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DOMContentLoaded vs load

Written byPhuoc Nguyen
25 Jun, 2020


The `DOMContentLoaded` event fires when all the nodes in the page have been constructed in the DOM tree. The `load` event fires when all resources such as images and sub-frames are loaded completely.

Good to know

The `DOMContentLoaded` event isn't supported in IE 8 and the older versions of IE.
To support the behavior in the old versions of IE, we can use the `readyState` property to check if the document is loaded completely or not:
const ready = function (cb) {
document.readyState === 'loading'
? // The document is still loading
document.addEventListener('DOMContentLoaded', function (e) {
: // The document is loaded completely
The `ready` function accepts a function that will be invoked when the document is ready:
ready(function() {
// Do something when the document is ready
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