A Simple HTML5 Form Validation

HTML

<h1>A Simple HTML5 Form Validation</h1>
<p>Leave the field empty and submit the form to see what happens.</p>

<form>
    <label for="email">* Email</label>
    <input type="email" id="email" required>
    <input type="submit" value="Submit">
</form>

<footer>Which browsers support this feature? - <a href=http://caniuse.com/form-validation>Caniuse.com</a></footer>

CSS

body {
    margin: 1em;
}
footer {
    margin-top: 2em;
}