TAG:  optgroup
<optgroup> ... </optgroup>
Available in versions: 4.0
Browser compatibility: Netscape 6
 
The <optgroup> tag is used to group together related items in a pull-down form control. An item can only be added to the group by using the option tag. Both the optgroup and option tags must be used inside the opening and closing select tags.
 
It is expected that future versions of HTML may allow this tag to create nested pull-down lists.
 
This tag is currently very poorly supported by browsers.
 
The closing tag is mandatory.
 
Core Attributes
 
class    dir    id    lang    onclick    ondblclick    onkeydown    onkeypress    onkeyup    onmousedown    onmousemove    onmouseout    onmouseover    onmouseup    style    title
 
Attributes
 
disabled
The disabled attribute is used to disable the caption group. The only permitted value is disabled.
 
label
The label attribute is used to specify a short caption.
 
Code:
<select>
<optgroup label="Mexican tropical fish">
<option>Molly</option>
<option>Platy</option>
<option>Sword Tail</option>
</optgroup>
<optgroup label="Goldfish">
<option>Comet</option>
<option>Common</option>
<option>Sarasa</option>
</optgroup>
</select>
 
Output:

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