How to check if a document is ready in JavaScript?

Following is the code to check if a document is ready in JavaScript −


 Live Demo

<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   .result {
      font-size: 18px;
      font-weight: 500;
      color: blueviolet;
<h1>Check if a document is ready</h1>
<div class="result"></div>
<button class="Btn">Check</button>
<h3>Click on the above button to see document state</h3>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   resEle.innerHTML = document.readyState + "<br><br>";
   BtnEle.addEventListener("click", () => {
      if (document.readyState === "complete") {
         resEle.innerHTML = "The page has finished loading completely";
      } else {
         resEle.innerHTML = "The page is still loading";


On clicking the ‘Check’ button −