I think you are misunderstanding how this works. Google isn't "handling" any events at all, your webpage is. Google is instead the source of those events - it i

I think you are misunderstanding how this works. Google isn't "handling" any events at all, your webpage is. Google is instead the source of those events - it is simulating the role of a user. So the bot loads your webpage into a headless browser and sends it a series of events to simulate a user interacting with it, and waits for navigation requests. There is probably a whitelist of simulation behaviors: * mouseover, then click each <a> node * mouseover every pixel * mouseover, then change every <select> node * mouseover, then click every <button> etc... Caveat: though I worked at Google when this work was being done, I was on a different team and don't have any inside knowledge - just speculating on an approach that would make sense.