title: Is postMessage() supported in InternetExplorer 7?
body: <p>I'm testing my code in using IE9 which lets me also test IE8 and IE7 using the developer tool. It seems that postMessage works when testing in the IE7 mode.</p>
  
  <p>I think postMessage should not work in IE7 but my test says it does and I think it's because I'm using IE9 to do the test.</p>
  
  <p>Is IE7 supposed to support postMessage at all?</p>