У вашего броузера проблема в совместимости с HTML5
DRAKON Editor 1.12 in action with Dijkstra's algorithm.
Dijkstra's algorithm finds the shortest path in a graph.
The language in this video is DRAKON-Python.
Feel free to try that at home.
Hint: in DRAKON Editor, press and hold Shift in order to edit in the "Smart" mode.
The diagram of Dijkstra's algorithm
http://drakon-editor.sourceforge.net/video02/dijkstra.png
DRAKON Editor homepage:
http://drakon-editor.sourceforge.net/
The source code for Dijkstra's algorithm in DRAKON-Python
http://sourceforge.net/projects/drakon-editor/files/examples/dijkstra.drn/download