You can’t stop it, at least not in any way I know (and I have tried a lot). There is a script in the iframe destination that tries to access your document, probably looking for global functions it can call to enable the API.
Another thing is that the error persists even when using their own iframe API: http://jsbin.com/izabed/1/edit
There is no harm in this, your video will work fine. But it looks kind of bold if you run it in a console. They should probably include this as a parameter, and at first I thought that this was the idea of the origin
parameter, but it doesn’t make any difference.
It’s also worth noting that their own demo displays the same error (and others). Also, if you use the embed
tag instead of iframe, it wont display any errors.
So you could do something like this to prevent the error in most desktop browsers:
if(haveflash) {
// use <embed>
} else {
// use iframe
}
Update
Most browsers no longer support flash, nor does Adobe. Unfortunately, this means that using <embed>
is no longer a viable option.