代码示例：（标识：cssref_grid-auto-flow_2）
<!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-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>grid-auto-flow 属性</h1>
<p><em>grid-auto-flow</em> 属性控制如何在网格中插入自动放置的项目。</p>
<p>这个网格有三列两行。</p>
<p>"item3" 横跨两列，那其他项目在哪里呢？</p>
<h2>grid-auto-flow: row</h2>
<div class="grid-container" style="grid-auto-flow: row;">
<div class="item1">1</div>
<div class="item2">2</div>
<div class="item3">3</div>
<div class="item4">4</div>
</div>
<h2>grid-auto-flow: row dense</h2>
<p>"dense" 值会填充网格中的孔：</p>
<div class="grid-container" style="grid-auto-flow: row dense;">
<div class="item1">1</div>
<div class="item2">2</div>
<div class="item3">3</div>
<div class="item4">4</div>
</div>
</body>
</html>
