Moving sass and js files in to the assets directory.

assets/sass/init/visually-hidden/_visually-hidden.scss

@@ -0,0 +1,38 @@
+// sass-lint:disable no-important
+
+// visually-hidden()
+//
+// Make an element visually hidden, but accessible to screen readers, etc.
+// @see http://snook.ca/archives/html_and_css/hiding-content-for-accessibility
+@mixin visually-hidden {
+  position: absolute !important;
+  height: 1px;
+  width: 1px;
+  overflow: hidden;
+  clip: rect(1px, 1px, 1px, 1px);
+  word-wrap: normal;
+}
+
+// visually-hidden--off()
+//
+// Turns off the visually-hidden effect.
+@mixin visually-hidden--off {
+  position: static !important;
+  clip: auto;
+  height: auto;
+  width: auto;
+  overflow: visible;
+}
+
+// visually-hidden--focusable()
+//
+// Makes an element visually hidden by default, but visible when receiving
+// focus.
+@mixin visually-hidden--focusable {
+  @include visually-hidden;
+
+  &:active,
+  &:focus {
+    @include visually-hidden--off;
+  }
+}