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

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/**
* Makes "skip to content" link work correctly in IE9, Chrome, and Opera
* for better accessibility.
*
* @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/
*/
( function() {
var ua = navigator.userAgent.toLowerCase();
if ( ( ua.indexOf( 'webkit' ) > -1 || ua.indexOf( 'opera' ) > -1 || ua.indexOf( 'msie' ) > -1 ) &&
document.getElementById && window.addEventListener ) {
window.addEventListener( 'hashchange', function() {
var element = document.getElementById( location.hash.substring( 1 ) );
if ( element ) {
if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.nodeName ) ) {
element.tabIndex = -1;
}
element.focus();
}
}, false );
}
} )();