Fixing kendo.drawing.drawDOM in IE9: Unable to get property ‘add’ of undefined or null reference.

I was getting the error:
Unable to get property 'add' of undefined or null reference.
, when calling kendo.drawing.drawDOM in IE9 with kendo 2017.1.118
This was fixed by using the polyfill: https://github.com/eligrey/classList.js

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