<html><head><meta charset="utf-8"> <title>手册网(www.shouce.ren)</title> <style> #myDIV { margin: auto; border: 1px solid black; outline: coral solid 5px; width: 300px; height: 300px; animation: mymove 5s infinite; /* Chrome, Safari, Opera */ animation: mymove 5s infinite;}/* Chrome, Safari, Opera */@-webkit-keyframes mymove { 50% {outline-width: 50px;}}/* Standard syntax */@keyframes mymove { 50% {outline-width: 50px;}}</style></head><body><p>逐步改变 outline-width 属性，从 5px 到 50px：<p><div id="myDIV"></div><p>outline-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></body></html>