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HTML size 属性


定义和用法

对于输入元素,size 属性指定 <input> 元素的可见宽度(以字符为单位)。

对于选择元素,size 属性指定下拉列表中可见选项的数量。


应用于

size 属性可用于以下元素

元素 属性
<input> size
<select> size

示例

输入示例

一个包含两个输入字段的 HTML 表单,宽度分别为 35 个字符和 4 个字符

<form action="/action_page.php">
  邮箱: <input type="text" name="email" size="35"><br>
  PIN: <input type="text" name="pin" maxlength="4" size="4"><br>
  <input type="submit" value="提交">
</form>
自己尝试 »

选择示例

一个包含三个可见选项的下拉列表

<select size="3">
  <option value="volvo">沃尔沃</option>
  <option value="saab">萨博</option>
  <option value="opel">欧宝</option>
  <option value="audi">奥迪</option>
</select>
自己尝试 »

浏览器支持

size 属性对每个元素具有以下浏览器支持

元素
input 1.0 2.0 1.0 1.0 1.0
select

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