js on document load does not execute on cache code example

Example 1: javascript empty cache and hard reload

window.history.forward(1);

Example 2: JS how to determine if page was cached

// https://developer.mozilla.org/en-US/docs/Web/API/PageTransitionEvent
window.addEventListener('pageshow', myFunction);

function myFunction(event) { 
  if (event.persisted) {
    alert("The page was cached by the browser");
  } else {
    alert("The page was NOT cached by the browser");
  }
}