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The **`value`** attribute _MUST_ return the last value from which it was set. The value is updated by the [monitor the list of available presentation displays](https://www.w3.org/TR/presentation-api/#dfn-monitor-the-list-of-available-presentation-displays) algorithm.
The `onchange` attribute is an [event handler](https://www.w3.org/TR/presentation-api/#dfn-event-handler) whose corresponding [event handler event type](https://www.w3.org/TR/presentation-api/#dfn-event-handler-event-type) is `change`.