internet explorer 8 - CSS3 valid 'opacity' for <=IE8 -


I am trying to ensure that my company website HTML5 / CSS3 is legitimate, but I have a small problem Piece of CSS

Actually, we have a filtered list of team members (a picture below each of their names / emails), which are out of the scope of the end and a little faded ( opacity) : 0.3; ). However, with IE8 (and earlier) being special, I used the following - 

  Filters: alpha (opacity = 30);

although this is a verification error "error error opacity = 30 parse"), so I searched and changed it with - 

  -ms - Filters: "Prozed: Dximage Transforms. Microsoft. Alpha (Opacity = 30)"; There is no error at this time, but I got a warning - "Property-M-filter is an unknown vendor extension"  
 Does anyone have a valid code of CSS3 valid? Does the know-how to implement  Opacity  which is compatible with IE8 backwards (i.e. any errors or warnings)? Thank you.

One way would be to add an additional effect with ambiguity in browsers like this, which Opacity does not present the property, they are still able to differentiate the members of the team which are outside the field: 

  Selector {Background: #DFDFDF; / * New property, light brown background * / opacity: 0.3; / * Old existing property, no verification alert * /}

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