Seems like you're running into a lot of the same issues I did 
:) https://github.com/kripken/emscripten/issues/3571

I solved it by proxying 'wheel' instead of 'DOMMouseScroll' and 
'mousewheel', and adding a stub "canvas.onwheel = function() {};" on the 
fake canvas in proxyWorker. I'm not on incoming/master right now, so I 
haven't tested it there, but it might solve the issue.

On Thursday, May 5, 2016 at 11:08:11 PM UTC-7, awt wrote:
>
> Hi,
>
> As of now, Firefox uses DOMMouseScroll and Chrome uses mousewheel but the 
> Canvas object in ProxyWorker.js does not seem to have a onwheel or 
> onmousewheel event defined . I was checking 
> out _emscripten_set_wheel_callback and it seems that we only support the 
> 'wheel' and 'mousewheel' event so we can't really register for a 
> DOMMouseScroll event.
>
> Would it make sense to add the 'wheel' event to ProxyClient.js and the 
> onwheel event to the Canvas object in ProxyWorker.js? 
>

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