/**
 * File skip-link-focus-fix.js.
 *
 * Helps with accessibility for keyboard only users.
 *
 * This is the source file for what is minified in the twentytwenty_skip_link_focus_fix() PHP function.
 *
 * Learn more: https://git.io/vWdr2
 *
 * @since Twenty Twenty 1.0
 */
( function() {
var isIe = /(trident|msie)/i.test( navigator.userAgent );

if ( isIe && document.getElementById && window.addEventListener ) {
window.addEventListener( 'hashchange', function() {
var id = location.hash.substring( 1 ),
element;

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

element = document.getElementById( id );

if ( element ) {
if ( ! ( /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) ) {
element.tabIndex = -1;
}

element.focus();
}
}, false );
}
}() );