Animated Gif Google Ads. HTML5 ads can be more complicated complete with more animations and colours at a smaller size than a GIF displaying the exact same content. It can loop endlessly or it can show a few images and then stop on a point that you feel will get across the point of your business best.
For example a spinning top numbers that grow or shrink or an interchange between two images. Its now testing animated GIF ads with a small test group of advertisers a move that may give Google placements more branding value. HTML5 ads also allow for more eye-catching advertisements very similar to the freedom that Flash used to allow.
This sort of plug and play format ads.
This ad is a half page ad 300x6. With only 256 supported colours GIFs have a more limited colour palette than HTML5 ads. Animated GIF display ads specifications. Animations can be looped but must stop after 30 seconds.