Demos for the Checkerboard framework (GitHub, NPM).
node demo-server
Go to http://server:9999/demos/demo.html; e.g. http://localhost:9999/demos/whiteboard.html.
Open in multiple tabs or multiple devices to see the synchronization effect. Restart the server to clear the store.
Open the console on all devices. Observe what happens when you click on the document body, and when you refresh the page.
A simple whiteboard. Observe how drawings stay when you refresh the page.
A multitouch version of whiteboard.
Demonstrates the synchronization effect with extreme lag. Observe that eventually the sum of bank + pocket 1 + pocket 2 will always be 100, even if you "trick" the server (e.g. by simulataneously withdrawing $20 from both ATMs when there is only $20 in the bank).