[Web Coding series]: Stencil Shadow Volume Demo

I am writing a book on web development. I have come to the part where I need to demonstrate how to implement Stencil Shadow Volume in WebGL. Your task is to write a very simple .html file for me, demonstrating a vertical square casting a shadow on a horizontal plane it sits on. The code needs to be as simple as possible, so that the technique can be clearly illustrated. A good example on WebGL utilizing a stencil shadow volume can be found at [login to view URL] The problems with the code it that it is too complex, and that it does not use the WebGL library I have developed: [login to view URL] You can check how to use my library at [login to view URL] The web contains many materials on this topic. If you need a good documentation for WebGL, you can try to check the OpenGL ES 2.0 official guide. If possible, I would like you to write a generic function that implements Stencil Shadow Volume and include it into webgl-library.js. I should have done this on my own, but I am already lagging behind the schedule so I would like to delegate some tasks. As you bid, please tell me your relevant experience. An experienced developer should be able to complete this in one day, but I can allow you one week to complete it.