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<!DOCTYPE html> <html> <head> <style> #parentDIV { position: relative; height:300px; width: 60%; background-color:#FFFFFF; border: solid black 1px; } #myDIV { position: absolute; background-color:lightblue; width: 100%; inset-block: 30px 0; animation: mymove 5s infinite; } @keyframes mymove { 50% {inset-block-start: 100px;} } </style> </head> <body> <h1>Animation of inset-block-start</h1> <p>Gradually change the inset-block-start property from 30px to 100px, and back to 30px:<p> <div id="parentDIV"> <div id="myDIV"> This is my DIV element. </div> </div> </body> </html>