Debugging iframes with Chrome developer tools

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I’d like to use the Chrome developer console to look at variables and DOM elements in my app, but the app exists inside an iframe (since it’s an OpenSocial app).

So the situation is:

<containing site>
 <iframe id='foo' src="https://stackoverflow.com/questions/3275816/different domain">
  ... my app ...
 </iframe>
</containing site>

Is there any way to access things happening in that iframe from the developer console? If I try to do document.getElementById("foo").something, it doesn’t work, probably because the iframe is in a different domain.

I can’t open the iframe contents in a new tab, because the iframe needs to be able to talk to the containing site as well.

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