[Question] How does Playwright communicate with browsers?

[suryagh]

I understand Playwright does not use Selenium. So, does Playwright use DevTools protocol to interact with browsers? I could not find much detail on how cross-browser is accomplished.

Is it DevTools? (+ something else too / browser-by-browser basis?) Any thoughts or comment is highly appreciated (Please feel free to point me to and doc/write-up, if there is one)

Thank you!

[JoelEinbinder]

We use the DevTools Protocol to communicate with Chromium. For Firefox and WebKit, we implemented on our own protocols similar to the chrome one. You can find these in the browser_patches folder.