Timeless.js

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/* Any JavaScript here will be loaded for users of the Timeless skin */

/* Collapse boxes on smaller devices */
function mwMobileCollapse($collapsibleContent) {
	if ($(window).width() < 720)
		$.each($collapsibleContent, function (index, element) {
			$(element).data('mw-collapsible').collapse();
		});
}
mw.hook('wikipage.collapsibleContent').add(mwMobileCollapse);

/* Add subpages toolbox link on user pages */
$(function() {
	var title = mw.config.get('wgTitle');
	if (mw.config.get('wgCanonicalNamespace') === 'User' && !title.includes('/')) {
		var subpagesLink = '/Special:PrefixIndex/User:' + title + '/';
		mediaWiki.util.addPortletLink('p-userpagetools', subpagesLink, 'User subpages', 't-subpages', 'Subpages of this page');
	}
});

/* Mobile menu fix */
$(function() {
	function menuFix($element) {
		if ($(window).width() >= 851) {
			if (!$element.attr('style'))
				$element.attr('style', 'display:block !important');
			else
				$element.attr('style', '');
		}
	}
	$('#user-tools h2').on('click', function() {
		menuFix($('#personal-inner, #menus-cover'));
	});
	$('#site-navigation h2').on('click', function() {
		menuFix($('#site-navigation .sidebar-inner, #menus-cover'));
	});
	$('#site-tools h2').on('click', function() {
		menuFix($('#site-tools .sidebar-inner, #menus-cover'));
	});
	$('#page-tools h2').on('click', function() {
		menuFix($('#page-tools .sidebar-inner, #menus-cover'));
	});
});

MediaWiki:Timeless.js