Font-Awesome/scss/_mixins.scss

// Mixins
// --------------------------

@mixin fa-icon-rotate($degrees, $rotation) {
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=$rotation);
  -webkit-transform: rotate($degrees);
     -moz-transform: rotate($degrees);
      -ms-transform: rotate($degrees);
       -o-transform: rotate($degrees);
          transform: rotate($degrees);
}

@mixin fa-icon-flip($horiz, $vert, $rotation) {
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=$rotation);
  -webkit-transform: scale($horiz, $vert);
     -moz-transform: scale($horiz, $vert);
      -ms-transform: scale($horiz, $vert);
       -o-transform: scale($horiz, $vert);
          transform: scale($horiz, $vert);
}

@mixin smooth-text() {
  /* CODESIGN2 ADDITIONS */
  text-rendering: optimizeLegibility !important;
  -webkit-font-smoothing: subpixel-antialiased !important;
  text-shadow: 0px 0px 1px rgba(0,0,0,0.004) !important;
}