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<!DOCTYPE html> <html> <head> <style> #myDIV { position: absolute; top: 200px; width: 300px; height: 150px; background-color: lightblue; border: 1px solid black; animation: mymove 5s infinite; } #DIV2 { position: absolute; top: 180px; left: 30px; width: 300px; height: 150px; background-color: coral; border: 1px solid black; } @keyframes mymove { 50% {opacity: 0;} } </style> </head> <body> <h1>不透明度的动画</h1> <p>opacity 属性在 CSS 中是<em>动画</em>。</p> <p><b>注意：</b>CSS 动画在 Internet Explorer 9 和更早版本中不起作用。</p> <p>将蓝色 DIV 元素的不透明度从 1 更改为 0，然后再更改回 1：<p> <div id="DIV2"> <h1>Voila!</h1> </div> <div id="myDIV"> </div> </body> </html>