html editor, right to left, arabic

[Hendrik Reimann]

Hello,

I'm working on a simple html editor. I have the task, to make an Arabic version of this editor. I have no clue about Arabic, but I do know it is written from right-to-left. So I wonder, should I set the writing direction for my editor area to right-to-left.
Arabic text is written right-to-left, but when the text is mixed with normal html tags, which contain latin characters, the whole thing looks very odd.

If you know Arabic, please let me know
- how do typical html editors behave in an Arabic version? Is the whole editor right-to-left?

Just to give you context. Normally my html is used by English people, however I got contacted by one customer who really wants an Arabic version of my editor. I didn't ask him if he wants right-to-left or left-to-right in the Arabic version, because I want to do the same what the majority of html editors on the market for Arabic people do, so it will be useful to the majority of Arabic people.