[simon_acca]

Cannot upvote this enough!

The URL feature would be really useful, especially if you put the UNIX epoch time in the url. This way you can send the timer to other people/devices, and you can also close the tab by mistake and have the countdown pick up exactly where it should.

[simon_acca]

I wanted this for a long time and ended up implementing it (proof of concept, not guarantees): https://epoch-timer.gomix.me/

Feel free to "remix" it: https://gomix.com/#!/project/epoch-timer