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<html><body><form id="myForm"> Select a file to upload: <input type="file" id="myFile"></form><p>Click the button below to display the id of the form the file button above belongs to.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myFile").form.id; document.getElementById("demo").innerHTML = x;}</script></body></html>