---
title: PresentationAvailability.value
slug: Web/API/PresentationAvailability/value
browser-compat: api.PresentationAvailability.value
---
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`_.

## Browser compatibility

{{Compat}}
