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Alex Rivera
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With this page: <!DOCTYPE html> <html> <head> <script> "use strict"; var foo = 2; delete foo; </script> </head> <body></body> </html> Firebug console gives: applying the 'delete' operator to an unqualified name is deprecated >>> foo ReferenceError: foo is not defined foo But then this is successful: >>> var bar = 2; undefined >>> delete bar; true Even if you comment out delete foo; so that the script does not break, deleting bar is still successful despite the fact it "is a property of a Global object as it is created via variable declaration and so has DontDelete attribute ": >>> foo 2 >>> delete foo false >>> var bar = 2; undefined >>> delete bar true Is it possible to enable "strict mode" in FireBug and or Chrome's console?
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