<!DOCTYPE HTML> <html dir="ltr" xml:lang="en-US" lang="en-US"> <head> <meta charset="utf-8"> <script> var _console = { foo: "bar" } window.console = _console; function loadIFrame() { var iframe = document.body.querySelector("iframe"); iframe.addEventListener("load", function() { iframe.removeEventListener("load", arguments.callee, true); }, true); iframe.setAttribute("src", "test-console.html"); } </script> </head> <body> <iframe></iframe> </body>