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Showing content from https://webplatform.github.io/docs/dom/BeforeUnloadEvent below:

BeforeUnloadEvent · WebPlatform Docs

Represents the beforeunload event which can be used to take an action (e.g., display a prompt, prevent a navigation from happening) before unloading the current page.

Inherits from EventEvent

returnValue

Gets or sets a value that indicates whether to warn the user prior to navigating away from a page.

No methods.

No events.

bubbles

Gets a value that indicates whether an event propagates up from the event target.

cancelable

Gets a value that indicates whether you can cancel an event’s default action.

currentTarget

Gets the event target that is currently being processed.

defaultPrevented

Gets whether the default action should be canceled.

eventPhase

Gets the event phase that is being evaluated.

isTrusted

Gets a value that indicates whether a trusted event source created an event.

target

Gets the element that is the original target of the event.

timeStamp

Gets the time, in milliseconds, when an event occurred.

type

Gets the name of an event.

initEvent

Initializes a new generic event that the createEvent method created.

preventDefault

Cancels the default action of an event, if possible.

stopImmediatePropagation

Prevents any further propagation of an event.

stopPropagation

Prevents propagation of an event beyond the current target.

DOMContentLoaded
:

afterprint
:

afterupdate
:

beforeactivate
:

beforecopy
:

beforecut
:

beforeeditfocus
:

beforepaste
:

beforeprint
:

beforeunload
:

beforeupdate
:

bounce
:

cellchange
:

change
:

contextmenu
:

controlselect
:

copy
:

cut

Fires after a data selection is cut to the clipboard.

dataavailable

Fires when new data at a data source becomes available.

datasetchanged

Fires when content at a data source has changed.

datasetcomplete

Fires when data transfer from the data source has completed.

deactivate

Sets an active version of an object to not active.

error

Fires when an error occurs.

errorupdate

Executes any error handling associated with the event.

filterchange
:

finish
:

W3C HTML5

Working Draft

WHATWG HTML

Living Standard

• Microsoft Developer Network: [Windows Internet Explorer API reference Article]

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