MobileRead Forums - View Single Post - is an undefined css class an error

stumped · 03-26-2020, 01:06 PM

some context. I have been trying to better understand why/when calibre introduces the css class pcalibre1 during a conversion.
I am asking here as sigil is my preferred investigation tool...

So, looking through various books, for usage of pcalibre1,
I find a book in my library which has the code
<p class="pcalibre2 pcalibre1"> for 1st line of each chapter

but there is no definition of pcalibre2 that I can find. Definitely not in the css sheet according to "find". Only pcalibre1 is defined, and there are no inline class definitions either
so I try all the various epub check type tools in sigil to see if the missing definition gets flagged as an error - but it doesn't- and the book renders normally.
I also tried the check/repair tools in the calibre editor and they do not report a missing definition either

so are undefined css classes generally safe to leave in?

[ just in case the definition is there, and I am just going blind, I then deliberately sabotaged the code by changing pcalibre2 to pcalibre3 - which for sure is not defined, and re ran all the checks. Every one passed OK ]

I am assuming for now that I must have accidentally deleted the definition somehow, because the alternative - that calibre adds undefined classes - seems very unlikely

this is the opposite of having an unused css class. its having an undefined css class

is there any tool which will flag up such cases that I can use- either in sigil, or outside of ?
will having undefined class(es) crash or confuse some renderers?

03-26-2020, 01:06 PM	#1
stumped Wizard Posts: 3,305 Karma: 10259306 Join Date: May 2016 Device: kobo forma, Kobo Libra, Huawei media Tab, fire HD10, PW3 HDX8.9,	is an undefined css class an error - and is there a detecrtion tool some context. I have been trying to better understand why/when calibre introduces the css class pcalibre1 during a conversion. I am asking here as sigil is my preferred investigation tool... So, looking through various books, for usage of pcalibre1, I find a book in my library which has the code <p class="pcalibre2 pcalibre1"> for 1st line of each chapter but there is no definition of pcalibre2 that I can find. Definitely not in the css sheet according to "find". Only pcalibre1 is defined, and there are no inline class definitions either so I try all the various epub check type tools in sigil to see if the missing definition gets flagged as an error - but it doesn't- and the book renders normally. I also tried the check/repair tools in the calibre editor and they do not report a missing definition either so are undefined css classes generally safe to leave in? [ just in case the definition is there, and I am just going blind, I then deliberately sabotaged the code by changing pcalibre2 to pcalibre3 - which for sure is not defined, and re ran all the checks. Every one passed OK ] I am assuming for now that I must have accidentally deleted the definition somehow, because the alternative - that calibre adds undefined classes - seems very unlikely this is the opposite of having an unused css class. its having an undefined css class is there any tool which will flag up such cases that I can use- either in sigil, or outside of ? will having undefined class(es) crash or confuse some renderers?