A basic overview of how to use a Service Worker to provide an offline cache for your Progressive Web App
Fractals are fascinating!
Hugely complex structures can be generated from relatively simple algorithms. The key component to fractals is self reference and recursion.
One of the most recognised fractals is the one below generated from the Mandelbrot set.
The Mandlebrot set is actually the distinctive central black area. The coloured points are numbers out with the set; their colour is determined by how quickly (number of iterations) they leave the set.