transition-duration

The transition-duration CSS property sets the length of time a transition animation should take to complete. By default, the value is 0s, meaning that no animation will occur.

You may specify multiple durations; each duration will be applied to the corresponding property as specified by the transition-property property, which acts as a master list. If the number of specified durations is less than in the master list, the user agent repeats the list of durations. If the number of specified durations is more than in the master list, the list is truncated to the right size. In both the cases, the CSS declaration stays valid.

Syntax

/* <time> values */
transition-duration: 6s;
transition-duration: 120ms;
transition-duration: 1s, 15s;
transition-duration: 10s, 30s, 230ms;

/* Global values */
transition-duration: inherit;
transition-duration: initial;
transition-duration: revert;
transition-duration: revert-layer;
transition-duration: unset;

Values

<time>: Is a <time> denoting the amount of time the transition from the old value of a property to the new value should take. A time of 0s indicates that no transition will happen, that is the switch between the two states will be instantaneous. A negative value for the time renders the declaration invalid.

Formal definition

Initial value	0s
Applies to	all elements
Inherited	no
Computed value	list, each item a duration
Animation type	not animatable

Formal syntax

<time [0s,∞]>#

Examples

Example showing different durations

HTML

<div class="box duration-1">0.5 seconds</div>

<div class="box duration-2">2 seconds</div>

<div class="box duration-3">4 seconds</div>

<button id="change">Change</button>

CSS

.box {
  margin: 20px;
  padding: 10px;
  display: inline-block;
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 18px;
  transition-property: background-color font-size transform color;
  transition-timing-function: ease-in-out;
}

.transformed-state {
  transform: rotate(270deg);
  background-color: blue;
  color: yellow;
  font-size: 12px;
  transition-property: background-color font-size transform color;
  transition-timing-function: ease-in-out;
}

.duration-1 {
  transition-duration: 0.5s;
}

.duration-2 {
  transition-duration: 2s;
}

.duration-3 {
  transition-duration: 4s;
}

JavaScript

function change() {
  const elements = document.querySelectorAll("div.box");
  for (const element of elements) {
    element.classList.toggle("transformed-state");
  }
}

const changeButton = document.querySelector("#change");
changeButton.addEventListener("click", change);

css properties transition-duration