MediaWiki:Citizen.js

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$(function() {
    var header = document.querySelector('.citizen-header');
    var drawer = header.querySelector('.citizen-drawer');
    
    if (header && drawer) {
        var buttonDiv = document.createElement('div');
        buttonDiv.className = 'citizen-header__item';
        
        var link = document.createElement('a');
        link.href = '/index.php/Your_Page';
        link.className = 'citizen-header__button';
        link.title = 'My Custom Button';
        
        // Match Citizen's icon pattern: mw-ui-icon-NAME + mw-ui-icon-wikimedia-NAME
                link.innerHTML = '<span class="citizen-ui-icon mw-ui-icon-add mw-ui-icon-wikimedia-add"></span>';
        
        buttonDiv.appendChild(link);
        header.insertBefore(buttonDiv, drawer);
    }
});