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While trying to understand some the examples found on the "Beyond the Canvas" page on Github under the header "Element specific listeners", I continually get the error: "Uncaught ReferenceError: context is not defined." I have followed the instructions to a tee, (uncommented the necessary lines in index.html) and the puzzling thing is that when I comment out the line throwing the error, the code works as advertised. I also cannot find the function context in the other .js files, so I am wondering if context is left over from a previous version, or has yet to be added. Can anyone spread some light for me?