Example
A disabled option-group:
<select>
<optgroup label="German Cars" disabled>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</optgroup>
</select>
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Definition and Usage
The disabled attribute is a boolean attribute.
When present, it specifies that an option-group should be disabled.
A disabled option-group is unusable and un-clickable.
The disabled attribute can be set to keep a user from selecting the option-group until some other condition has been met (like selecting a checkbox, etc.). Then, a JavaScript is required to remove the disabled value, and make the option-group selectable.
Browser Support
The numbers in the table specify the first browser version that fully supports the attribute.
| Attribute | |||||
|---|---|---|---|---|---|
| disabled | 1.0 | 8.0 | Yes | Yes | Yes |
Differences Between HTML 4.01 and HTML5
NONE.
Differences Between HTML and XHTML
In XHTML, attribute minimization is forbidden, and the disabled attribute must be defined as <optgroup disabled="disabled">.
Syntax
<optgroup disabled>