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onload, readyState, and DOMContentLoaded
<!DOCTYPE html>
window.onload = function () {
console.log(''+(+new Date)+': Onload fired');
document.onreadystatechange = function () {
console.log(''+(+new Date)+': Ready state changed');
if (document.readyState == "complete") {
console.log(''+(+new Date)+': Ready = Complete');
window.addEventListener("DOMContentLoaded", function () {
console.log(''+(+new Date)+': DOM Content Loaded');
<p>To see the difference between <code>onload</code> and <code>readyState == "complete"</code>
and <code>DOMContentLoaded</code>.</p>
<p>Run me with Firebug or Chrome Dev Tools, and cache disabled, and watch the console.</p>
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@jasonwilliams jasonwilliams commented Jun 18, 2015 would be more useful than new Date, and its more accurate

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