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