Is cross-origin postMessage broken in IE10?

Question

I\'m trying to make a trivial postMessage example work...

• in IE10
• between windows/tabs (vs. iframes)
• across origins

Answer 1

Create a proxy page on the same host as launcher. Proxy page has an iframe with source set to remote page. Cross-origin postMessage will now work in IE10 like so:

• Remote page uses window.parent.postMessage to pass data to proxy page. As this uses iframes, it's supported by IE10
• Proxy page uses window.opener.postMessage to pass data back to launcher page. As this is on same domain - there are no cross-origin issues. It can also directly call global methods on the launcher page if you don't want to use postMessage - eg. window.opener.someMethod(data)

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Sample (all URLs are fictitous)

Launcher page at http://example.com/launcher.htm

    
        
        
    
    

    
    
    Open remote 

    

    

Proxy page at http://example.com/proxy.htm

Remote page at http://example.net/remote.htm

    
        
        
    
    

    
    
    
Remote page

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