p { background-color : red }
p[class~="b"] { background-color : lime }
address { background-color : red }
address[title~="foo"] { background-color : lime }
span[class~="b"] { background-color : red }

<p class="a b c">This paragraph should have green background because CLASS
  contains &quot;b&quot;</p>
<address title="tot foo bar">
<span class="a c">This address should also</span>
  <span class="a bb c">have green background because the selector in the last
    rule does not apply to the inner SPANs.</span>
</address>