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Editorial Team
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Asked: 2026-05-15T12:16:22+00:00

I’m working in a framed environment, and trying to tell if the frame on

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I’m working in a framed environment, and trying to tell if the frame on which some javascript code executes is the top frame (the one that contains the rest).

Up until now I was trying to check it with

window.parent != null

but it always returns false, like in this simple example.

<html>
<head>
  <script>
    alert(parent == null);
  </script>
</head>

<body>
  <h1>OH YEAH!</h1>
</body>
</html>

Is there a way to do this? I doesn’t have to be portable, right now I’m looking for the IE6 solution.

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1 Answer

  1. Editorial Team

    I found this pdf to be very useful:
    http://seclab.stanford.edu/websec/framebusting/framebust.pdf

    In short, if this is too long to read, this is what they ultimately propose : 

    <style>
  html { display :none; }
</style>
<script>
if(self==top){
  document.documentElement.style.display = 'block';
}else{
top.location=self.location;
}
</script>

    You will find many other means to do this in this pdf and each means’ pro and cons.
    Obviously, on browsers without JavaScript, this solution could be painful 😉

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