As I understand, the webserver will send p3p information to the browser, but will the browser then present that data to the javascript engine via some API?
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No -- P3P information is not exposed to JavaScript, and generally has very little effect on browser behavior in general, other than a few weird edge cases on MSIE.
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duskwuff -inactive-
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Do you know a reference to these edge cases? – Alexander Bird Oct 10 '11 at 02:39
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1Check the "related questions" sidebar for some examples. The most common "gotcha" appears to be that P3P headers can be required if you set cookies from pages loaded in IFRAMEs. – duskwuff -inactive- Oct 10 '11 at 04:06