Recently I was studying responsive design a lot and designed couple of sites. But I was wondering how would I use Google AdSense (which is pixel based) ads on my responsive design?
Very typical example is suppose I have a 728x90
ads on header. Or if I do a mobile first approach I would need different versions of ad sizes for different view posts but Google doesn't allow more than three ad unit per page (as far as I know).
So, Question: What is the right approach/best practice of using Google AdSense on a responsive site design?