20. HTML
…
<label for="email">Email *</label>
<input type="email" id="email" name="email"
placeholder="e.g. ryan@example.net"
title="Please enter a valid email" required />
<p class="validation01">
<span class="invalid">Please enter a valid
email address e.g. ryan@example.com</span>
<span class="valid">Thank you for entering a
valid email</span>
</p>
…