From Kobo's documentation at
https://github.com/kobolabs/epub-spe...r-than-english
Quote:
Languages Other Than English
When a user selects an available default font, Kobo reading platforms may not correctly render all glyphs within the script. So Content containing glyphs not present in Kobo’s default apps should be tested across platforms. Creators may want to embed a font that contains the glyphs used in their content to ensure it renders correctly.
Some glyphs do not render on most fonts. In cases where creators are unable to supply embedded fonts they can insert a note into the front matter of their content instructing users to select the font Georgia. It correctly renders the greatest set of scripts.
Kobo is currently working to add built-in fonts to the eInk and Android-reading platforms and render glyphs from all scripts correctly. The Desktop, iOS and Windows 8 platforms already contain built-in fonts that will render glyphs from all scripts.
Kobo has support for right-to-left language formatting in the following areas:- Kobo supports the OPF spine-level page-progression-direction attribute for right-to-left page flow
- Kobo supports the writing-mode CSS3 property and associated elements for vertical text layouts (LTR or RTL)
- Kobo supports the HTML5 dir attribute
- Kobo supports ruby text*
*This support excludes the Windows 8 platform.
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