<!DOCTYPE html> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=763626 --> <head> <title>Test for Bug 763626</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <script type="application/javascript"> SimpleTest.waitForExplicitFinish(); function boom() { var r = document.createElement("iframe").sandbox; SpecialPowers.DOMWindowUtils.garbageCollect(); is("" + r, "", "ToString should return empty string when element is gone"); SimpleTest.finish(); } </script> </head> <body onload="boom();"></body> </html>