This experiment is a real-time, interactive Mandelbrot renderer using SharedArrayBuffers, Atomics and Web Workers.
The interesting thing about this experiment is that it only sends one initial postMessage() to share the SharedArrayBuffer with the Worker. After that, I rely on Atomics to put the worker to sleep and to signal when the pixels need to get re-rendered. The zoom level and coordinates are encoded into the SAB as well.
On the main thread, a requestAnimationFrame() loop draws the SAB to screen every frame. This means you can watch the Worker do its work.