WordPress 4.7

[autoinstalls/wordpress.git] / wp-content / themes / twentyseventeen / assets / js / skip-link-focus-fix.js

diff --git a/wp-content/themes/twentyseventeen/assets/js/skip-link-focus-fix.js b/wp-content/themes/twentyseventeen/assets/js/skip-link-focus-fix.js
new file mode 100644 (file)
index 0000000..a40ebac
--- /dev/null
+++ b/wp-content/themes/twentyseventeen/assets/js/skip-link-focus-fix.js
@@ -0,0 +1,31 @@
+/**
+ * File skip-link-focus-fix.js.
+ *
+ * Helps with accessibility for keyboard only users.
+ *
+ * Learn more: https://git.io/vWdr2
+ */
+(function() {
+       var isIe = /(trident|msie)/i.test( navigator.userAgent );
+
+       if ( isIe && document.getElementById && window.addEventListener ) {
+               window.addEventListener( 'hashchange', function() {
+                       var id = location.hash.substring( 1 ),
+                               element;
+
+                       if ( ! ( /^[A-z0-9_-]+$/.test( id ) ) ) {
+                               return;
+                       }
+
+                       element = document.getElementById( id );
+
+                       if ( element ) {
+                               if ( ! ( /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) ) {
+                                       element.tabIndex = -1;
+                               }
+
+                               element.focus();
+                       }
+               }, false );
+       }
+})();