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NavigationHistoryEntry: dispose event

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The dispose event of the NavigationHistoryEntry interface is fired when the entry is no longer part of the history entry list.

Disposal occurs when:

Forward history entries are cleared. See the example at Notifications on entry disposal for more information.
The user clears their browser history using settings or provided UI controls.
The history limit is exceeded. This is not specified anywhere, but browsers tend to have a history limit of 50 pages.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("dispose", (event) => { })

ondispose = (event) => { }

A generic Event.

navigation.addEventListener("currententrychange", () => {
  navigation.currentEntry.addEventListener("dispose", disposeHandler);
});

Specification
HTML> # handler-navigationhistoryentry-ondispose>

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS
`dispose_event`	102	102	No	88	No	102	No	70	No	19.0	102	No