This demonstrates high-performance 2D graphics using giza, a little WebGL library that I'm developing. Click the center to generate a new random tree structure.
The antialiased silhouette is achieved in the fragment shader using the OES_standard_derivatives extension.
If you're wondering why I called this monarchy, I had planned for this to be a visualization of the royal family tree from William the Conqueror to Elizabeth II. Other projects lured me away before I got very far!
You can see the code for this demo on github.
By the way, if you shrink the window, the canvas attempts to maintain its aspect ratio using a responsive CSS pattern called Basic Fluid Image as described here.