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Here http://www.whatwg.org/specs/web-apps/current-work/#custom-handlers As per the idl definition, unregisterProtocolHandler() does not return any value. Below, the spec specifies that it return state which need to be corrected. state = window . navigator . unregisterProtocolHandler(scheme, url) state = window . navigator . unregisterContentHandler(mimeType, url)
This will be fixed in the next update. Thanks!