HTML5 YouTube Video Gallery greets users with four YouTube Video thumbnails with animated transitions. Users can select a thumbnail, and the chosen video appears with a back button and a call to action.DoubleClick studio Layouts makes rich media ad development much easier, so you can reinvest your time in more strategic projects. Layouts provides the rich media shell for you, so all you have to do is pick the layout you want, upload your existing assets, add your desired copy and publish. With Layouts, you can get more out of your existing assets, trade up from basic image ads to rich media, and even build HTML5 ads in minutes.