Pier Bover created CB-11885:

             Summary: iframe message error
                 Key: CB-11885
                 URL: https://issues.apache.org/jira/browse/CB-11885
             Project: Apache Cordova
          Issue Type: Bug
          Components: Plugin WKWebViewEngine
    Affects Versions: 4.2.1
         Environment: iOS 9
            Reporter: Pier Bover
            Assignee: Shazron Abdullah

When trying to communicate between an iframe and the main window using 
Window.postMessage() I get the error:

`Blocked a frame with origin "null" from accessing a frame with origin "null".`

This only happens from the iframe to the main window, when communicating the 
other way around it works fine.

Both files are run locally. The error only happens after adding the plugin 
`cordova-plugin-wkwebview-engine`. When using UIWebView the error does not 

The weird thing is that this error is shown exactly 11 times, but the message 
goes through anyway. See this screenshot taken from Safari while using the 
simulator: http://i.imgur.com/JJkIEy5.jpg You can the Messageevent happening at 
the end.

I have added `sandbox="allow-same-origin allow-scripts allow-popups 
allow-forms"` to the iframe tag and it fix it.

This is the code that listens to the message:
`window.addEventListener("message", eventHandler, false);`

And this is the code that emits the message from the iframe:

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