puppeteer/docs/guides/screenshots.md

Screenshots

For capturing screenshots use Page.screenshot().

const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://news.ycombinator.com', {
  waitUntil: 'networkidle2',
});
await page.screenshot({
  path: 'hn.pdf',
});

await browser.close();

You can also capture a screenshot of a specific element using ElementHandle.screenshot():

const fileElement = await page.waitForSelector('div');
await fileElement.screenshot({
  path: 'div.png',
});

By default, ElementHandle.screenshot() tries to scroll the element into view if it is hidden.