mongolian
Test passes if the order of characters and paragraphs and the angle of characters is the same.
ᠬᠤᠯᠤᠭᠠᠨᠠ ᠡᠨᠳᠡ ᠡᠨᠡ ᠭ᠋ᠠᠯ ᠴᠢᠷᠢᠭ ᠬᠠᠨᠠ
ᠤᠷᠲᠤ ᠡᠨᠳᠡ ᠡᠨᠡ ᠭ᠋ᠠᠯ ᠴᠢᠷᠢᠭ

Assertion: [Exploratory test] Setting writing-mode to tb-lr will cause Mongolian text to run vertically down the left size of a box, with upright characters, and wrap to the right, and cause paragraphs to flow to the right.
The tb-lr value of writing-mode is deprecated in favour of vertical-lr.
vertical-text-103
Result summary & related tests