I got is adding media="print" property to the CSS references.

In this below script,Print css in javascript

I got is adding media="print" property to the CSS references.

/* This CSS removes the header, navigation and other action elements from the print preview  */

1. 

<style>

     @media print{

     #suiteBar{display:none;}

          #titleAreaBox{display:none;}

          #pageTitle{display:none;}

#btnPrint{display:none;}

     }

     </style>

/* Insert your print stylsheet here */

}

2. 

 /* Reference master page  */ 

<link rel="stylesheet" media="print" href="print.css" type="text/css"/>