https://petsonlypets.com/wp-content/themes/bam/assets/js/skip-link-focus-fix.js?ver=20151215

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} )();