http://www.w3.org/TR/css3-values/#relative0

This is a paragraph without any children. It exists as a control to show the basic font size in use.

[#p01] This is a paragraph with a span element embedded within it. The span should be larger than the text that surrounds it and match the size of the previous paragraph.

[#p02] This is a paragraph with a span element embedded within it. The span should be smaller than the text that surrounds it and match the size of text outisde the span in the previous paragraph.