<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>Test for Bug 886262</title> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <script src="/tests/SimpleTest/EventUtils.js"></script> </head> <script> window.addEventListener("message", function(e){ window.open("file_iframe_sandbox_a_if18.html", "_self"); }); </script> <body> I'm just here to navigate to file_iframe_sandbox_a_if18.html after my owning iframe has had allow-same-origin added. </body> </html>