Css Flex显示为行，两个项目显示为列

Question

是否可以将带有项目显示的flex元素设为行，但是2个项目显示为列？

我想像这样显示

    .nav{
        height: 44px;
        border: 1px solid #000;
        display: flex;
        flex-direction: row;
    }
    .item{
        text-decoration: none;
        border: 1px solid #000;
        width: 60px;
        text-align: center;
    }
    .item.inline{
        background: lightcoral;
        height: 20px;
    }

**HTML:**

    <div class="nav">
      <a href="#" class="item">1</a>
      <a href="#" class="item">2</a>
      <a href="#" class="item">3</a>
      <a href="#" class="item inline">4</a>
      <a href="#" class="item inline">5</a>
      <a href="#" class="item">6</a>
    </div>

Answer 1

包裹的列，看起来像一行：

.nav, .item {
  box-sizing: border-box;
  border: 1px solid #000;
}

.nav {
  display: flex;
  flex-flow: column wrap;
  align-content: flex-start;
  height: 44px;
}

.item {
  width: 60px;
  height: 100%;
  text-align: center;
  text-decoration: none;
}

.item.inline {
  background: lightcoral;
  height: 50%;
}

<div class="nav">
  <a href="#" class="item">1</a>
  <a href="#" class="item">2</a>
  <a href="#" class="item">3</a>
  <a href="#" class="item inline">4</a>
  <a href="#" class="item inline">5</a>
  <a href="#" class="item">6</a>
</div>