Selenium works by running the html/code through a javascript enabled browser.

Your question seems to be: is it possible to emulate a javascript-enabled browser in 100% pure perl, then the answer is yes.

The catch is that no-one has written anything even close to doing that. Even given working HTTP/WWW and JavaScript libraries it's very far from trivial to cook up a working/scriptable DOM model that can be used from the JavaScript code and is compatible with most current websites, or even a small subset of most websites. And I've tried. :-)