I've been experiencing issues using postMessage in Firefox and Internet Explorer, whilst Google Chrome has worked sound as a pound each time.
What I'm trying to do is use postMessage from the iFrame to my parent with an action of closeForm. The iFrame URL is a sub-domain of the parent, the iFrame source itself also has document.domain = document.domain which I believe should have sorted my issues.
Currently the iFrame JavaScript is calling window.top.postMessage('closeForm', '*') which as I've mentioned works a treat in Chrome, but in Firefox I get ReferenceError: window is undefined so I changed window.top to parent.postMessage but I get get the same thing only with parent is not defined.
The same thing doesn't work in IE9 either. Any suggestions?
window.parent works for me in Firefox on OS X