JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<label class="txtlabel">Username/Email</label>
<input id="username" type="text" name="login-username">
<label class="txtlabel">Kennwort</label>
<input id="kennwort" type="password" name="login-password">

JavaScript

$(document).ready(function(e) {
	$('#username').val('username');
	$('#kennwort').val('password');
});