How to take screenshots at different points in a page load with Puppeteer?

To take screenshots at different points in a page load with Puppeteer, you can use the page.waitFor method to wait for specific conditions or elements to appear on the page before taking the screenshot. Here is an example of how to take screenshots at different points in a page load using Puppeteer:

First, install Puppeteer by running the following command in your terminal:

npm install puppeteer

Write a script that uses Puppeteer to take screenshots at different points in a page load. Here is an example script that takes a screenshot when the page is first loaded and then waits for a specific element to appear before taking another screenshot:

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();

  // Take a screenshot when the page is first loaded
  await page.goto('https://www.example.com');
  await page.screenshot({ path: 'screenshot1.png' });

  // Wait for a specific element to appear
  await page.waitForSelector('.element-to-wait-for');

  // Take a screenshot after the element appears
  await page.screenshot({ path: 'screenshot2.png' });

  await browser.close();
})();

Save the script to a file, for example screenshots.js, and run it using Node.js:

node screenshots.js

This script will take a screenshot when the page is first loaded and then wait for a specific element with the class element-to-wait-for to appear before taking another screenshot. You can modify the script to wait for different conditions or elements as needed.