Simple online clock that can work as a stopwatch or countdown timer with start, pause and reset functions.

Total and alert times and count direction can be changed using query params, e.g.

https://szimek.github.io/final-countdown/?time=60&alert=30
https://szimek.github.io/final-countdown/?time=10&alert=5&direction=up

• click - start or pause timer
• double click - reset timer

The defaults are:

total time: 1200 seconds (20 minutes)
alert time:  180 seconds (3 minutes)
direction:  down

Uses RxJS, because why not.