1. Leave this page open, then switch to another tab, put another window over this one, or minimize the window.
2. Come back after a few minutes.
3. Look at Behind by: how many seconds the countdown lost while you were away. 0 s means the page kept running on time.

Start again

The countdown takes one second off each time the page's one-second timer fires, like the countdown on a sale or payment page, so seconds the page did not get to run stay lost. Made by Embiody, the browser where agents keep working in the background. See BrowserDo.