Timeless.js

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/* Any JavaScript here will be loaded for users using 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() {
	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