HTML5 Markup Basics - HTML5: The Quick and Simple Way to Learn HTML5 - page 20

13 </body>
14 </html>
Next, there will be space for people to enter their age. There might be plenty of reasons for
this, but often it is required for websites that don't want to send information out to youths.
Pretend that the email list is intended for people who are over the age of 13. Since you want
to ask for an age from every person who fills out the form, this will also be “required”.