On Wednesday, June 22, 2016 Google launched AdSense Labs to give publishers access to test newer features, Google team added a new subtab under the Optimization tab, where you’ll find new experimental features you are eligible to test.
The first two Labs we’ll be launching are “Show fewer ads” and “Inline ads.”
Show fewer ads
Show fewer ads cuts down the number of ads that are shown to your users in exchange for a negligible drop in your revenue. It aims to remove at least 10% of the ads served on your site (1% or less of your revenue), by preventing low value ads from being shown to your users.
Inline ads sized 320×100 ad units which are dynamically inserted within your mobile website. Inline ads appear as users scroll down a page and With this new ad format you’ll no longer need to write the logic to dynamically insert ad units on your page, Google team handle all that for you.