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    This is an experimental technology
    Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.


    The animation-fill-mode CSS property specifies how a CSS animation should apply styles to its target before and after it is executing.


    animation-fill-mode: none;
    animation-fill-mode: forwards;
    animation-fill-mode: backwards;
    animation-fill-mode: both;
    /* Several values may be given, separated by commas. */
    /* Each applies for each animation in animation-name. */
    animation-fill-mode: none, backwards;
    animation-fill-mode: both, forwards, none;


    The animation will not apply any styles to the target before or after it is executing.
    The target will retain the computed values set by the last keyframe encountered during execution. The last keyframe encountered depends on the value of animation-direction and animation-iteration-count:
    animation-direction animation-iteration-count last keyframe encountered
    normal even or odd 100% or to
    reverse even or odd 0% or from
    alternate even 0% or from
    alternate odd 100% or to
    alternate-reverse even 100% or to
    alternate-reverse odd 0% or from
    The animation will apply the values defined in the first relevant keyframe as soon as it is applied to the target, and retain this during the animation-delay period. The first relevant keyframe depends of the value of animation-direction:
    animation-direction first relevant keyframe
    normal or alternate 0% or from
    reverse or alternate-reverse 100% or to
    The animation will follow the rules for both forwards and backwards, thus extending the animation properties in both directions.

    Formal syntax


    <single-animation-fill-mode> = none | forwards | backwards | both


    You can see the effect of animation-fill-mode in the following example. For animations that run for an infinite time, you might want them to end on the last state rather than the first.

    HTML content

    <p>Move your mouse over the grey box</p>
    <div class="demo">
      <div class="grows">This just grows</div>
      <div class="growsandstays">This grows and stays big</div>

    CSS content

    .demo {
      border-top: 100px solid #ccc;
      height: 300px;
      font-family: sans-serif;
    @keyframes grow {
        0% { font-size: 0 }
        100% { font-size: 40px }
    @-webkit-keyframes grow {
        0% { font-size: 0 }
        100% { font-size: 40px }
    .demo:hover .grows {
        animation-name: grow;
        animation-duration: 3s;
        -webkit-animation-name: grow;
        -webkit-animation-duration: 3s;
    .demo:hover .growsandstays {
        animation-name: grow;
        animation-duration: 3s;
        animation-fill-mode: forwards;
        -webkit-animation-name: grow;
        -webkit-animation-duration: 3s;
        -webkit-animation-fill-mode: forwards;


    Specification Status Comment
    CSS Animations
    The definition of 'animation-fill-mode' in that specification.
    Working Draft Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support (Yes)-webkit
    5.0 (5.0)-moz
    16.0 (16.0)
    10 12-o

    See also