JavaScript File

1/**

2 * File skip-link-focus-fix.js.

3 *

4 * Helps with accessibility for keyboard only users.

5 *

6 * Learn more: https://git.io/vWdr2

7 */

8( function() {

9 var isIe = /(trident|msie)/i.test( navigator.userAgent );

10

11 if ( isIe && document.getElementById && window.addEventListener ) {

12 window.addEventListener( 'hashchange', function() {

13 var id = location.hash.substring( 1 ),

14 element;

15

16 if ( ! ( /^[A-z0-9_-]+$/.test( id ) ) ) {

17 return;

18 }

19

20 element = document.getElementById( id );

21

22 if ( element ) {

23 if ( ! ( /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) ) {

24 element.tabIndex = -1;

25 }

26

27 element.focus();

28 }

29 }, false );

30 }

31} )();