Ah thanks of course, I was confused... so I assume all the mockup patterns are already available in Plone 5?
If that's the case, I don't understand why using using "pat-toggle" CSS class as per mockup docs does not work... for example, using the simplest example from the mockup docs:
<button type="button"
class="btn btn-default pat-toggle"
data-pat-toggle="value:btn-lg;">This button goes bigger/smaller!</button>
Does not change the button size when clicked. I tried some other CSS classes than "btn-large" as well (that for sure produce a visual effect) but nothing happens. It's as if the pattern (or mockup) is not installed (no javascript errors in console).