Detailed introduction to the animation-direction attribute in CSS3
CSS3 animation-direction property, CSS Reference Manual Example Execute the animation once, and then execute the animation in reverse. Retrieve or set whether the object animation moves in reverse direction in the loop
Example
Execute the animation once first, and then execute the animation in reverse:
!DOCTYPE html> <html> <head> <style>
p { width:100px; height:100px; background:red; position:relative; animation:myfirst 5s infinite; animation-direction:alternate;
/* Safari 和 Chrome */ -webkit-animation:myfirst 5s infinite; -webkit-animation-direction:alternate; }
@keyframes myfirst { 0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;}
50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;} }
@-webkit-keyframes myfirst /* Safari 和 Chrome */ { 0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;} 50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;} 100% {background:red; left:0px; top:0px;} }
</style> </head> <body> <p><strong>注意：</strong>Internet Explorer 9 及其之前的版本不支持 animation-direction 属性。</p> <p></p> </body> </html>Browser support
Internet Explorer 10, Firefox and Opera support the animation-direction attribute.
Safari and Chrome support an alternative property, the -webkit-animation-direction property.
Note: Internet Explorer 9 and earlier versions do not support the animation-direction property.
Definition and Usage
The animation-direction property defines whether to loop and alternately play the animation in reverse.
Note: This property will have no effect if the animation is set to play only once.
CSS syntax
animation-direction: normal|reverse|alternate|alternate-reverse|initial|inhe
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