IE - Security error with new Worker(URL.createObjectURL(new Blob([workerjs],{type:'text/javascript'})))

[Aymeric Vitte]

Why IE(11) does not allow this while this is working on FF and Chrome? 
[1] seems to suggest that it is "by design".

Regards
Aymeric

[1] 
https://connect.microsoft.com/IE/feedback/details/779379/unable-to-spawn-worker-from-blob-url

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