Hi,
Here is a link to some epub examples of japanese vertical (tate) and horizontal.
http://www.kobu.com/docs/epub/index-en.htm
Hope that the css will help you:
Code:
body {
writing-mode: vertical-rl;
-epub-writing-mode: vertical-rl;
-webkit-writing-mode: vertical-rl;
line-break: normal;
-epub-line-break: normal;
-webkit-line-break: normal;
}
The epub is perfectly displayed in vertical in sigil 0.7.0 (win xp with japanese font... not really sure which one is actually used by sigil)
François
PS: I might have found this link in another thread of this site, but I couldn't find it again (sorry for the credits)