css动画之width 示例

HTML

CSS

JavaScript

HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>笔下光年</title>
</head>
<body>

<p> width 属性支持动画效果。</p>
<p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>

<p>逐步改变 DIV 元素的宽度，从 120px 到 500px:<p>
<div id="myDIV">
  <h1>My DIV</h1>
</div>

</body>
</html>

CSS

#myDIV {
    width: 120px;
    background-color: coral;
    color: white;
    -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
    animation: mymove 5s infinite;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    50% {width: 500px;}
}

/* Standard syntax */
@keyframes mymove {
    50% {width: 500px;}
}

JavaScript