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   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  })();