我有一个div标签覆盖了一个图像，该图像通过增加宽度和增加不透明度来进行动画处理。我只想要一次迭代（我知道这是默认值），但无论出于何种原因，它都会无限运行。我能得到一些关于如何完成单次迭代的反馈吗？先感谢您！
标记：
<div class="capback">
</div>
CSS：
.capback {
background: #000;
opacity:0.7;
filter:alpha(opacity=40);
position: absolute;
height: 17px;
width: 465px;
top: 1px;
left: 1px;
color: #fff;
padding: 5 0 0 10px;
font-size: 12px;
-moz-animation: fullexpand 25s ease-out;
-moz-animation-iteration-count:1;
-webkit-animation: fullexpand 25s ease-out;
-webkit-animation-iteration-count:1;
-o-animation: fullexpand 25s ease-out;
-o-animation-iteration-count:1;
}
@-moz-keyframes fullexpand {
0%, 20%, 40%, 60%, 80%, 100% { width:0%; opacity:0; }
4%, 24%, 44%, 64%, 84% { width:0%; opacity:0.3; }
16%, 36%, 56%, 76%, 96% { width:465px; opacity:0.7; }
17%, 37%, 57%, 77%, 97% { width:465px; opacity:0.3; }
18%, 38%, 58%, 78%, 98% { width:465px; opacity:0; }
}
@-webkit-keyframes fullexpand {
0%, 20%, 40%, 60%, 80%, 100% { width:0%; opacity:0; }
4%, 24%, 44%, 64%, 84% { width:0%; opacity:0.3; }
16%, 36%, 56%, 76%, 96% { width:465px; opacity:0.7; }
17%, 37%, 57%, 77%, 97% { width:465px; opacity:0.3; }
18%, 38%, 58%, 78%, 98% { width:465px; opacity:0; }
}
@-o-keyframes fullexpand {
0%, 20%, 40%, 60%, 80%, 100% { width:0%; opacity:0; }
4%, 24%, 44%, 64%, 84% { width:0%; opacity:0.3; }
16%, 36%, 56%, 76%, 96% { width:465px; opacity:0.7; }
17%, 37%, 57%, 77%, 97% { width:465px; opacity:0.3; }
18%, 38%, 58%, 78%, 98% { width:465px; opacity:0; }
}