The HTMLOptGroupElement interface provides special properties and methods (beyond the regular HTMLElement object interface they also have available to them by inheritance) for manipulating the layout and presentation of <optgroup> elements.
Inherits properties from its parent, HTMLElement.
HTMLOptGroupElement.disabledA boolean value representing whether or not the whole list of children <option> is disabled (true) or not (false).
HTMLOptGroupElement.labelA string representing the label for the group.
No specific method; inherits methods from its parent, HTMLElement.
<optgroup>.