JSFiddle - React, Tailwind, and code Playground

HTML

<head>
<title>log in</title>
</head>
<body>
<form action="login.php" method="POST">
user name : <input type="text" name="user"> <br>
user pass : <input type="password" name="pass"> <br>
<input type="submit" value="submit"> 
</form>
</body>

JavaScript

$(document).ready(function() {

    function checkKey(e) {
        if (e.keyCode == 13) {

            if (!e) var e = window.event;

            e.cancelBubble = true;
            e.returnValue = false;

            if (e.stopPropagation) {
                e.stopPropagation();
                e.preventDefault();
            }
        }
    }

    if ($.browser.mozilla) {
        $("input").keydown(checkKey);
    } else {
        $("input").keydown(checkKey);
    }
})