Remove -ms-keyframes

css/font-awesome.css

@@ -107,14 +107,6 @@
     -o-transform: rotate(359deg);
   }
 }
-@-ms-keyframes spin {
-  0% {
-    -ms-transform: rotate(0deg);
-  }
-  100% {
-    -ms-transform: rotate(359deg);
-  }
-}
 @keyframes spin {
   0% {
     transform: rotate(0deg);

less/spinning.less

@@ -20,10 +20,6 @@
   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); }

scss/_mixins.scss

@@ -2,7 +2,7 @@
 // --------------------------
 
 @mixin fa-icon-rotate($degrees, $rotation) {
-  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=$rotation);
+  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation});
   -webkit-transform: rotate($degrees);
      -moz-transform: rotate($degrees);
       -ms-transform: rotate($degrees);
@@ -11,7 +11,7 @@
 }
 
 @mixin fa-icon-flip($horiz, $vert, $rotation) {
-  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=$rotation);
+  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation});
   -webkit-transform: scale($horiz, $vert);
      -moz-transform: scale($horiz, $vert);
       -ms-transform: scale($horiz, $vert);

scss/_spinning.scss

@@ -20,10 +20,6 @@
   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); }

src/assets/font-awesome/less/spinning.less

@@ -23,10 +23,6 @@
   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); }

src/assets/font-awesome/scss/_spinning.scss

@@ -23,10 +23,6 @@
   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); }