http://www.w3.org/TR/css3-box/#overflow-y

[#d01] Following is a paragraph containing an image. It should have an y-axis overflow effect where it overflows its parent element.

[#d02] Following is a paragraph containing an image. It should have an y-axis overflow effect where it overflows its parent element.

[#d03] Following is a paragraph containing an image. It should have an y-axis overflow effect where it overflows its parent element.