HTML <optgroup> tag
Usage
Defines a group of options within a form.
Example
Code:
<select>
<optgroup label="Animals">
<option value="cat">Cat</option>
<option value="dog">Dog</option>
<option value="hamster">Hamster</option>
</optgroup>
</select>Output:
Required Attributes
- label - gives the option group a label
Optional Attributes
- disabled - disables the entire group by default