E2e testing Selenium vs Headless Chrome - who's done?

Question

Software testing

I got interested in e2e testing, I don’t swim much in this topic) There were questions:
1) do I understand correctly that Selenium is a cross-browser engine, with related features - such as testing in ie, chrome, ff, etc...
2) on How long can a Puppeteer (with headless chrome) replace Selenium? considering that it is only for chrome
3) it turns out that if you want to be in trend, you need to switch to Pappett - in order to do general tests, and cross-browser - do it on Selenium for now?

Answer 1

Java1.7 + selenium + thucydides => I haven't seen anything better than this for UI tests.

Answer 2

Selenium interacts with the browser through the appropriate webdriver (its own for IE, Chrome, FF, etc.). It's not "cross-browser" in the sense that you can't just run tests in all browsers at the same time. It is necessary to initialize the driver of the corresponding browser, then the tests will be executed from under this browser.
I had no experience with Puppeteer. I can't say anything about him.