Google has been constantly adding new features to AdSense, offering publishers more control over how ads are displayed on their website. Here are some features related to ad code implementation that rolled out during the past 12 months:
- Introduction of Asynchronous Ads — July 2013
- Introduction of Responsive Ads — July 2013
- Introduction of Custom-Sized Ads — December 2013
At this moment, publishers can choose from standard, responsive and custom-sized ad units when creating one. If you have not chosen the ad code implementation method or you are looking forward to change it, I suggest going for responsive ads.