CONSOLE MESSAGE: SyntaxError: Invalid character '\u2073' First load a script with a wrong charset then again with the right one. Second attempt should work and 'scriptSuccess' should be set to true. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Loading with the wrong encoding... PASS Got expected error: 'SyntaxError' PASS window.scriptSuccess is undefined. Now loading with the right encoding... PASS scriptSuccess is true PASS successfullyParsed is true TEST COMPLETE