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Re:The XSS Game by Google by n_ on Wednesday November 23, 2016 @05:34PM (#13026342)
On level 3:

  https://xss-game.appspot.com/level3/frame#'/><script>alert(1)</script>
will execute on load rather than after user input.
Re:The XSS Game by Google by maaarghk on Wednesday November 23, 2016 @06:08PM (#13026530)
yeah, as the notes say you would use onload IRL.