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   1  // Mixins
   2  // --------------------------
   3  
   4  @mixin fa-icon {
   5    -webkit-font-smoothing: antialiased;
   6    -moz-osx-font-smoothing: grayscale;
   7    display: inline-block;
   8    font-style: normal;
   9    font-variant: normal;
  10    font-weight: normal;
  11    line-height: 1;
  12  }
  13  
  14  @mixin fa-icon-rotate($degrees, $rotation) {
  15    -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation})";
  16    transform: rotate($degrees);
  17  }
  18  
  19  @mixin fa-icon-flip($horiz, $vert, $rotation) {
  20    -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation}, mirror=1)";
  21    transform: scale($horiz, $vert);
  22  }
  23  
  24  
  25  // Only display content to screen readers. A la Bootstrap 4.
  26  //
  27  // See: http://a11yproject.com/posts/how-to-hide-content/
  28  
  29  @mixin sr-only {
  30    border: 0;
  31    clip: rect(0, 0, 0, 0);
  32    height: 1px;
  33    margin: -1px;
  34    overflow: hidden;
  35    padding: 0;
  36    position: absolute;
  37    width: 1px;
  38  }
  39  
  40  // Use in conjunction with .sr-only to only display content when it's focused.
  41  //
  42  // Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
  43  //
  44  // Credit: HTML5 Boilerplate
  45  
  46  @mixin sr-only-focusable {
  47    &:active,
  48    &:focus {
  49      clip: auto;
  50      height: auto;
  51      margin: 0;
  52      overflow: visible;
  53      position: static;
  54      width: auto;
  55    }
  56  }