JSFiddle - React, Tailwind, and code Playground

HTML

<table>
            <tr>
                <td>User Name: </td>
                <td><input type="text" name="username" id="username"></td>

            </tr>           
            <tr>
                <td>Password :</td>
                <td>
                    <input type="password" name="password" id="password">
                </td>

            </tr>
            <tr>
                <td></td>
                <td><input type="submit" name="Login" value="Login"></td>

            </tr>

        </table>

JavaScript

var item = document.getElementById('password');
item.onkeydown = function(event) {
     if(event.keyCode == 13 || event.which==13){                 
          alert("You have entered ENTER key");                    
     }
}