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SmilScript is a library intended for use by authors or publishers of SVG documents. SVG uses an extended subset of SMIL to achieve declarative (element-based, non-scripted) user interaction and animation events. This library is not intended to be used outside the context of SVG and its limited subset of SMIL, so it probabaly isn't appropriate for other SMIL content. It also will not work for Firefox builds that do not include the native SVG viewer (version 1.5 or later).