jQuery Document Ready (edit)

https://www.sitepoint.com/jquery-document-ready-plain-javascript/

All browsers

window.addEventListener('DOMContentLoaded', (event) => {
    console.log('DOM fully loaded and parsed');
});

document.addEventListener('DOMContentLoaded', function(event) {
    // Handler the event occurred
});

document.addEventListener("DOMContentLoaded", function() {
    // Handler when the DOM is fully loaded
});

$(document).ready(function() {
    // Handler for .ready() called.
});

$(window).on("load", function() {
    // Handler when all assets (including images) are loaded
});

$(function() {
    // Handler when all assets (including images) are loaded
});

Older versions of Internet Explorer

document.attachEvent("onreadystatechange", function() {
 // check if the DOM is fully loaded
 if(document.readyState === "complete") {
 // remove the listener, to make sure it isn't fired in future
 document.detachEvent("onreadystatechange", arguments.callee);
 // The actual handler...
 }
});