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From: "R.Wieser" <address@is.invalid>
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Fri, 31 May 2024 16:34:08 +0200
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Andy,

>>> So I guess you'd need to figure out what version of XHTML you have and
>>> then get the docs for it.
>>
>> :-)  Yep, thats what I've been trying to do.
>
> <https://www.w3.org/TR/epub>

I found a few myself :

http://idpf.github.io/epub3-samples/30/samples.html

https://idpf.github.io/epub-cmt/v3/

https://www.w3.org/publishing/epub32/epub-contentdocs.html

https://www.w3.org/AudioVideo/ebook/

https://www.w3.org/2010/04/xhtml10-strict.html

https://epubknowledge.com/docs/xhtml-general/

https://www.yourhtmlsource.com/accessibility/xhtmlexplained.html/

..... and somehow none of them actually mention which tags XHTML supports, or 
which tags are/must be supported by EPUB books (which I do not automatically 
consider to be the same set). :-(

And assuming that there are different XHTML versions that EPUB readers 
should support, I have not found any specs to them either.

Regards,
Rudy Wieser