Unwanted page breaks being inserted

Phssthpok · 01-10-2017, 07:40 AM

I edit books as ePUBs and convert them to AZW3 to read them on my Kindle. Usually I want a page break between each file in the ePUB, and have a CSS style for <body> with "page-break-before: always". But in a few recent cases the files are over the 260K-ish limit, so I moved the page-break-before to a ".page" class and used <body class="page"> on files where I wanted a page break, and <body> on the others. When these are converted to AZW3, I still get a page break on every file.

Looking at Prefs > Conversion > Common Options > Structure Detection, I see I have "Detect chapters at: /" and "Insert page breaks before: /" to disable any auto-cleverness of this sort. Looking at the AZW3, I see that <body> in the ePUB gets changed to <body class="calibre3">, and the rules for ".calibre3" and ".page" are identical, without a "page-break-before" styling:

Code:

.calibre3 {
    display: block;
    font-size: 1em;
    padding-left: 0;
    padding-right: 0;
    text-align: justify;
    margin: 0 36pt
    }

.page {
    display: block;
    font-size: 1em;
    padding-left: 0;
    padding-right: 0;
    text-align: justify;
    margin: 0 36pt
    }

Is there something else that I should do, or is this yet another unavoidable Amazonian weirdness?

kovidgoyal · 01-10-2017, 08:09 AM

File boundaries are always page breaks there is nothing you can do about that.

Phssthpok · 01-10-2017, 08:20 AM

Quote:

Originally Posted by kovidgoyal

File boundaries are always page breaks there is nothing you can do about that.

Thanks. I thought on some older devices there was a hard 260K-ish file size limit, but I see that the info message in "Check Book" only says "Too large HTML files can cause performance problems on some ebook readers. Consider splitting this file into smaller sections."

I seem to have a choice between continuous flow or possible performance problems. I'd like to stick with continuous flow if possible, but can anyone tell me more about the performance trade-off? What happens in general with a (say) 1MB file?

kovidgoyal · 01-10-2017, 09:14 AM

It depends, anything from refusing to open the book, to slow page turns, long initial render time, and so on. Having very large HTML files is not a good idea, it unneccessarily stresses mobile devices, wastes battery life, etc. The longer the file the more work the renderer has to do to re-render it every time something changes.

01-10-2017, 07:40 AM	#1
Phssthpok Age improves with wine. Posts: 571 Karma: 95229 Join Date: Nov 2014 Device: Kindle Oasis, Kobo Libra II	Unwanted page breaks being inserted I edit books as ePUBs and convert them to AZW3 to read them on my Kindle. Usually I want a page break between each file in the ePUB, and have a CSS style for <body> with "page-break-before: always". But in a few recent cases the files are over the 260K-ish limit, so I moved the page-break-before to a ".page" class and used <body class="page"> on files where I wanted a page break, and <body> on the others. When these are converted to AZW3, I still get a page break on every file. Looking at Prefs > Conversion > Common Options > Structure Detection, I see I have "Detect chapters at: /" and "Insert page breaks before: /" to disable any auto-cleverness of this sort. Looking at the AZW3, I see that <body> in the ePUB gets changed to <body class="calibre3">, and the rules for ".calibre3" and ".page" are identical, without a "page-break-before" styling: Code: .calibre3 { display: block; font-size: 1em; padding-left: 0; padding-right: 0; text-align: justify; margin: 0 36pt } .page { display: block; font-size: 1em; padding-left: 0; padding-right: 0; text-align: justify; margin: 0 36pt } Is there something else that I should do, or is this yet another unavoidable Amazonian weirdness?

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01-10-2017, 08:09 AM	#2
kovidgoyal creator of calibre Posts: 44,163 Karma: 22670164 Join Date: Oct 2006 Location: Mumbai, India Device: Various	File boundaries are always page breaks there is nothing you can do about that.

01-10-2017, 09:14 AM	#4
kovidgoyal creator of calibre Posts: 44,163 Karma: 22670164 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It depends, anything from refusing to open the book, to slow page turns, long initial render time, and so on. Having very large HTML files is not a good idea, it unneccessarily stresses mobile devices, wastes battery life, etc. The longer the file the more work the renderer has to do to re-render it every time something changes.

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