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<html><body><form action="/action_page.php"> Select files: <input type="file" id="myFile" name="img" multiple> <input type="submit"></form><p>Click the "Try it" button to find out if the file upload button accept multiple values (files).</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myFile").multiple; document.getElementById("demo").innerHTML = x;}</script></body></html>