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<!DOCTYPE html> <html> <head> <script> function getElements() { var x = document.getElementsByTagName("input"); document.getElementById("demo").innerHTML = x.length; } </script> </head> <body> <input type="text" size="20"><br> <input type="text" size="20"><br> <input type="text" size="20"><br> <p> <input type="button" onclick="getElements()" value="How many input elements?"> </p> <p id="demo"></p> </body> </html>