Initial commit.

assets/scss/lib/fontawesome/_mixins.scss

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+// Mixins
+// --------------------------
+
+@mixin fa-icon($brands: false) {
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    display: inline-block;
+    font-style: normal;
+    font-variant: normal;
+    font-weight: normal;
+    //line-height: 1;
+    //vertical-align: -.125em;
+    font-family: 'Font Awesome 5 Pro';
+    @if $brands {
+        font-family: 'Font Awesome 5 Brands';
+    }
+}
+
+@mixin fa-icon-rotate($degrees, $rotation) {
+    -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation})";
+    @include transform(rotate3d(0, 0, 1, $degrees));
+}
+
+@mixin fa-icon-flip($horiz, $vert, $rotation) {
+    -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation}, mirror=1)";
+    @include transform(scale3d($horiz, $vert, 1));
+}
+
+
+// Only display content to screen readers. A la Bootstrap 4.
+//
+// See: http://a11yproject.com/posts/how-to-hide-content/
+
+@mixin sr-only {
+    border: 0;
+    clip: rect(0, 0, 0, 0);
+    height: 1px;
+    margin: -1px;
+    overflow: hidden;
+    padding: 0;
+    position: absolute;
+    width: 1px;
+}
+
+// Use in conjunction with .sr-only to only display content when it's focused.
+//
+// Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
+//
+// Credit: HTML5 Boilerplate
+
+@mixin sr-only-focusable {
+    &:active,
+    &:focus {
+        clip: auto;
+        height: auto;
+        margin: 0;
+        overflow: visible;
+        position: static;
+        width: auto;
+    }
+}