<img align> bug in
Opera
The lilac box is 100 pixels wide, and contains two images. The
red-cross image is 75 pixels square; the blue-cross image is 50 pixels
square, with align=right set in the markup.

This is an image of how I’d expect an HTML/CSS user-agent to render the live markup.

This is an image of how Opera 9.51 renders the markup.
This markup is the same as the live version, but with additional CSS workarounds applied. Opera 9.51 renders this identically to the reference rendering.