Features:

- Picture-In-Picture mode to always show the timer on top of the desktop.

- Airplay the timer to a TV / Secondary screen.

- Off-line capable through the use of a Service Worker.

- Extremely small codebase (3.3kB, no minification).

- Zero dependencies (not even Node / NPM)

- Zero build time.

I had a nice idea how to 'use the platform' for a timer. It basically uses the 'video'-element to achieve to some cool things.

source: https://github.com/peebeebee/pipodoro