Handle the case when observed node placed inside of detached iframe in ie11 #40
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There is the case when node that should be observed placed inside of iframe that will be detached in some cases. In Chrome it will work just fine because defaultView there becomes null, but in ie it gets the following structure


That case leads to the error in the isSVGGraphicsElement function due to the lack of SVGElement(as well as other properties)
When getWindowOf returns the window with undefined properties the next step "target instanceof getWindowOf(target).SVGElement" raise an error