NavigationHistoryEntry: dispose event

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.

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

ondispose = (event) => {};

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