3.8.2 Cursor movement rules
https://w3c.github.io/mlreq/#cursor_movement

This section says:

Striking cursor movement keys on the keyboard, including “←”, “→”, “↑”, “↓”, “Page Up”, “Page Down”, “Home” and “End”, should produce movement that follows the writing direction of the Mongolian script from top to bottom and from left to right

It then goes on to say that the result of pressing a cursor key should be for the cursor to move in the same direction as the arrow, ie. “←” moves the cursor to the previous line.

In Western keyboards, “Page Up”, “Page Down”, “Home” and “End” move relative to the start/end of the text, rather than the absolute directions described for the cursor keys. Is this not the same for Mongolian text? (ie. shouldn't Page Down jump to the right, rather than vertically downwards?)