padolsey/operative — pull request #26 by csimi (2014-09-12 14:08:21+00:00)
Title: Fall back to iframe if worker via blob is not supported and opScriptURL is not set

Operative completely fails right now if worker via blob is not supported and you don't set the opScriptURL with setSelfURL.
I think it would be a better idea to fall back to iframe in this case.