How does fiverr detect if I am active or not?

[faisaltushar]

My question is I can't always just refresh my gig and look after it as it gets tiresome after some time. So, how does fiverr actually detects whether I am active or not? I mean what is the algorithm or what is the requirement? Do they track my mouse movement or keystrokes? Or does just refreshing the tab also counts as being active on the platform itself?