Some text inside a paragraph that is a direct child of the body tag. It is also a first child of the body.

Some text inside a paragraph that is a NOT a direct child of the body tag because its nested in a div. But it is a first child of the div

Some more text inside a paragraph that is a direct child of the body tag. It is NOT a first child of anything.

From:
http://meyerweb.com/eric/articles/webrev/200006b.html and http://www.w3schools.com/cssref/sel_firstchild.asp and http://css-tricks.com/child-and-sibling-selectors/