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Does HTML 5 provide a way to run or execute a downloaded file? I've read about the File API to download files but haven't seen mention of how to execute it. It's probably frowned upon due to security concerns, but sometimes there's good reason to do this. To mitigate security issues, signed files could be required as a consideration for future enhancements of HTML5.

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    One would certainly hope not. Commented Dec 27, 2011 at 23:52
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    'sometimes there's good reason to do this' - there is not, and won't be a reason to violate the security mechanisms.
    – Bakudan
    Commented Dec 28, 2011 at 17:05
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    Doesn't matter how good would be the intentions of such suggestion. Someone would find a way to pervert it and violate poor inocent machines.
    – petervaz
    Commented Dec 28, 2011 at 17:38

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No, there is no way to download and automatically execute a file with HTML5.

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