Font-Awesome/src/assets/font-awesome/scss/_extras.scss

---
---
/* EXTRAS
 * -------------------------- */

/* Stacked and layered icon */
@include {{ site.fontawesome.css_prefix }}-stack();

/* Animated rotating icon */
.{{ site.fontawesome.css_prefix }}-spin {
  -webkit-animation: spin 2s infinite linear;
  -moz-animation: spin 2s infinite linear;
  -o-animation: spin 2s infinite linear;
  animation: spin 2s infinite linear;
}

@-moz-keyframes spin {
  0% { -moz-transform: rotate(0deg); }
  100% { -moz-transform: rotate(359deg); }
}
@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(359deg); }
}
@-o-keyframes spin {
  0% { -o-transform: rotate(0deg); }
  100% { -o-transform: rotate(359deg); }
}
@-ms-keyframes spin {
  0% { -ms-transform: rotate(0deg); }
  100% { -ms-transform: rotate(359deg); }
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(359deg); }
}


// Icon rotations & flipping
// -------------------------

.{{ site.fontawesome.css_prefix }}-rotate-90  { @include {{ site.fontawesome.css_prefix }}-rotate(90deg, 1);  }
.{{ site.fontawesome.css_prefix }}-rotate-180 { @include {{ site.fontawesome.css_prefix }}-rotate(180deg, 2); }
.{{ site.fontawesome.css_prefix }}-rotate-270 { @include {{ site.fontawesome.css_prefix }}-rotate(270deg, 3); }

.{{ site.fontawesome.css_prefix }}-flip-horizontal { @include {{ site.fontawesome.css_prefix }}-flip(-1, 1); }
.{{ site.fontawesome.css_prefix }}-flip-vertical   { @include {{ site.fontawesome.css_prefix }}-flip(1, -1); }