It works well, but then it does not scroll. One way of doing it is to place the HTMLViewer on a ContainerControl with a width 16 pt less than that of the HTMLViewer. Then place an instance of the CC on the window. The scrollbar will never show, and the viewer will scroll with the wheel. Hopefully with a trackpad as well, requires some testing.
Except the method described at the linked SO thread for webkit precisely suppresses scrolling through JavaScript, because the CSS one does not work into it. Just in IE.
I tried the code snippet in this answer: http://stackoverflow.com/a/13184693 and could still scroll with my scroll wheel but no scrollbars were displayed. I think that answer combined with JS to scroll down would work.
That said, since the OP has control of the program, using the ContainerControl works with all pages without extra code in the pages. That means even in Internet content.