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" style="display:flex;align-items:center;justify-content:center;"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor"><path d="M15.5 3H11l-1-1H4.5A1.5 1.5 0 003 3.5v13A1.5 1.5 0 004.5 18h11a1.5 1.5 0 001.5-1.5V4.5A1.5 1.5 0 0015.5 3zM14 11h-3v3H9v-3H6V9h3V6h2v3h3v2z"/></svg></span>';

        
        buttonDiv.appendChild(link);
        header.insertBefore(buttonDiv, drawer);
    }
});