We've learned before that we get user input with the input element.

<html>
<head><style>body {min-height: 300px;} input { font-size: 16px; } textarea { font-size: 16px; } </style></head>
<body>
<h1>Sign up</h1>
<input>
</body>
</html>]]>

The input element is empty, so we create it with <input>.