windows.open 후 close(); 가 작동하지 않을경우
testForm.submit();
window.open("","testForm").close();
-> 잘 작동하다가 어느시점에서 에러가남.
ex ) let winOpen = window.open("_top" ,"testForm"," ...... )
winOpen.close() ;
window.open자체를 변수에 담고 닫아주면 에러나지않음
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