In our SharePoint 2013 site we have custom theme aware CSS, most of which is working fine across browsers (IE8/9/10, Safari and Firefox) but in case of
/* [ReplaceColor(themeColor:"SelectionBackground")] */ background-color:rgba( 156,206,240,0.5 )
IE8 is not rendering the background style to the style sheet and hence no background color on selection is applied.
Can some one please suggest possible cause/resolution to this issue.
PS - I m new to SharePoint 2013 theme engine.