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https://issues.apache.org/jira/browse/CB-11885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517699#comment-15517699
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Shazron Abdullah commented on CB-11885:
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Thanks for filing that WebKit bug!
> 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
> Labels: wkwebview-known-issues
>
> 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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