A widget has a certain state:
- Active state. This is the default state, where widgets read their values from the request and display them.
- Disabled state, value is displayed but user input is ignored. The widget should be rendered in a manner that indicates that this widget could be active, but is currently not.
- Output state, value is displayed but user input is ignored. The widget should be rendered as plain text, giving no indication that it could be input.
- Invisible state. Values are not displayed and user input is ignored.
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