CSS transition-timing-function

Specifies the speed of an elements transition effect over the course of its duration.

Syntax

transition-timing-function: <value>;

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The transition-timing-function can have one of the following values:

• ease: Default value, speeds up until the middle of the transition then slows back down at the end.
• linear: Same speed from start to end.
• ease-in: Starts off slowly then increasing speed until the transition is complete.
• ease-out: Starts off quickly then decreasing speed until the transition is complete.
• ease-in-out: Starts slowly, then speeds up, then ends slowly.
• steps(int, start|end): A stepping function that takes in two parameters. The first (required) parameter being the number of intervals or steps the transition effect takes to finish. The second parameter, which is optional, takes in either start or end. start will make value changes occur at the beginning of each interval while end will make the changes occur at the end of each interval. If no second parameter is specified, the default value will be end.
• step-start: Equal to steps(1, start).
• step-end: Equal to steps(1, end);
• cubic-bezier(p1, p2, p3, p4): An author defined curve/speed, where p1 through p3 must be between 0 to 1.

Note: The integer value for steps(int, start|end) must be greater then 0.

Make sure to declare a transition-duration property, otherwise the duration will be 0 and have no transitioning effect.

Example 1

Setting a p element with a transitioning effect speed of ease-in-out.

p {
  transition-timing-function: ease-in-out;
}

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Example 2

Setting a p element with a transitioning effect that takes 7 intervals to complete and changes values at the beginning of each interval.

div {
  transition-timing-function: steps(7, start);
}

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Example 3

Defining a custom speed for a p elements transition effect.

p {
  transition-timing-function: cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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