Error Generated When Identifying Canvas by Class

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Identifying a Canvas with the document.getElementsByClassName function
2.
3.

What is the expected output? What do you see instead?
I am expecting a rendered image, instead I am getting the following error, 
referencing the jsc3d.js "this.canvas.addEventListener is not a function error"


What version of the product are you using? On what operating system?
JSC3d 1.6.5 on Chrome 43.0.2357.81

Please provide any additional information below.
I am working  with Classes rather than IDs because I trying to incorporate 
JSC3D into a Parse.View.  

Original issue reported on code.google.com by [email protected] on 28 May 2015 at 8:58