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/wp-content/themes/twentyfifteen/js/ -> skip-link-focus-fix.js (source)

   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  } )();


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