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close events are generated by several APIs:

HTML DOM
Sent to a target <dialog> to let it know that it has been closed.
IndexedDB API
Sent to the IDBDatabase object representing a database connection when the database is unexpectedly closed. This happens after all transactions have been aborted. You can use IDBDatabase.onclose to establish the event handler.
WebRTC API
Sent to an RTCDataChannel to let it know that a data connection has been terminated. You can use the RTCDataConnection.onclose property to establish an event handler for this, in addition to using addEventListener().
WebSocket API
Sent when a WebSocket connection closes. More information needed here.
Web Workers API
Some browsers used a close event to indicate that a given Worker had shut down; this was at one point part of the specification, but has been removed from the spec, and browsers are in the process of removing support for this event in the Web Workers API.

General info

Specification
HTML Living Standard
close

Indexed Database API
close

WebRTC 1.0: Real-time Communication Between Browsers
close
Interface
Event
Bubbles
No
Cancelable
No
Target
HTMLDialogElement, IDBDatabase, RTCDataChannel, or WebSocket
Default Action
None

Properties

Being an Event, this event implements only the properties of this interface.

Methods

Being an Event, this event implements only the methods of this interface.

Specifications

Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browsers
close
Working Draft Definition for the WebRTC API
HTML Living Standard
close
Living Standard Definition regarding the <dialog> element
Indexed Database API 2.0
close
Editor's Draft Definition of the connection closing algorithm and its use of the close event

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Support for the WebRTC event (Yes) 未实现 (Yes) 未实现 (Yes) ?
Support for the WebSockets event (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
Support for the IndexedDB event ? 未实现 50 (50) ? ? ?
Support for the <dialog> event ? 未实现 ? ? ? ?
Support for the Workers event 4 未实现 3.5 (1.9.1) through 50 (50) ? 11.5 4
Feature Android Chrome for Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Support for the WebRTC event ? ? 未实现 ? 未实现 ? ?
Support for the WebSockets event (Yes) (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
Support for the IndexedDB event ? ? 未实现 50.0 (50) ? ? ?
Support for the <dialog> event ? ? 未实现 ? ? ? ?
Support for the Workers event ? 40 未实现 1.0 (1.9.1) through 50.0 (50) ? (Yes) 5.1

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