Quote:
Originally Posted by voom
Most of the standard epub3 would probably work as most features can fall back to something an epub2-reader can understand; for TOC at least if the author adds the toc.ncx as well, which is allowed for fallback.
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Indeed, but consider that also basic HTML format is different: from (theoretically) XHTML 1.1 or similar to HTML5 + CSS5 + SVG (and maybe even MathML, I don't remember). So... not so simple, I think. It's probably easier to work in parallel on a new viewer software to add "one shot" within a firmware update that to go by steps... I think.