px">Large (16px)</option>
                <option value="18px">Extra Large (18px)</option>
            </select>
        </div>
        <div class="option-group">
            <label>Placeholder:</label>
            <input type="text" id="placeholderInput" value="Start typing markdown...">
        </div>
        <div class="option-group">
            <label>Initial Content:</label>
            <select id="contentSelect">
                <option value="empty">Empty</option>
                <option value="samp