6 :default + span { color: green }
7 span.reverse { color: green }
8 :default + span.reverse { color: red }
9 button { display: none }
15 <button type=
"submit" checked=
"checked" id=
"foo"></button>
16 <span>There should be no red.
</span>
19 <button type=
"submit"></button><span class=
"reverse">There should be no red.
</span>