Regarding the worker pool, what happens when the computer restarts? Does the worker continue where it left off?
Found the answer. Actually workers terminate immediately upon navigating away from the page. This must protect from run away processes taking over the computer.
As a result, as soon as the browser closes on a computer restart, the worker will terminate.
And it will not continue where it left off.
Tip: One must program atomically as to expect if computation can stop at any moment in time.