Launch countdown timer main project

That I added several bonus features. I added the flip, although it's really a pseudo flip. I added two buttons, one to pause/continue the timer, and one to add sound (though the sound can never align correctly using a button). My timer will also work for other values (can be changed in the onload method). I tested it for NaN , infinity, and negative numbers, my code will just return all zeros and stop , instead of crashing.

With every project there's always challenges, so many that I just barely remember them. I got lucky with this project that it went pretty smoothly.