How to pick element inside iframe using document.getElementById

I have a iframe like this

<iframe name="myframe1" id="myframe1" width="100%" height="100%" src="a.html">
<html>
    <head></head>
    <frameset name="myframe2" cols="0%, 100%" border="0" frameBorder="0" frameSpacing="0">
        <frame name="page1" src="c.html" scrolling="no"></frame>
        <frame name="page2" src="d.html" >
            <html>
                <head></head>
                <body id="top">
                    <div id="div1">
                        <div id="div2">
                            <div id="div3">
                                <ul id="x">
                                    <li>a</li>
                                    <li>b</li>
                                </ul>
                            </div>
                        </div>
                    </div>
                </body>
            </html>

        </frame>

    </frameset>
</html>
</iframe>

I want to refer to the element "x". I tried in several ways but I couldn't find a solution.

document.getElementById('myframe1').contentWindow.document.getElementById('x')

Fiddle

contentWindow is supported by all browsers including the older versions of IE.

Note that if the iframe's src is from another domain, you won't be able to access its content due to the Same Origin Policy.

use contentDocument to achieve this

var iframe = document.getElementById('iframeId');
var innerDoc = (iframe.contentDocument) 
               ? iframe.contentDocument 
               : iframe.contentWindow.document;

var ulObj = innerDoc.getElementById("ID_TO_SEARCH");

(this is to add to the chosen answer)

Make sure the iframe is loaded before you

contentWindow.document

Otherwise, your getElementById will be null.

PS: Can't comment, still low reputation to comment, but this is a follow-up on the chosen answer as I've spent some good debugging time trying to figure out I should force the iframe load before selecting the inner-iframe element.

How to pick element inside iframe using document.getElementById

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