title: <input type="datetime-local"> How to display minutes with 15mns interval
body: <p>I'm building some kind of booking app and I want to display to the user a datetimepicker input with only the possibility to book every quarter of an hour.</p>
  <p>Example:</p>
  <ul>
  <li>12:00</li>
  <li>12:15</li>
  <li>12:30</li>
  <li>12:45</li>
  </ul>
  <p>I couldn't find a way to do it with simple HTML. I need some guidance for this.</p>
  <p>I tried to used &quot;step&quot; but apparently seem to only increment the value when clicking. This is not what I want.
  My goal is to display only quarter values</p>