try example in every other browser, scope should be from created iframe
Sam fixed a bunch of these bugs lately, e.g. https://bugs.webkit.org/show_bug.cgi?id=59215 , so there is a decent chance this is fixed. However the test case linked above appears to have gone away. If this test case is still failing then please reopen & post the test as an attachment. Since I cannot repro without a test case, closing.