test: follow instructions below

At first the next two worlds ("foo bar") should load like control section B (bottom of the page). Click button and it should look like the control section A. Finally hit button and the page should return to its original state, like at the bottom of the page. Button A removes the class attribute from the foo, button B puts it back. Elements with that class should be floated right with a font-size of 2em.

foo

control: after test A it should look like this (foo not floating)

foo
bar

control: after test B it should look like this (foo floating)

foo
bar