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<html><head><style>.item1 { grid-area: 1 / 1 / 2 / 2; }.item2 { grid-area: 1 / 2 / 2 / 3; }.item3 { grid-area: 1 / 3 / 2 / 4; }.item4 { grid-area: 2 / 1 / 3 / 2; }.item5 { grid-area: 2 / 2 / 3 / 3; }.item6 { grid-area: 2 / 3 / 3 / 4; }.grid-container { display: grid; grid-auto-rows: 150px; 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-rows Property with JavaScript</h1><p>Click the button to set the default size of the rows:</p><p><button onclick="myFunction()">Change row size</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 class="item5">5</div> <div class="item6">6</div></div><script>function myFunction() { document.getElementById("myDIV").style.gridAutoRows = "60px";}</script>