div.stub span, div.stub address, div.stub *|q, div.stub *|r { background-color : red }
address, *|q, *|r { display : block  ; margin-bottom : 1em }
div.stub *:not(p) { background-color : lime }

<div class="stub">
<p>
<span>The text in this paragraph should have a green background</span>
</p>
<address>This address should have a green background</address>
<q xmlns="http://www.example.org/a">This a:q element should have a green background</q>
<r xmlns="">This r element w/o namespace should have a green background</r>
<p>Thhis paragraph should NOT have a green background</p>
</div>