Communication API "parent -> iframe"

by giacal

HTML

<iframe src="http://jsbin.com/welcome/303/"></iframe>
<button>invia</button>

JavaScript

var it = document.querySelector("iframe"),
    cw = it.contentWindow,
    bt = document.querySelector("button");

bt.addEventListener('click', function(){
    cw.postMessage('Ciao sono tuo padre!', '*');
},false);