——CSS3动画库
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animation: name duration timing-function delay iteration-count direction;
animation: fadeInUpBig 1.2s linear .2s 1 normal;
<div id="b5-1"></div>
#b5-1{ animation: slideInDown 1s ease .2s 5 alternate; -webkit-animation: slideInDown 1s ease .2s 5 alternate; -ms-animation: slideInDown 1s ease .2s 5 alternate; -o-animation: slideInDown 1s ease .2s 5 alternate; -moz-animation: slideInDown 1s ease .2s 5 alternate; }