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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; width: 400px; height: 100px; animation: mymove 5s infinite; } @keyframes mymove { 50% {font-weight: bold;} } </style> </head> <body> <h1>font-weight 动画</h1> <p>逐渐将字体粗细从正常更改为粗体，然后再恢复为正常：<p> <div id="myDIV"> <p>这是一个段落</p> </div> <p><b>注意：</b> CSS 动画在 Internet Explorer 9 和更早版本中不起作用。</p> </body> </html>