Puppeteer: How to handle multiple tabs?

Question

Scenario: Web form for developer app registration with two part workflow.

Page 1: Fill out developer app details and click on button to create Application ID, which

Answer 1

This will work for you in the latest alpha branch:

const newPagePromise = new Promise(x => browser.once('targetcreated', target => x(target.page())));
await page.click('my-link');
// handle Page 2: you can access new page DOM through newPage object
const newPage = await newPagePromise;
await newPage.waitForSelector('#appid');
const appidHandle = await page.$('#appid');
const appID = await page.evaluate(element=> element.innerHTML, appidHandle );
newPage.close()
[...]
//back to page 1 interactions

Be sure to use the last puppeteer version (from Github master branch) by setting package.json dependency to

"dependencies": {
    "puppeteer": "git://github.com/GoogleChrome/puppeteer"
},

Source: JoelEinbinder @ https://github.com/GoogleChrome/puppeteer/issues/386#issuecomment-343059315