Permission denied to access property 'document' [duplicate]

Answer 1

You can't.

Why? It's a security feature to stop Cross-Site Scripting (XSS) attacks.

For example, you have an iframe that loads www.facebook.com. If this security feature wasn't implemented, you could easily fetch data from that site. From cookies, to what content is on the page.

There is more helpful information about this here: http://www.veracode.com/security/xss

Answer 2

Try

var frame = document.getElementById('f1');
var doc = frame.contentWindow || frame.contentDocument;
var html = doc.document.body.innerHTML

Source: Frame/IFrame contentDocument Property.

Answer 3

I didn't look at the JS, but you can't get HTML from an remote page with javascript. Try PHP's cURL.