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<!DOCTYPE html> <html> <head> <style> .item3 { grid-column: auto / span 2; } .grid-container { display: grid; grid-template-columns: auto auto auto; grid-template-rows: auto auto; grid-auto-flow: row; grid-gap: 10px; background-color: #2196F3; padding: 10px; } .grid-container > div { background-color: rgba(255, 255, 255, 0.8); text-align: center; padding: 20px 0; font-size: 30px; } </style> </head> <body> <h1>Change the grid-auto-flow Property with JavaScript</h1> <p>Click the button to set the grid-auto-flow to "row dense":</p> <p><button onclick="myFunction()">Fill the hole</button></p> <div class="grid-container" id="myDIV"> <div class="item1">1</div> <div class="item2">2</div> <div class="item3">3</div> <div class="item4">4</div> </div> <script> function myFunction() { document.getElementById("myDIV").style.gridAutoFlow = "row dense"; } </script> </body> </html>