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<!DOCTYPE html> <html> <head> <style> #DIV1 { height: 200px; width: 200px; margin: auto; border: 1px solid black; position: relative; } #DIV2 { width: 150px; border: 1px solid black; background-color: coral; aspect-ratio: 1; } #DIV2original { position: absolute; z-index: -1; opacity: 0.5; width: 150px; border: 1px dashed grey; background-color: lightgrey; aspect-ratio: 1; } </style> </head> <body> <h1>Change aspect-ratio property with JavaScript</h1> <p>Click the "Try it" button to set new aspect-ratio property "16/9":</p> <p><b>Note: </b>The grey DIV element indicates original aspect-ratio of DIV2 element.</p> <button onclick="myFunction()">Try it</button> <div id="DIV1">DIV1 <div id="DIV2original">DIV2</div> <div id="DIV2">DIV2</div> </div> <script> function myFunction() { document.getElementById("DIV2").style.aspectRatio = "16/9"; } </script> </body> </html>