Effect of hidden=""

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I have hidden="" on li elements that we do not want appearing in the toc page in the text flow of the book but which could be handy in the built-in navigation feature of a reading system (e.g., cover, copyright, etc.)

Readium currently hides these elements both in the page that is in the text flow and in the navigation list to the left of the screen. Is this deliberate or a bug? The EPUB validates and appears to be marked up correctly, unless hidden="" is not intended for li elements. This line from the EPUB 3.0 spec makes me think it is a bug:

"The hidden attribute has no effect on how navigation data is rendered outside of the content flow (such as in dedicated navigation user interfaces provided by Reading Systems)."



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