From 72eabbc6373eb659f33db6dc360a0517d18efd16 Mon Sep 17 00:00:00 2001
From: Dave Gandy <dave@davegandy.com>
Date: Tue, 5 Apr 2016 15:53:24 -0500
Subject: adding a11y-focused sr-only and sr-only-focusable utilities

---
 less/mixins.less | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'less/mixins.less')

diff --git a/less/mixins.less b/less/mixins.less
index 9ee27b7f3..3aca89f55 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -24,3 +24,37 @@
       -ms-transform: scale(@horiz, @vert);
           transform: scale(@horiz, @vert);
 }
+
+
+// Only display content to screen readers. À la Bootstrap 4.
+//
+// See: http://a11yproject.com/posts/how-to-hide-content/
+
+.sr-only() {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0,0,0,0);
+  border: 0;
+}
+
+// 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
+
+.sr-only-focusable() {
+  &:active,
+  &:focus {
+    position: static;
+    width: auto;
+    height: auto;
+    margin: 0;
+    overflow: visible;
+    clip: auto;
+  }
+}
-- 
cgit v1.2.3