<optgroup>
<option name="option1"/>
<option name="option2"/>
</optgroup>
| Attributes | ||
| Name | Value | Description |
| title | CDATA | IMPLIED. Text identifier for the element. |
| id | ID | Sets the unique name for the element. |
| class | CDATA | Associates the element with a defined class. |
| xml:lang | NMTOKEN | IMPLIED. Specifies the natural or formal language of an element. |
材料来源 http://www.wirelessdevnet.com/channels/refview.phtml?cat=wmltags 本电子书由gudai制作，仅供学习参考，如有意见，欢迎email：base5@126.com。或访问我的博客http://gudai.cnblogs.com