Can I edit styles of an HTML page which has shown as an iframe?

Question

There is an iframe in my website. It shows an article. And I need to make a button to increase the font size of that HTML page. Button must be in the parent page. Is it possible ? And how ?

Answer 1

Possible duplicate:

How can I access iframe elements with Javascript?

Also:

http://www.dyn-web.com/tutorials/iframes/refs/iframe.php

You can access the iframe DOM element from JavaScript and check it for

ifrm.contentDocument or

ifrm.contentWindow.document properties.

// reference to iframe with id 'ifrm'
var ifrm = document.getElementById('ifrm');

// using reference to iframe (ifrm) obtained above
var win = ifrm.contentWindow; // reference to iframe's window
// reference to document in iframe
var doc = ifrm.contentDocument? ifrm.contentDocument: ifrm.contentWindow.document;
// reference to form named 'demoForm' in iframe
var form = doc.getElementById('demoForm');