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<!DOCTYPE html> <html> <head> <style> #myDIV { background-color:lightblue; width: 100%; block-size: 30px; animation: mymove 5s infinite; } @keyframes mymove { 50% {block-size: 100px;} } </style> </head> <body> <h1>Animation of block-size</h1> <p>Gradually change the block-size property from 30px to 100px, and back to 30px:<p> <div id="myDIV"> This is my DIV element. </div> </body> </html>
