CSS Having Error in modalBackground and HeaderFreez

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Following Errors are shown while building Solution, Can anybody tell whats wroung here..

C#

.modalBackground
{
      background-color:ButtonShadow;
      filter:alpha(opacity=70);
      opacity:0.7;
}

MSIL

Error   1   Validation (CSS 2.1): 'filter' is not a known CSS property name.    D:\WebSite1\css\Styles.css    287 4   D:\e-prescription\

C#

.HeaderFreez
{
   /*position:relative ;*/
   position:relative;
   /*top:expression(this.offsetParent.scrollTop);*/
  /* top: expression(this.parentNode.parentNode.parentNode.scrollTop-1);*/
  top: expression(this.parentNode.parentNode.scrollTop-1);
   /*z-index: 10;*/
   z-index:15;
}

MSIL

Error   3   Validation (CSS 2.1): 'expression(this.parentNode.parentNode.scrollTop-1)' is not a valid value for the 'top' property. D:\WebSite1\css\Styles.css    349 8   D:\e-prescription\

Posted 9-Mar-10 0:18am

Minaxi Sajwan

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Rod Kemp · Accepted Answer · 2010-03-09T00:45:00

It actually pretty simple neither filter or expression is valid under CSS as such when you try to build you solution it fails validation under the CSS 2.1 standard.

Specifically filter is IE specific not a part of the CSS standard.

Firefox uses the property opacity:x for transparency, while IE uses filter:alpha(opacity=x).

Tip: The CSS3 syntax for transparency is opacity:x.

The expression value is another IE specific addition that is not valid CSS.