How can I emulate different network conditions (e.g., slow 3G) in Puppeteer?
Alex K

1. What is the Puppeteer API method to close a browser tab? To close a browser tab in Puppeteer, you can use thepage.close() method. Here's a detailed explanation:

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const puppeteer = require('puppeteer');

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

  // Perform actions with the page here

  await page.close(); // Close the current browser tab

  // Close the browser
  await browser.close();
})();

In this code snippet, after creating a new page usingbrowser.newPage(), thepage.close() method is called to close the current browser tab. This will close the tab associated with thepage object. 2. How can I emulate different network conditions (e.g., slow 3G) in Puppeteer? To emulate different network conditions, such as slow 3G or offline mode, you can use thepage.emulateNetworkConditions() method. Here's how you can do it:

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const puppeteer = require('puppeteer');

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

  await page.emulateNetworkConditions({
    offline: false, // Set to true to emulate offline mode
    downloadThroughput: 1.6 * 1024 * 1024 / 8, // Set the download speed (e.g., 1.6 Mbps)
    uploadThroughput: 750 * 1024 / 8, // Set the upload speed (e.g., 750 Kbps)
    latency: 40 // Set the network latency (e.g., 40 ms)
  });

  // Perform actions with the page here

  // Close the browser
  await browser.close();
})();

In this example,page.emulateNetworkConditions() is called to emulate specific network conditions. You can adjust the parameters based on your requirements: -offline: Set totrue to emulate offline mode. -downloadThroughput: Specifies the download speed in bytes per second. The example sets it to 1.6 Mbps. -uploadThroughput: Specifies the upload speed in bytes per second. The example sets it to 750 Kbps. -latency: Specifies the network latency in milliseconds. The example sets it to 40 ms. By setting these options, you can simulate different network conditions in Puppeteer, allowing you to test the performance and behavior of your web application under various network scenarios.

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