<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=789315 --> <head> <meta charset="utf-8"> <title>Test for Bug 789315</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=789315">Mozilla Bug 789315</a> <form id="a"><input name="b" type="file"/></form> <script type="text/javascript"> var obj = new FormData(document.getElementById('a')).get('b'); is(obj, "", "We want an empty string."); </script> </body> </html>