Lacks documentation on support for right-to-left languages

[elmimmo]

The document lacks overall support for non Latin scripts and the idiosyncrasies of right-to-left languages. Amongst others, it lacks mention of:

• Support for the OPF's spine element's page-progression-direction attribute, for right-to-left pagination flow.
• Support for the writing-mode CSS3 property (or equivalent), for vertical left-to-right or vertical right-to-left text layouts, and related CSS3 properties such as text-combine-upright (or equivalent)
• Support for HTML's dir attribute, and related bdi and bdo elements, for hardcoding base text direction irrespective of CSS styling, as well as its interactions/collisions with the Unicode Bidirectional Algorithm.
• Support for ruby text (a.k.a. Japanese furigana).

Readings related to some of the above:

• EPUB 3 and Global Language Support
• Right-To-Left Text in Markup Languages
• Unicode Bidirectional Algorithm basics
• html5′s new bdi element
• Creating HTML Pages in Arabic, Hebrew and Other Right-to-left Scripts

Feel free to split this issue in multiple issues if appropriate.

[Wendy Reid]

I have updated the spec to reflect our support in this area. Let me know if there is anything else we can elaborate on!