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<!DOCTYPE html> <html> <head> <style> #DIV1 { height: 200px; width: 200px; margin: auto; border: 1px solid black; } #DIV2 { height: 150px; border: 1px solid black; background-color: coral; aspect-ratio: 1; animation: mymove 5s infinite; } @keyframes mymove { 33% {aspect-ratio: 0.5;} 66% {aspect-ratio: 2;} } #DIV2original { position: absolute; z-index: -1; height: 150px; aspect-ratio: 1; border: 1px dashed grey; background-color: lightgrey; opacity: 0.5; } </style> </head> <body> <h1>Animation of aspect-ratio property</h1> <p>Gradually changes the aspect-ratio property from "1" to "0.5" to "2", and back:<p> <p><b>Note: </b>The grey DIV element indicates where the DIV2 element would be with "1" as value for aspect-ratio property.</p> <div id="DIV1">DIV1 <div id="DIV2original">DIV2</div> <div id="DIV2">DIV2</div> </div> </body> </html>
