CSS

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CSS animations make it possible to animate transitions from one CSS style configuration to another. Animations consist of two components: a style describing the CSS animation and a set of keyframes that indicate the start and end states of the animation's style, as well as possible intermediate waypoints.
If the mismatch in the number of animations and animation property values is inverted, say there are five animation-duration values for three animation-name values, then the extra or unused animation property values, in this case, two animation-duration values, don't apply to any animation and are ignored. Building websites requires HTML, CSS, and JavaScript. To build websites and applications people want to use, which attract and retain users, you need to create a good user experience. Part of good user experience is ensuring the content is quick to load and responsive to user interaction. This is known as web performance, and in this module you'll focus on the fundamentals of how to create performant websites.

The CSS animation longhand properties can accept multiple values, separated by commas. This feature can be used when you want to apply multiple animations in a single rule and set different durations, iteration counts, etc., for each of the animations. Let's look at some quick examples to explain the different permutations.