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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; background-color: lightgreen; border-block-end: 10px solid blue; animation: mymove 5s infinite; } @keyframes mymove { 50% {border-block-end: 15px dotted pink;} } </style> </head> <body> <h1>Animation of border-block-end</h1> <p>Gradually change the border-block-end property from 10px solid blue to 15px dotted pink, then back:<p> <div id="myDIV"></div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>