One of the Gallery examples, , says:

"Web Viewer objects can be drawn smaller as this resource will resize."

How? There are no format options.

That statement may refer specifically to the web viewer "window" itself. The window can be resized by clicking on it and then clicking and dragging one of the corners. Whether or not the contents resize will likely be dependent on the web content being pulled in - I'd guess in the great majority of the cases not. I've found generally that if the content is larger than the viewer, then scrollbars are invoked.

The example pulls a graphic from yahoo. The graphic scales to the viewer size. I can't duplicate that behavior with a graphic from another website. I've concluded that there is something special about the yahoo graphic.

Image Resizing Example