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<!DOCTYPE html> <html> <body> <h1>select autofocus 属性</h1> <p>autofocus 属性指定下拉列表应在页面加载时自动获得焦点：</p> <form action="/action_page.php"> <label for="cars">选择一辆车：</label> <select name="cars" id="cars" autofocus> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="opel">Opel</option> <option value="audi">Audi</option> </select> <br><br> <input type="submit" value="提交"> </form> <p><strong>注意：</strong> select 标签的 autofocus 属性在 Firefox 中不受支持。</p> </body> </html>