There was a time when Netscape and Internet Explorer were the only browsers a web developer had to worry about. But in those days, a website primarily consisted of some text, a few images and some hyperlinks. Remember, tables were still all the rage back then. Nowadays a user may have a few different browsers to choose from, multiple computers running different screen resolutions, a tablet device and a smartphone. And websites, they are a bit more complex than the good old static days. So to meet the needs...