setOffline(offline)

import { chromium } from 'k6/experimental/browser';

export default async function () {
  const browser = chromium.launch();
  const context = browser.newContext();

  context.setOffline(true);

  const page = context.newPage();

  try {
    await page
      .goto('https://test.k6.io/browser.php', { 
        // Will not be able to load the page
        waitUntil: 'networkidle' 
    });
  } finally {
    page.close();
    browser.close();
  }
}