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OPTGROUP in FORM ELEMENTS of HTML 4
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Usage 
Optgroup tag is used to group list of items in drop down.
Disabled attribute is used to disable specific group of item.
The label attribute is used to specifies a label for an option-group.
Example
<html>
<body>


<select>
  <optgroup label="Veg">
    <option value="carrot">carrot</option>
    <option value="Peas">Peas</option>
  </optgroup>
  <optgroup label="non veg" disabled>
    <option value="Chicken">chicken</option>
    <option value="mutton">mutton</option>
  </optgroup>
</select>

</html>
</body>
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