Changing Ad Size Based on Browser Width in DFP

Question

In DFP Small Business / DoubleClick, I generated the following ad tag for an ad unit with three different sizes along with one creative for each specified sizes. So there are th

Answer 1

For me this post summarises the best options: http://exisweb.net/how-to-use-google-adsense-on-a-responsive-website

I made a WordPress plugin based on #3: https://wordpress.org/plugins/responsive-ad-shortcodes/