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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; border: 1px solid black; animation: mymove 5s infinite; } @keyframes mymove { 50% {border-bottom-left-radius: 150px;} } </style> </head> <body> <h1>Animation of border-bottom-left-radius</h1> <p>Gradually change the border-bottom-left-radius property from 0 to 150px, then back:<p> <div id="myDIV"></div> </body> </html>