[jQuery] frames/iframes syntax?

[jQuery] frames/iframes syntax?

I would like to reference some elements in an iframe on the page.
A reference in stock javascript would look like this:
window.frames[0].document.getElementsByTagName('head');
But I haven't been able to figure out the analogous jQuery call ...
Could someone provide the syntax for this? (i.e referencing an element
in an iframe from the parent)
Thanks in advance,
John
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