animation-fill-mode

CSS 属性 animation-fill-mode 设置CSS动画在执行之前和之后如何将样式应用于其目标。

使用简写属性 animation 一次性设置所有动画属性通常很方便。

语法

/* Single animation */
animation-fill-mode: none;
animation-fill-mode: forwards;
animation-fill-mode: backwards;
animation-fill-mode: both;

/* Multiple animations */
animation-fill-mode: none, backwards;
animation-fill-mode: both, forwards, none;

none
当动画未执行时,动画将不会将任何样式应用于目标,而是已经赋予给该元素的 CSS 规则来显示该元素。这是默认值。
forwards
目标将保留由执行期间遇到的最后一个关键帧计算值。 最后一个关键帧取决于animation-directionanimation-iteration-count的值:
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
backwards
动画将在应用于目标时立即应用第一个关键帧中定义的值,并在animation-delay期间保留此值。 第一个关键帧取决于animation-direction的值:
animation-direction first relevant keyframe
normal or alternate 0% or from
reverse or alternate-reverse 100% or to
both
动画将遵循forwardsbackwards的规则,从而在两个方向上扩展动画属性。

注意:当您在animation-*属性上指定多个以逗号分隔的值时,它们将根据值的数量以不同的方式分配给 animation-name 属性中指定的动画。 有关更多信息,请参阅设置多个动画属性值

正式语法

<single-animation-fill-mode>#

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

示例

您可以在以下示例中看到 animation-fill-mode 的效果。 它演示了如何对于运行无限时间的动画,可以使其保持最终状态而不是恢复到原始状态(这是默认状态)。

HTML

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

CSS

.demo {
  border-top: 100px solid #ccc;
  height: 300px;
}

@keyframes grow {
  0% { font-size: 0; }
  100% { font-size: 40px; }
}

.demo:hover .grows {
  animation-name: grow;
  animation-duration: 3s;
}

.demo:hover .growsandstays {
  animation-name: grow;
  animation-duration: 3s;
  animation-fill-mode: forwards;
}

更多示例请查看 CSS 动画

规范

Specification Status Comment
CSS Animations
animation-fill-mode
Working Draft Initial definition.
初始值none
适用元素all elements, ::before and ::after pseudo-elements
是否是继承属性
适用媒体visual
计算值as specified
Animation typediscrete
正规顺序the unique non-ambiguous order defined by the formal grammar

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
animation-fill-modeChrome Full support 43
Full support 43
Full support 3
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge Full support 12
Full support 12
Full support 12
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Firefox Full support 16
Full support 16
Full support 49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Full support 44
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 44: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Full support 5
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
IE Full support 10Opera Full support 30
Full support 30
Full support 15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
No support 12.1 — 15
No support 12 — 15
Prefixed
Prefixed Implemented with the vendor prefix: -o-
Safari Full support 9
Full support 9
Full support 5
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
WebView Android Full support 43
Full support 43
Full support ≤37
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Chrome Android Full support 43
Full support 43
Full support 18
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Firefox Android Full support 16
Full support 16
Full support 49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Full support 44
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 44: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Full support 5
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
Opera Android Full support 30
Full support 30
Full support 14
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
No support 12.1 — 14
No support 12 — 14
Prefixed
Prefixed Implemented with the vendor prefix: -o-
Safari iOS Full support 9
Full support 9
Full support 4
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Samsung Internet Android Full support 4.0
Full support 4.0
Full support Yes
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-

Legend

Full support  
Full support
User must explicitly enable this feature.
User must explicitly enable this feature.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

另见