disabled

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disabled
Type: boolean
Indicates whether the element is disabled or not. If this element is set to true the element is disabled. Disabled elements are usually drawn with grayed-out text. If the element is disabled, it does not respond to user actions, it cannot be focused, and the command event will not fire.
The element will, however, still respond to mouse events. To enable the element, leave this attribute out entirely as opposed to setting the value to false.

 

Image:XUL_ref_attr_disabled.png
<!-- Checkbox enables/disables the button -->
<checkbox label="Enable button" 
    onclick="document.getElementById('buttRemove').disabled = this.checked"/>
<button id="buttRemove" label="Remove All" disabled="true"/>

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