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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 21 seconds, not counting the first (background) frame. Continued and infinite looping is permittedbut stops at the last cycle completed within 21 seconds. 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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