animation-direction

这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

概述

animation-direction CSS 属性指示动画是否反向播放，它通常在简写属性animation中设定

初始值normal
适用元素all elements, ::before and ::after pseudo-elements
是否是继承属性否
计算值as specified
Animation typediscrete

语法

Formal syntax:  <single-animation-direction>#
where 
<single-animation-direction> = normal | reverse | alternate | alternate-reverse


animation-direction: normal
animation-direction: reverse
animation-direction: alternate
animation-direction: alternate-reverse
animation-direction: normal, reverse
animation-direction: alternate, reverse, normal

值

normal
每个循环内动画向前循环，换言之，每个动画循环结束，动画重置到起点重新开始，这是默认属性。
alternate
动画交替反向运行，反向运行时，动画按步后退，同时，带时间功能的函数也反向，比如，ease-in 在反向时成为ease-out。计数取决于开始时是奇数迭代还是偶数迭代
reverse
反向运行动画，每周期结束动画由尾到头运行。
alternate-reverse
反向交替， 反向开始交替
动画第一次运行时是反向的，然后下一次是正向，后面依次循环。决定奇数次或偶数次的计数从1开始。

例子

See CSS animations for examples.

Specifications

Specification Status Comment
CSS Animations
animation-direction		 Working Draft For the two new values, see the W3C discussion.

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-directionChrome 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 4
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 3.2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Samsung Internet Android Full support 4.0
Full support 4.0
Full support 1.0
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
alternate-reverseChrome Full support 19Edge Full support 12Firefox Full support 16IE Full support 10Opera Full support 12.1Safari Full support 6WebView Android Full support ≤37Chrome Android Full support 25Firefox Android Full support 16Opera Android Full support 12.1Safari iOS Full support 6Samsung Internet Android Full support 1.5
reverseChrome Full support 19Edge Full support 12Firefox Full support 16IE Full support 10Opera Full support 12.1Safari Full support 6WebView Android Full support ≤37Chrome Android Full support 25Firefox Android Full support 16Opera Android Full support 12.1Safari iOS Full support 6Samsung Internet Android Full support 1.5

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.

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