lifecycleDomEvents.md

[JavaScript] - Lifecycle DOM Events

document.addEventListener('DOMContentLoaded', function (e) {
  console.log('HTML parsed and DOM tree built!', e);
});

window.addEventListener('load', function (e) {
  console.log('Page fully loaded', e);
});

window.addEventListener('beforeunload', function (e) {
  e.preventDefault();
  console.log(e);
  e.returnValue = ''; // only default generic message in modern browser to prevent abuse
});