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Old 12-05-2012, 06:14 PM   #1
kamanza
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CSS validation error
Converting books to epub in Calibre produces 2 CSS files, one of which (page_styles) doesn't pass CSS 3 validation:

Quote:
URI : TextArea
2 Value Error : margin-bottom Parse Error [empty string]
3 Value Error : margin-top Parse Error [empty string]


Warnings (1)
URI : TextArea
4 No declarations in the rule


Valid CSS information
@page {
}
How should page margins be defined in order to comply with CSS 3 specifications?
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Old 12-05-2012, 09:36 PM   #2
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Quote:
Originally Posted by kamanza View Post
Converting books to epub in Calibre produces 2 CSS files, one of which (page_styles) doesn't pass CSS 3 validation:



How should page margins be defined in order to comply with CSS 3 specifications?
margin-right: 0; is valid
margin-left: ; is not
If you don't want/need to specify any, remove the words (or comment out)
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Old 12-06-2012, 12:26 AM   #3
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Apparently I wasn't clear about the contents of the Calibre-generated page_styles.css:

Code:
@page {
	margin-bottom:5pt;
	margin-top:5pt
	}
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Old 12-06-2012, 12:39 AM   #4
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http://www.w3.org/TR/css3-page/#margin-boxes
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Old 12-06-2012, 01:30 AM   #5
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According to everything I read on www.w3.org, the above Calibre .css should be all right. Could it be a bug in the validation service?
page_styles.css works OK in ADE.
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Old 12-06-2012, 03:05 AM   #6
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Which validator are you using? I use http://validator.idpf.org/ and this does not report any errors with calibre's page_styles.css.
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Old 12-06-2012, 06:48 AM   #7
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I use the CSS validation tool in Sigil, which redirects to W3C validation service.
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Old 12-06-2012, 04:24 PM   #8
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When I submit page_styles.css to W3C I get a different message to the one you get. It says that margin-top and margin-bottom do not exist in CSS3 (but do in CSS1 and CSS2). You can use the "More Options" button in the W3C validator to select CSS2 instead.

Can Sigil be configured to use a different validator? The IDPF tool is specifically for ePub 2 and 3 documents whereas the W3C tool is for CSS in general.
Last edited by Agama; 12-06-2012 at 04:31 PM.
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Old 12-07-2012, 07:48 PM   #9
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But if you check the CSS 3 reference page on W3schools
http://www.w3schools.com/cssref/default.asp, you'll find all the usual margin properties.
Could it be that CSS 3 doesn't allow margins for paged media?
Very strange.
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Old 12-07-2012, 11:07 PM   #10
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CSS 3 has a completely different specification for page margins, see the link I posted before.
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Old 12-08-2012, 09:22 AM   #11
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Agreed, the CSS3 margin spec is quite different.

@kamanza:

CSS3 does support paged media and @page, but regarding ePub 2 & 3, the IDPF documentation says:

Quote:
EPUB 3 defines a profile of CSS based on CSS 2.1 with added modules from CSS3, whereas EPUB 2 was based on a specific subset of CSS 2.
So it looks like ePub3 does not support all of CSS3. Therefore an ePub2/ePub3 validator looks more appropriate than a CSS validator. Alternatively you could use the option button on the W3C validator to use CSS 2.1.

Conclusion: Calibre's style sheets are fully compliant with the ePub specification.
Last edited by Agama; 12-08-2012 at 09:27 AM.
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Old 12-12-2012, 02:21 AM   #12
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Thanks for the explanation. Seems, the question has to be transferred to the Sigil forum:
the wrong CSS validator.
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