HTML5 Form Input Types and Attributes

HTML

<link rel="stylesheet" href="http://dryan.com/css3/css/html5-reset.css">
<form action="/echo/html/" method="POST">
    <input type="text" name="name" placeholder="name" autofocus />
    <input type="number" name="age" min="13" max="100" placeholder="age" />
    <button type="submit">submit</button>
</form>

CSS

form {
    margin: 1em;
}
input, button {
    border: 1px solid silver;
    background: white;
    padding: 5px;
    margin-bottom: 1em;
    display: block;
}