When you use the “test” command, it should try to open your default web browser. If you copy the URL (it should start with http://localhost) you should be able to test in other browsers.
If you compile using -Ddom, it enables “DOM mode”, which does not use canvas unless you get into BitmapData manipulation, or using the Graphics class in a visible way (invisible fills should be fine).
If you are loading images, for example, DOM mode uses Image tags and CSS3 animation. Only if you modify the BitmapData will it become a canvas. If you use bitmapData.draw or graphics.beginBitmapFill that image would also be drawn to a canvas, but ordinary display list would not.
Without -Ddom it blits to one single canvas, so either way (whichever approach is best) I think you may be able to do it