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Vaclav LukasekVaclav Lukasek 

JS access to window.parent .... on visual force page

Its caused because Page is loaded from different domain:
Sample I loaded page:
But component with visual page contains
And because first domain contains 'my' and second one 'visual', it will be killed by Browser as Crossdomain scripting
I also like to know some workaround
Vaclav LukasekVaclav Lukasek
Cause JS failure Permission denied to access property. Workaround by using S-Control is no longer supported. Is there another solution? Otherwise in Summer2015 release some of functionallity will stop working