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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 
 
<style> 
#myDIV {
    background-color: lightblue;
    overflow: auto;
    border: 1px solid black;
    -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
    animation: mymove 5s infinite;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    50% {max-width: 600px;}
}

/* Standard syntax */
@keyframes mymove {
    50% {max-width: 600px;}
}
</style>
<p>逐步改变 max-width, 从 "none" 到 "600px":<p>

<div id="myDIV">
  <p>This DIV element does not have a pre-defined width.</p>
  <p>Try resizing the browser window to see that width of this DIV element will grow/shrink along width the resizing, but it will never exceed 600 pixels in width.</p>
</div>

<p>max-width 属性支持动画效果。</p>
<p><b>注意:</b> 目前 max-height 属性在 Chrome 浏览器下不会改变 <em>gradually（灰阶）</em>, 在 Firefox 都无法起作用。</p>
<p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>

代码编辑器：

运行结果：