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https://issues.apache.org/jira/browse/CB-11885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15513490#comment-15513490
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Pier Bover commented on CB-11885:
---------------------------------

[~shazron] is this a known problem?

> 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 
> happen.
> 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 see the MessageEvent 
> happening at the end.
> I have added {{sandbox="allow-same-origin allow-scripts allow-popups 
> allow-forms"}} to the iframe tag but it didn't 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:
> {{parent.postMessage(something,"*")}}



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