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>but it can’t validate CSS against a renderer which is fundamentally broken! The epub standard doesn't say what version of CSS must be supported. There were no guarantees modern CSS would work so I wouldn't call the renderer broken.
Ignore != Fatal error
I used EPublish for my first novel, Means and Motive, just published here, DRM-free: https://www.amazon.com/dp/B0GYCZJVGX
So far I haven't heard of compatibility issues, so I think EPublish has hit the sweet spot of EPUB targeting. I agree, however, that it feels like the old days of targeting IE6 on the web. Old readers still exist out there, so we have to aim for the lowest common denominator.
TBH i've being using an ePub reader that i occasionally had to edit ePub files so i get rid of the superfluous styling that made it either not work or show things weirdly/wrong and i've heard comments from others that a bunch of files i had no issues with personally were unreadable for them, which makes me think that unless you really and absolutely need any fancy formatting (i.e. math stuff that can't just be made images - and you really tried to!) then you should stick with the most basic HTML imaginable - things that not even IE4 would render (too) wrong.
And in turn, since i doubt this will ever happen, i sometimes ponder making an "epub reconstruct" tool that attempts to reconstruct epubs so that they use the simplest HTML/CSS :-P (ideally configurable for maximum compatibility).
Adobe has always been like this, too. They squandered an enormous marketshare with Flash because the alternative would've been spending a couple million on QA and they managed to unite all of the browser manufacturers in agreement that the web was better off without such an unreliable partner. I shipped a couple of things on Flash back in the day but it was staggeringly bad software — random crashes, various heisenbu…
JavaScript build system layer cake and "web standards" are a million times harder than just drawing some stuff, maybe writing a simple function, then building a static file that can be embedded anywhere and even downloaded. You have to spend so much time setting up any flash alternative, and the "standards" are worse.
I hate Steve Jobs for killing Flash and Adobe for being such awful stewards of one of the most amazing web technologies.
Kids growing up today have no idea how magical Flash was. It was like Roblox or Minecraft for web.
Websites are still inferior to Flash of the early 2000s. It's taken decades and they can only mimic a fraction of its power. And none of its ease.
Earlier quoted context omitted.
The lovecraftian horror of pdf mostly comes into play through the sheer amount of software that supply almost correct pdf. It's not enough to be able to read pdf anymore, you also have to be able to deal with software that emits subtly wrong documents.
Adobe really have perfected act of making the most shoddy software that is still possible to sell
https://b3n.org/psd-is-not-my-favourite-file-format/
or in the code:
It's always CSS.
It looks like not a whole lot has changed in that space -- the readers are still the gate for what you can do with the format. Who's available to make a CanIUse for epub readers, to shame them into compliance? (only partly /s)
AIUI, Kobo devices have a more advanced rendering engine if you name the file with .kepub.epub. (I think it's based on ePub 3?) Not sure if it would fix the problem here. But I personally run ePubs through kepubify ( https://pgaskin.net/kepubify/try/ ) before transferring them to my Kobo.
I love my Kobo (clara colour) and really, if they just removed the Adobe reader, it'd be perfect. And yes, I've tried KOreader, but never switched to it because I like my Overdrive library books and Kobo Store.
Be happy your readers use an ePub reader that supports (or at least, ignores) something like `max-width` in the first place :-P. TBH i've being using an ePub reader that i occasionally had to edit ePub files so i get rid of the superfluous styling that made it either not work or show things weirdly/wrong and i've heard comments from others that a bunch of files i had no issues with personally were unreadable for them…