The transition property allows you to change property values smoothly over a given duration. This controls the speed when changing CSS properties, instead of having changes happen instantly.

The Transition Properties

• transition-property: Specifies the name of the CSS property the transition effect is for (e.g., width, background-color).
• transition-duration: Specifies how many seconds or milliseconds the transition effect takes to complete.
• transition-timing-function: Specifies the speed curve of the transition effect (e.g., linear, ease-in).
• transition-delay: Defines a delay (in seconds) for the transition effect start.

Timing Functions Explained

The flow of time isn't always linear. With ease-in, an animation starts slow and speeds up. With ease-out, it starts fast and slows down at the end. These make interfaces feel more natural and organic.

Performance Note

For the smoothest animations (60fps), try to stick to transitioning transform and opacity. Transitioning properties like height or margin can cause layout thrashing and stuttering.