animation-fill-mode

版本: CSS3

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。

示例

/* 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;

浏览器支持

IE浏览器 火狐浏览器 opera浏览器 chrome浏览器 safari浏览器
IE10以上版本的浏览器都支持 animation-fill-mode

语法

animation-fill-mode : none | forwards | backwards | both

取值

  • 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-direction animation-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 forwards backwards 的规则,从而在两个方向上扩展动画属性。
默认值 none
适用于 所有元素,包含伪对象 ::before and ::after
继承性
动画性
计算值 指定值
媒体 视觉<

实例

//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;
}
<style type="text/css">
div{
	width:100px;
	height:100px;
	position:relative;
	background-color:hsl(120,65%,75%);
	animation:demo 5s infinite;
	-webkit-animation:demo 5s;
	animation-fill-mode:forwards;
	-webkit-animation-fill-mode:forwards;/*safari和chrome*/
	}
@keyframes demo
{
	from{left:0px;}
	to{left:350px;opacity:0.5;}
}
/*safari和chrome*/
@-webkit-keyframes demo
{
	from{left:0px;}
	to{left:350px;opacity:0.5;}
}
</style>
</head>
<body>
	<div></div>	
</body>

效果图: