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<html><body><form id="frm1" action="https://www.w3schools.com/action_page.php"> First name: <input type="text" name="fname" value="Donald"><br> Last name: <input type="text" name="lname" value="Duck"><br><br> <input type="submit" value="Submit"></form><p>Click "Try it" to display the number of elements the form:</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("frm1").length; document.getElementById("demo").innerHTML = x;}</script></body><!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_form_length by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:07:06 GMT --></html>