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Bookmark or Share- Page: DOMContentLoaded, load, beforeunload, unloadDOMContentLoaded event – DOM is ready, so the handler can lookup DOM nodes, initialize the interface. load event – external resources are loaded, so styles are applied, image sizes are known 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.
- Difference between DOMContentLoaded and load eventsDOMContentLoaded is a great event to use to hookup UI functionality to complex web pages. From Mozilla Developer Network. The DOMContentLoaded event is fired when the document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading (the load event can be used to detect a fully-loaded page).
- Window: load event - Web APIs | MDN - MDN Web DocsThe load event is fired when the whole page has loaded, including all dependent resources such as stylesheets, scripts, iframes, and images. This is in contrast to DOMContentLoaded, which is fired as soon as the page DOM has been loaded, without waiting for resources to finish loading.. This event is not cancelable and does not bubble.
- Scripts: async, defer - The Modern JavaScript TutorialDOMContentLoaded may happen both before and after async, no guarantees here. A smaller script small.js goes second, but probably loads before long.js, so small.js runs first. Although, it might be that long.js loads first, if cached, then it runs first. In other words, async scripts run in the “load-first” order.
- Document: readystatechange event - Web APIs | MDNThe readystatechange event is fired when the readyState attribute of a document has changed.
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