[thelist] P3P, thrid-party cookies, and iframes

James Hardy evolt at weeb.biz
Tue Mar 30 10:31:49 CDT 2010

If you are www.bills-site.com and the partner is www.partners-site.net then
at the moment you have an iframe on www.partners-site.net pointing to

What if you make your site work for the DNS name of
bills-site.partners-site.net and get www.partners-site.net to link to this
rather than your normal domain, possibly even setting your cookies to
domain: *.partners-site.net (assuming you trust your partner with your

IE might then not treat your cookies as third party cookies (as it will be
from the same domain - more or less)

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