MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
$(document).ready(function() {
    var result = 1 + 1;
    var $customItem = $('<li>')
        .attr('id', 'mw-custom-sidebar-calc')
        .text('Result: ' + result);
    $('#p-navigation ul').append(Test);
});