Until now, if you had a responsive website you had to write code to serve optimal banner size for each device. If you had separate mobile and desktop websites, you picked a different banner size for each website. Responsive banners allow you to integrate one banner code in your responsive, mobile or desktop websites and serve right banner sizes. Responsive banner currently supports leaderboard (horizontal banner) placement. The served banner size depends on parent container width. For example, if the container width is greater than 728 pixels, banner of size 728x90 is served. If the container width is less than 728 pixels, banner of size 320x50 is served.