JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Key Event test</title>
</head>
<body>
    <input type="text" id="a" name="test" />
    <script>
        document.getElementById("a").onkeypress = function(e) {
            e = e || window.event;
            var k = e.keyCode || e.which;
            this.value = String.fromCharCode(k);
            return false;
        }
    </script>
</body>
</html>