PageUp and PageDown, etc, direction

[r12a]

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?)

[xfq]

Feedback from a professor at the Inner Mongolia University:

有的网站是横向滚动的，有的网站是纵向滚动的，如果是横向滚动的话，Page Up和Page Down应该左右移动。

关于Page Up和Page Down，我们也要看是在Word里还是网页里，如果是在Word里，应该和其他文字一样的。

关于Home和End，这两个键会将光标定位到本行的最前面或最后面，因为蒙文是竖排，所以Home把光标定位到最上面，End把光标定位到最下面。

And here's my translation:

Some websites are scrolled horizontally, while some websites are scrolled vertically. If the web page is scrolled horizontally, Page Up and Page Down should jump to the left or right.

Regarding Page Up and Page Down, we also need to see whether it is in Word or in a web page. If it is in Word, the direction of movement should be the same as text in other languages.

Regarding Home and End, these two keys will move the cursor to the beginning or the end of the line. Because the Mongolian is written vertically, the Home key move the cursor to the top and the End key moves the cursor to the bottom.