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<!DOCTYPE html> <html> <head> <style> #main { width: 250px; height: 100px; border: 1px solid #c3c3c3; display: flex; } #main div { flex-grow: 0; flex-shrink: 0; flex-basis: 50px; } #myBlueDiv { animation: mymove 5s infinite; } @keyframes mymove { 50% {flex-basis: 200px;} } </style> </head> <body> <h1>flex-basis 的动画效果：</h1> <p>Gradually change the flex-basis property of the BLUE div from 50px to 200px, and back:<p> <div id="main"> <div style="background-color:coral;">RED</div> <div style="background-color:lightblue;" id="myBlueDiv">BLUE</div> </div> <p><b>注释：</b>CSS 动画在 Internet Explorer 9 以及更早版本中不起作用。</p> </body> </html>