[Conversion Output] KFX Output

[Zillion_]

Hello, I have an issue trying to use :has() pseudo-class selectors in e-books.

Example:
.ChapterS:has(+.SubChapter) {
margin-bottom: 1em !important;
color: red !important;
}

The Kindle conversion logs show this:

Reading TOC from NCX...
Merging user specified metadata...
Detecting structure...
Inserting metadata into book...
Flattening CSS and remapping font sizes...
Ignoring CSS rule with invalid selector: '.ChapterS:has(+ blockquote)' (The pseudo-class :has() is unknown)
Ignoring CSS rule with invalid selector: '.ChapterS:has(+ .ChapterLocation)' (Expected an argument, got <DELIM '.' at 16>)
Ignoring CSS rule with invalid selector: '.ChapterS:has(+ .SubChapter)' (Expected an argument, got <DELIM '.' at 16>)
Ignoring CSS rule with invalid selector: '.ChapterS:has(+ blockquote)' (The pseudo-class :has() is unknown)
Ignoring CSS rule with invalid selector: '.ChapterS:has(+ .ChapterLocation)' (Expected an argument, got <DELIM '.' at 16>)
Ignoring CSS rule with invalid selector: '.ChapterS:has(+ .SubChapter)' (Expected an argument, got <DELIM '.' at 16>)
Ignoring CSS rule with invalid selector: '.ChapterS:has(+ blockquote)' (The pseudo-class :has() is unknown)

Calibre supports them correctly for the display in the editor (text displays correctly, tested with some color tags) but the conversion doesn't.
Is this an issue in Calibre or in KFX Output ? (unclear to me)

[jhowell]

Originally Posted by Zillion_

Hello, I have an issue trying to use :has() pseudo-class selectors in e-books.
...
Calibre supports them correctly for the display in the editor (text displays correctly, tested with some color tags) but the conversion doesn't.
Is this an issue in Calibre or in KFX Output ? (unclear to me)

The error messages that start with "Ignoring CSS rule with invalid selector" are produced by calibre's conversion pipeline, not by this plugin. If you instead convert the same book from EPUB to AZW3 (therefore not using this plugin) you will see the same errors and will also see that calibre strips out those pseudo-classes during conversion.

Even if you avoid calibre's removal of those pseudo-classes by using the CLI of this plugin it still will not work because they are also unsupported by Amazon and will be silently discarded by Amazon's Kindle Previewer during conversion.

[tomsem]

Originally Posted by jhowell

There are also numerous, serious bugs in Kindle Previewer 4 that have not yet been fixed in the three quickly released updates to it. (I guess that Alexa is just not the best choice to use when vibe coding.)

Presumably these bugs are shared by Send To Kindle? Might be interesting to compare them.

[jhowell]

Originally Posted by tomsem

Presumably these bugs are shared by Send To Kindle? Might be interesting to compare them.

Most of the bugs seem to have been introduced in attempting to update to x64 MSIX in Windows and ARM in macOS. As far as I can tell the conversion done in Amazon’s servers for send-to-kindle happens under Linux and so it is not affected.

[tomsem]

Originally Posted by jhowell

Most of the bugs seem to have been introduced in attempting to update to x64 MSIX in Windows and ARM in macOS. As far as I can tell the conversion done in Amazon’s servers for send-to-kindle happens under Linux and so it is not affected.

That makes sense.

The three epub books that I reported problems with upthread, with entity in alt text are passing muster with STK (as well as Kindle Previewer 4.x). They were not passing when I tried the 3 ePubs weeks ago.

[jhowell]

Originally Posted by tomsem

That makes sense.

The three epub books that I reported problems with upthread, with entity in alt text are passing muster with STK (as well as Kindle Previewer 4.x). They were not passing when I tried the 3 ePubs weeks ago.

They are definitely fixing some of the conversion problems. If they would just fix the handling of SVG images I would strongly recommend upgrading to 4. As it is now it’s a toss up between 3 and 4 for the books I test with.