[whatwg] crossorigin property on iframe

Anne van Kesteren annevk at opera.com
Thu Apr 12 12:46:36 PDT 2012

On Thu, 12 Apr 2012 21:30:00 +0200, Ojan Vafai <ojan at chromium.org> wrote:
> We should add a crossorigin property on iframe that causes the request to
> use CORS. If it's an allowed cross-domain request, then the page should
> have access to the DOM of the frame.
> Also, seamless should work (assuming the CORS request succeeded of
> course). One tricky thing here is that seamless needs to stop working if
> the frame is navigated to a different origin to which it does not have  
> CORS access.

This cannot work. CORS only works for sharing a single resource. If you  
expose a DOM on a different origin that *entire* origin would be exposed,  
which would be way more than CORS allows for. You'll have to use a  
postMessage()-based workaround I'm afraid.

Anne van Kesteren

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