Timeless.js

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

/* 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 */
$(function() {
	if (mw.config.get('wgMFMode')) {
		function menuFix($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'));
		});
		$('#other-languages h2').on('click', function() {
			menuFix($('#other-languages .sidebar-inner, #menus-cover'));
		});
	}
});

MediaWiki:Timeless.js