontal. Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36
• Webkit: ✅❌ Initial setup looks OK. However, options panel is horizontal. Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15

Related tests: Vertical text