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Editing: skip-link-focus-fix.js

/**
 * File skip-link-focus-fix.js
 *
 * Helps with accessibility for keyboard only users.
 * This is the source file for what is minified in the astra_skip_link_focus_fix() PHP function.
 *
 * Learn more: https://github.com/Automattic/_s/pull/136
 *
 * @package Astra
 */

( function() {
	var is_webkit = navigator.userAgent.toLowerCase().indexOf( 'webkit' ) > -1,
	    is_opera  = navigator.userAgent.toLowerCase().indexOf( 'opera' ) > -1,
	    is_ie     = navigator.userAgent.toLowerCase().indexOf( 'msie' ) > -1;

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

if ( ! ( /^[a-zA-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 );
	}
})();