[Tex2002ans]

Originally Posted by MicroDrie

Unfortunately I haven't seen a single brenchmark for Epub readers yet.

EPUBTest.org.

Their older website (pre-2017) used to have compatibility/functionality tests across lots of devices/apps. (Similar to CanIUse.com for HTML+CSS.)

They were testing all sorts of things in the EPUB specs like:

• HTML5
  
  • <audio>/<video>, <figure>, <article>, <section>, ...
• CSS3
  
  • Counters, calc(), ...
• MathML
• SVG
• Media overlays
• alt text
• hidden in the <spine>
• [...]

I wrote about it most recently in:

• 2019: "Font Best Practices"
  
  • Talking about WOFF/WOFF2 support.
• 2021: "Google Play Books and Nested Lists - Some Weird Display Issue"
  
  • Talking about the horrors of <ol> + Google Play's absolutely atrocious "EPUB" code output.

Originally Posted by MicroDrie

And so unfortunately the development of an Epub reader is stuck on a digital plain text version of a paper book where you can be happy that the Epub reader can be displayed with many limitations with perhaps some text formatting and a video.

I also discussed this to death years and years ago:

• 2017: "Indexes without page numbers?"

At the time, I thought AZARDI / Infogrid Pacific had a fantastic EPUB/ebook analysis in their old blogposts.

If I remember correctly, they used an analogy:

"Currently, ebooks are like looking at a book under a piece of glass."

AZARDI was then describing ways to display+look through the ebooks in a more useful way.

Ebooks should be ENHANCEMENTS on top of a physical book, not just a "glass" replacement.

(Of course, I still love ebooks and am a 100% ebook reader, but the blog did make many good points.)

• 2013: Infogridpacific.com: "IDPF Index Spec. Deconstructed"
  
  • "Indexing and eIndexing, IDPF, ePub3, Specification, Analysis, Opinion"

Since then, there's been slow, but steady progress in some of these areas.

(Like popup+bottom-of-the-screen footnotes or multi-language support.)

But yep, there can definitely be more ebook-only enhancements.

- - -

Side Note: Personally though, I think <audio> + <video> ARE NOT one of those features.

See my posts in:

• 2019: "(sigh), Kindle/KPF format Blues..."

where I described many of those "INTERACTIVE/MULTIMEDIA EBOOKS" failures over the decades. (Kindle-in-Motion, etc.)

- - -

Side Note #2: On AZARDI + their old blog...

I remember during the introduction of EPUB3 + merging of IPDF with W3C, they also had very good posts on the "wrong direction" EPUB3 was taking.

They were bringing up many important points that are still relevant today.

(Now, this info is very hard to find, because the old URLs are mostly dead. You'd have to use Archive.org to recover them.)

Originally Posted by MicroDrie

The fact that the poster is not displayed on the Moon reader, but is displayed correctly on Sigil, leads me to the conclusion that the code is good, but that the Moon reader does not support a poster with a video.

Moon+ Reader is abysmal. They do not follow the EPUB specs. They completely override everything and try to force the book into their mold.

I most recently described this again in:

• 2021: "Moon+Reader and tables"

Here's a piece of one of my posts:

Originally Posted by Tex2002ans

Moon+ Reader is horrible. I've written about why many times over the years. Some reasons:

• No <table>s
• No SVG
• Completely overriding publisher CSS
  
  • Breaking essential formatting like poetry + scenebreaks.
• Locking Text-to-Speech (TTS) behind paywall.

[...]

Originally Posted by MicroDrie

If someone does have a poster view for a video, I'm very curious about the code of that Epub.

Most likely similar code to what's online and works in web browsers... except no EPUB3 readers (except maybe latest version of iBooks + Readium) would support such a thing right now.