Greco In my dokuwiki, I discovered italic would work if I enclosed Japanese with monospaced.
So, below would work.
//''斜体''//
But this one wouldn't work.
//斜体//
Now, I realized the syntax here is different from my dokuwiki.
Here, italic is
italics
In my dokuwiki,
//italic//
The forum software is indeed another software then Dokuwiki, it shows at least that it could work ;-)
Monospace is another font. Might be we should request another font(family) as well for italic text.
I have no experience with how Japanese font should be handled in css/html. If developers with experience can share some light, you are welcome.
For me this looks as something that can be improved on our side, so please file a bug report with what works and did not work for you.