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Animated banners are especially useful for small-screen displays where branding and images do not fit into the available space, e.g. mobile devices. For example, a banner can alternate between company name and logo, slogan, URL and photos.
Google's system dictates that a cycle of all frames in an animation must complete within 30 21 seconds, not counting the first (background) frame. Continued and infinite looping is permitted. Although Flash-based animations are permitted, they are best avoided due to their lack of support on mobile devices such as Ipads. The most widely supported animation method is therefore the old-fashioned GIF-based animation.
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