CSS transition-timing-function Property


The transition-timing-function property is used to describe how the intermediate values of the CSS properties being affected by a transition effect are calculated. This in essence lets you establish an acceleration curve, so that the speed of the transition can vary over its duration.

Initial value
Applies to
All elements, :before and :after pseudo elements
Computed value
Same as specified value
CSS Version
JavaScript syntax


transition-timing-function: <single-transition-timing-function> [ ',' <single-transition-timing-function> ]*


<single-transition-timing-function> = ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(<integer>[, [ start | end ] ]?) | cubic-bezier(<number>, <number>, <number>, <number>)
  • easeThe ease function is equivalent to cubic-bezier(0.25, 0.1, 0.25, 1).
  • linearThe linear function is equivalent to cubic-bezier(0, 0, 1, 1).
  • ease-inThe ease-in function is equivalent to cubic-bezier(0.42, 0, 1, 1).
  • ease-outThe ease-out function is equivalent to cubic-bezier(0, 0, 0.58, 1).
  • ease-in-outThe ease-in-out function is equivalent to cubic-bezier(0.42, 0, 0.58, 1)
  • step-startThe step-start function is equivalent to steps(1, start).
  • step-endThe step-end function is equivalent to steps(1, end).
  • steps(<integer>[, [ start | end ] ]?) Specifies a stepping function, described above, taking two parameters. The first parameter specifies the number of intervals in the function. It must be a positive integer (greater than 0). The second parameter, which is optional, is either the value 'start' or 'end', and specifies the point at which the change of values occur within the interval. If the second parameter is omitted, it is given the value 'end'.
  • cubic-bezier(<number>, <number>, <number>, <number>)Specifies a cubic-bezier curve. The four values specify points P1 and P2 of the curve as (x1, y1, x2, y2). Both x values must be in the range [0, 1] or the definition is invalid. The y values can exceed this range.


<div class="test"> ease </div> 
<div class="test2"> linear </div>
<div class="test3"> ease-in </div>
<div class="test4"> ease-out </div>
<div class="test5"> ease-in-out </div>
<div class="test6" > cubic-bezier </div>
div {
   transition-duration: 1s;
   width: 100px;
   height: 60px; 
   background-color: khaki; 
   display: inline-block; 
   border: 2px solid orange;
   margin-bottom: 13px; 
div:hover {
   height: 250px; 
   background-color: moccasin; 
.test { 
   transition-timing-function: ease;  
.test2 { 
   transition-timing-function: linear;  
.test3 { 
   transition-timing-function: ease-in;  
 .test4 { 
   transition-timing-function: ease-out;  
.test5 { 
   transition-timing-function: ease-in-out;  
.test6 { 
   transition-timing-function: cubic-bezier (0.5,0.05,0.7,0.5);   

Browser Support

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Tablets / Mobile
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Last updated by CSSPortal on: 2nd November 2019