clear:both on the pseudo-element 'clears' any float that is within the
same block formatting context (here: body).
The pseudo-element sticks to the div.z, but the clearance moves it below
the floated leftnav.
Therefore, the pseudo-element stretches the element to which it is attached.
This might be easier to see when {height: 0; visibility: hidden;} is
removed: the content-period slides under the float.
Ingo
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