Event Parent.function() in Iframe cross domain

Question

I have the following pages:

www.aaa.com/a.html

 <input onClick=parent.miFunction() />

www.bbb.com/b.html

<script>
miFunction(){
 alert("sss")
}
</script>
<iframe src="www.aaa.com/a.html"> </iframe>

The problem happend when somebody presses the button in www.aaa.com/a.html. The console logs the following error:

live:1 Uncaught DOMException: Blocked a frame with origin "www.aaa.com" from accessing a cross-origin frame. at HTMLButtonElement.onclick (www.aaa.com/a.html:1:8)

Thank you!