BrowserScreen.js

// install:
//     npm i puppeteer

// run (assuming this script is save as BrowserScreen.js):
//     node BrowserScreen.js

// the script is saving a screenshot of the website every second to fresh-screenshot.png

const puppeteer = require('puppeteer');


(async () => {

    takeScreenshot = async function () {
        await page.screenshot({ path: "fresh-screenshot.png" , omitBackground: true}); // use your own file name
        console.log("Screenshot image is now fresh");
        setTimeout(takeScreenshot, 1000);
    }


    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto('https://www.unixtimestamp.com/'); // use your own URL

    // // use this if your web page doesn't have transparent background by CSS:
    // await page.evaluate(() => document.body.style.background = 'transparent');

    takeScreenshot();

    // await browser.close(); // this should be called once the script is finished

}) ();