<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=604592 --> <head> <title>Test for Bug 604592</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=604592">Mozilla Bug 604592</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> <script type="application/javascript"> /** Test for Bug 604592 **/ function testInStrictMode() { "use strict"; try { document.body.prefix = "foo"; ok(false, "Should not have reached this point"); } catch (e) { ok(e instanceof TypeError, "Expected a TypeError"); } } testInStrictMode(); document.body.prefix = "foo"; ok(document.body.prefix === null, "Expected strictly equal to null, got " + document.body.prefix); </script> </pre> </body> </html>