Specifiying Alternative Media through CSS
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Is it possible to specify @media ? Basically we dont want Header Footers for Web Display sometimes .
Currently we use the Prince Flow ( CSS Running element ) to achieve that . Is that the real purpose of Running Elements ? IMHO another way of solving the same problem instead of changing the flow/position , we can keep a different css style (hidden) for headers and footers for different medias with print being one of them ?

div.header {display:hidden;}

@media print
{
div.header {display:block;
position:running(header)
}
@page {
@top-center {content:element(header);}

}
}

Yes, you can use @media rules, or the media attribute on link elements.