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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; transition: width 2s, height 4s; } div:hover { width: 300px; height: 300px; } </style> </head> <body> <h1>transition 属性</h1> <p>将鼠标悬停在下方的div元素上，可以看到过渡效果：</p> <div></div> <p><b>注意：</b>此示例不适用于 Internet Explorer 9 和更早版本。</p> </body> </html>