https://vallummag.com/wp-content/themes/blogic/js/navigation.js?ver=1790855909

1/**
2 * navigation.js
3 *
4 * Handles toggling the navigation menu for small screens and enables tab
5 * support for dropdown menus.
6 */
7( function() {
8	var nav = document.getElementById( 'site-navigation' ), button, menu;
9	if ( ! nav ) {
10		return;
11	}
12
13	button = nav.getElementsByTagName( 'button' )[0];
14	menu   = nav.getElementsByTagName( 'ul' )[0];
15	if ( ! button ) {
16		return;
17	}
18
19	// Hide button if menu is missing or empty.
20	if ( ! menu || ! menu.childNodes.length ) {
21		button.style.display = 'none';
22		return;
23	}
24
25	button.onclick = function() {
26		if ( -1 === menu.className.indexOf( 'nav-menu' ) ) {
27			menu.className = 'nav-menu';
28		}
29
30		if ( -1 !== button.className.indexOf( 'toggled-on' ) ) {
31			button.className = button.className.replace( ' toggled-on', '' );
32			menu.className = menu.className.replace( ' toggled-on', '' );
33		} else {
34			button.className += ' toggled-on';
35			menu.className += ' toggled-on';
36		}
37	};
38} )(jQuery);