Page: DOMContentLoaded, load, beforeunload, unload

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Thu Feb 03 2022 04:51:20 GMT+0000 (Coordinated Universal Time)

window.addEventListener("beforeunload", (event) => {
  // works, same as returning from window.onbeforeunload
  event.returnValue = "There are unsaved changes. Leave now?";
});

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https://javascript.info/onload-ondomcontentloaded

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How to Save HTML Form Data in JSON - Express

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