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We have another cool new CSS feature to talk about: animation specified in CSS. There is a lot of ground to cover here, so we’ll start with the basics first. The simplest kind of animation that we’ve added support for is called a transition. Normally when the value of a CSS property changes, the rendered result is instantly updated, with the element in question changing immediately from the old property value to the new property value. Transitions describe how to instead execute an animation from the old state to the new state over time.