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As discussed here: http://lists.w3.org/Archives/Public/public-webapps/2012AprJun/0295.html The spec has several legacy places where it forbids dispatching trusted events. These need to be corrected in order to align with DOM4:
3.6 - NotSupportedError, last sentence initEvent definition -- appies to more than just events created with "createEvent" dispatchEvent's Exception list.
Fixed in latest version.
As the opener, I approve :-)