代码片段：
@-webkit-keyframes warn{
0%{-webkit-transform:scale(0);transform:scale(0);opacity:1}
100%{-webkit-transform:scale(1);transform:scale(1);opacity:0}
}
@-moz-keyframes warn{
0%{-moz-transform:scale(0);transform:scale(0);opacity:1}
100%{-moz-transform:scale(1);transform:scale(1);opacity:0}
}
@-o-keyframes warn{
0%{-o-transform:scale(0);transform:scale(0);opacity:1}
100%{-o-transform:scale(1);transform:scale(1);opacity:0}
}
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