Timeless.js

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

/* 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