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by jabo 4358 days ago 

    > Please don't use this unless you really have to
CORS is not fully supported in older versions of IE. So that essentially means that we need to resort to these hacks just for IE.
1 comments
jpillora 4357 days ago
It would be nice if we could forego these hacks, as @jabo mentioned, hacking around lack of support is our only choice. If it's not iframe+postMessage, then it'd be flash - either way it's suboptimal.
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