wp-content/themes/twentyfifteen/js/skip-link-focus-fix.js

   1 /**
   2  * Makes "skip to content" link work correctly in IE9, Chrome, and Opera
   3  * for better accessibility.
   4  *
   5  * @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/
   6  */
   7
   8 ( function() {
   9         var ua = navigator.userAgent.toLowerCase();
  10
  11         if ( ( ua.indexOf( 'webkit' ) > -1 || ua.indexOf( 'opera' ) > -1 || ua.indexOf( 'msie' ) > -1 ) &&
  12                 document.getElementById && window.addEventListener ) {
  13
  14                 window.addEventListener( 'hashchange', function() {
  15                         var element = document.getElementById( location.hash.substring( 1 ) );
  16
  17                         if ( element ) {
  18                                 if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.nodeName ) ) {
  19                                         element.tabIndex = -1;
  20                                 }
  21
  22                                 element.focus();
  23                         }
  24                 }, false );
  25         }
  26 } )();