synapse/jsfiddles/register_login/demo.html

<div>
    <p>This registration/login demo requires a home server to be running on http://localhost:8008</p>
</div>
<form class="registrationForm">
    <input type="text" id="user" placeholder="Username"></input>
    <input type="password" id="password" placeholder="Password"></input>
    <input type="button" class="register" value="Register"></input>
</form>
<form class="loginForm">
    <input type="text" id="userLogin" placeholder="Username"></input>
    <input type="password" id="passwordLogin" placeholder="Password"></input>
    <input type="button" class="login" value="Login"></input>
</form>
<div class="loggedin">
    <p id="welcomeText"></p>
    <input type="button" class="testToken" value="Test token"></input>
    <input type="button" class="logout" value="Logout"></input>
    <p id="imSyncText"></p>
</div>