Adsense team bring interactive to adsense ads with the introduction of new new ad type – Expandable Ads. It is the type of ad that will expanding, whenever there is interaction from site visitors. Among possibly rich content available on this ad, are such as videos, clips and etc.
If you familiar with Vibrant Media’s intellitext (althought it is in-text advertising), you can imagine similar interactive medias being streamed right inside the ads to the interesed visitors.
Back to the the ad, so do you think your site will potentially displaying this ad type? All publishers regardless the regions are eligible, provided Adsense ads codes are installed directly in your site page, and you have enable image ads. In term of advertisier, the expandable ads are currently only available to specific advertisers located in the U.S
Just like other Adsense ad type, publishers are earns an icnome based on CPM and CPC model. Earning only counted when visitors visit the landing page and not just by clicking on the ad with intention to expand the ad.
No modification required for your site in order to be able to display this type of.