🏠 New in High Baseline Support: Beforeunload

January 29, 2018

caniuse · mdn · spec

The beforeunload event is fired when the current window is about to be unloaded. Typically this is used to display a dialog to confirm if users really want to leave the page when there is unsaved data that would be lost.

Source features

• api.Window.beforeunload_event [mdn]
• api.BeforeUnloadEvent [mdn]
• api.BeforeUnloadEvent.user_interaction [mdn]
• api.Window.beforeunload_event.preventdefault_activation [mdn]