A computerized device implements an animation coding engine to analyze timeline data defining an animation sequence and generate a code package. The code package can represent the animation sequence using markup code that defines a rendered appearance of a plurality of frames and a structured data object also comprised in the code package and defining a parameter used by a scripting language in transitioning between frames. The markup code can also comprise a reference to a visual asset included within a frame. The code package further comprises a cascading style sheet defining an animation primitive as a style to be applied to the asset to reproduce one or more portions of the animation sequence without transitioning between frames.