[cl1] This paragraph should show extra space where there would ordinarily not be any. There should also be preservation of returns as this sentence very clearly demonstrates.

[cl2] This paragraph should not word-wrap, no matter how long the paragraph might be or over how many lines it would ordinarily wrap, as it has been set to white-space: nowrap and that should have the obvious effect.

[cl1] This paragraph should show extra space, [cl3] except in the second half.

[cl4] This paragraph should show extra space where there would ordinarily not be any. It should also wrap lines in any situation where they exceed the width of the containing element, such as with this sentence. There should also be preservation of returns as this sentence very clearly demonstrates.

[cl5] This paragraph should not show extra spaces where there would ordinarily not be any; in other words, whitespace is collapsed. It should also wrap lines in any situation where they exceed the width of the containing element, such as with this sentence. However, there should be preservation of returns as this sentence very clearly demonstrates.