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Is it possible to debug Javascript running in an iFrame in IE9

I have a facebook app that has a lot of Javascript that doesn't work correctly in IE (8 and 9), so I would like to use a debugger. Unfortunately the IE JS debugger doesn't let you select Javascript files running in the iFrame and I can't run it directly, since then facebook login doesn't work.

Is there a way to get IE developer tools to recognize Javascript running inside an iFrame?

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Make sure you are debugging the script tab first, then search for the function you want to set a breakpoint on. It should highlight / find the script file.

I use IE Developer Tools to regularly debug IFrame based applications.

Do scripts from other domains appear in the original explorer (next to the debug button) in the script tab?



Edit:

Using this simple test, I have verified that IE Developer Tools will upload scripts to external domains:

<html>
<head>
</head>
<body>
<iframe src="http://msdn.com" height="400" width="400" />
<body>
</html>
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