DOMContentLoaded, load, beforeunload, unload

Source: https://javascript.info/onload-ondomcontentloaded

The lifecycle of an HTML page has three important events:
  • DOMContentLoaded – the browser fully loaded HTML, and the DOM tree is built, but external resources like pictures <img>and stylesheets may be not yet loaded.
  • load – the browser loaded all resources (images, styles etc).
  • beforeunload/unload – when the user is leaving the page.
Each event may be useful:
  • DOMContentLoaded event – DOM is ready, so the handler can lookup DOM nodes, initialize the interface.
  • load event – additional resources are loaded, we can get image sizes (if not specified in HTML/CSS) etc.
  • beforeunload event – the user is leaving: we can check if the user saved the changes and ask them whether they really want to leave.
  • unload – the user almost left, but we still can initiate some operations, such as sending out statistics.
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