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I get error from CSS validator, that "display" property isn't available for aural media. IMHO it's bug in CSS Validator. According Appendix F of CSS 2.0, is "display" property available for all media types, also in description of aural properties is "display" noted as "speak" property equivalent which could be used in aural CSS: http://www.w3.org/TR/CSS21/aural.html#speaking-props http://www.w3.org/TR/REC-CSS2/aural.html#speaking-props
Fixed, see http://qa-dev.w3.org:8001/css-validator/