It scrolls in Safari (7.0.2), although you have to scroll quite a bit before you actually start seeing the content below the image(s). In addition, in my browser window of size 1024 × 669 pixels, the text in text-right.png¹ is cut off from the author down and is impossible to read since scrolling doesn’t move the image.

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¹ — http://www.5280.com/girlsnextdoor/img/text-right.png