DOM | Prueba - cambiar texto

<!DOCTYPE html>
<html lang="es">
<head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
    <title>Prueba DOM</title>
</head>
<body>
    <p id="parrafo"> The value attribute is a DOMString that contains the current value of the text entered into the text field. You can retrieve this using the HTMLInputElement.value property in JavaScript. let theText = myTextInput.value;. </p>
    <button onclick="cambiar();">Cambiar texto</button>

    <script>
        var elementoP = document.getElementById("parrafo");
        var cambio = "<b>Hola Mundo Cruel</b>";

        var cambiar = function() {
            elementoP.innerHTML = cambio;
            return elementoP;
        }
    </script>
</body>
</html>