<h2>标签</h2> <form> <label for="name">Input <input type="text" placeholder="Name" id="name"> </label> <label for="address">Textarea <textarea rows="4" placeholder="Address" id="address"></textarea> </label> <label for="num">Select <select id="num"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select> </label> </form>