Failed to execute 'postMessage' on 'DOMWindow': The target origin provided does not match the recipient window's origin ('null')

Question

I have a game in heroku, now I\'m trying to make it work in Facebook canvas, but, while it works in Firefox, in Chrome and IE doesn\'t.

IE shows a warning with a but

Answer 1

Another reason this could be happening is if you are using an iframe that has the sandbox attribute and allow-same-origin isn't set e.g.:

// page.html



// iframe.html

I haven't found a solution other than:

• add allow-same-origin to the sandbox (didn't want to do that)
• use f.postMessage("hello world!", '*');