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Reported by Peter Moulder 8.4 (Padding properties) says: # Unlike margin properties, values for padding values cannot be # negative. [...] 8.5.1 (Border width) says: # The border width properties specify the width of the border area. # The properties defined in this section refer to the <border-width> # value type, which may take one of the following values: # # [...] # <length> # The border's thickness has an explicit value. Explicit border # widths cannot be negative. It's not clear what an implementation should do when it encounters a specified negative value. Conversation begins: Bug description: http://lists.w3.org/Archives/Public/www-style/2011Jan/0107
Peter proposes in http://lists.w3.org/Archives/Public/www-style/2011Jan/0107 to make negative lengths illegal for the padding and border width properties, linking to syndata.html#illegalvalues