+
+ // IE8-9 hack for event handling
+ //
+ // Internet Explorer 8-9 does not support clicks on elements without a set
+ // `background-color`. We cannot use `filter` since that's not viewed as a
+ // background color by the browser. Thus, a hack is needed.
+ //
+ // For IE8, we set solid black as it doesn't support `rgba()`. For IE9, we
+ // set alpha transparency for the best results possible.
+ background-color: #000 \9; // IE8
+ background-color: rgba(0,0,0,0); // IE9