Please note that none of the demonstrations in css/edge are intended to work in Navigator 4.x. I say this not to denigrate that browser, but instead to spare you any frustration you might otherwise feel. This site exists to explore the cutting edge of HTML+CSS design, and Navigator 4.x is, at four years and counting, just too old to keep up with most things that will be done here. Again, there's nothing wrong with Navigator 4.x, but you probably don't want to use it in this area. Consider it a friendly warning.