Quote:
Originally Posted by JSWolf
And when you up the CSS level, you also validate for things that aren't valid in ePub 2.
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The problem with CSS is that everything is valid. As long as the syntax is correct, you can add any property you like and it doesn't make it invalid. It may work as expected, or it may be ignored, but it shouldn't harm.
If a CSS validator for epub was to be designed, it could issue warnings for properties or values not specified as required in the spec, or known to be poorly implemented in some readers, but no errors.