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Capricorn · 03-07-2016, 05:07 AM

Hi,

Most of the time I validate all stylesheets with the W3C Validator (right-click on the stylesheet and select in the menu "validate with W3C").

Sometimes I get messages like:
doesn't exist in CSS level 2.1 but exists in [css3] :

This happens for example with CSS elements like text-wrap or background-size...etc.

I have a tendency to simply remove such entries as they never seem to impact anything, at least in my experience.

However, if I leave them there, would that cause problems?

And if one day epub 3 takes the upper hand, would that be detrimental to those files. I understand epub 3 uses CSS3 but epub 2 uses CSS2.1.
My knowledge of CSS is limited. Enough to get by and have epubs to my liking.

Just trying to improve my understanding.

03-07-2016, 05:07 AM	#1
Capricorn Belgian Pommes Frites Posts: 122 Karma: 35038 Join Date: Jan 2012 Device: Pocketbook Touch HD	validate with W3C Validator question Hi, Most of the time I validate all stylesheets with the W3C Validator (right-click on the stylesheet and select in the menu "validate with W3C"). Sometimes I get messages like: doesn't exist in CSS level 2.1 but exists in [css3] : This happens for example with CSS elements like text-wrap or background-size...etc. I have a tendency to simply remove such entries as they never seem to impact anything, at least in my experience. However, if I leave them there, would that cause problems? And if one day epub 3 takes the upper hand, would that be detrimental to those files. I understand epub 3 uses CSS3 but epub 2 uses CSS2.1. My knowledge of CSS is limited. Enough to get by and have epubs to my liking. Just trying to improve my understanding.