MediaWiki:Citizen.js

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/* All JavaScript here will be loaded for users of the Citizen skin */
if (mw.config.get('wgTitle') === 'Main_Page') {
    // Hide the sidebar with class 'citizen-page-sidebar'
    var sidebar = document.querySelector('.citizen-page-sidebar');
    if (sidebar) {
        sidebar.style.display = 'none';
    }
}