Re: Popup footnotes in EPUB 3

When I looked into this around 2016, I remember that Apple Books did
not function correctly if there were tags inside a footnote. I have not
checked the current situation.
However, at that time, the footnotes required for Japanese books needed
ruby annotations and links.
For this reason, our EPUB conversion tool chose to represent footnotes
using mutual links instead of the footnote element. This method offers
high interoperability.
Therefore, if the definition of footnote is to be revised, it should
allow tags such as ruby annotations and links inside the footnote.

Below is a sample:
https://github.com/toshiakikoike/epub_file/blob/master/kumonoito-footnote/OEBPS/text/book_0003.xhtml


<p>....ふと下の<ruby>容子<rt>ようす</rt></ruby><a id="ref_fn_1"
href="#fn_1"><span class="noteref"><span
class="upright">＊</span>１</span></a>を御覧になりました。...</p>
.......
<hr />
<div id="fn_1" class="footnote">
<p><a href="#ref_fn_1"><span class="upright">＊</span>１</a>　
<ruby>容子<rt>ようす</rt></ruby>……「<ruby>様子<rt>ようす</rt></ruby>」のこと。参考リンク→<a
href="https://dictionary.goo.ne.jp/word/%E6%A7%98%E5%AD%90/">goo辞書</a><
/p>
</div>


2025-03-05 (水) の 15:55 +0100 に Laurent Le Meur さんは書きました:
> Hello, 
> 
> Please read https://github.com/edrlab/thorium-reader/issues/2833 and
> Daniel's comments about the lack of specification of popup
> footnotes. 
> I found definitions for "footnote" and "noteref" in the EPUB 3.3
> spec, but nothing related to popup footnotes in the RS spec.
> The upcoming work on EPUB 3.4 seems like a good time to properly
> specify popup footnotes. 
> 
> Best regards,
> Laurent Le Meur | EDRLab
> 
> 
> 
> 
> 

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