Install the Code2000 font to view the results.
arabic in chinese
Test passes if the order and rotation of Arabic characters is the same, and the letters are joined in the same way.
Assertion: Setting writing-mode to tb-rl will cause Arabic text embedded in vertical Chinese to flow up the page, with letters rotated to the right, and wrap to the left, such that the Arabic lines are read right to left, and the letters join correctly.
= means you should check that the test and reference graphic look the same. If not, check the instruction text.