html - CSS 网格和语义 HTML

Question

我正在学习 CSS 网格，在尝试布局并使用语义 html 的同时遇到了一些问题

https://codepen.io/oscarryz/pen/oNNBKyd

所以基本上我将网格设置为 3x3，左侧和右侧为空白，中间为内容

.grid-container {
  display: grid;
  grid-template-columns: 1fr 40em 1fr;
  grid-template-rows: 1fr 1fr 1fr;
  grid-template-areas:
    " . header . "
    " . content . "
    " . footer . ";
}

.header {
  grid-area: header;
}

.content {
  grid-area: content;
}

.footer {
  grid-area: footer;
}

.header, .content, .footer {
  border: 1px solid red;
}

<div class="grid-container">
  <header>
    <div class="header">header</div>
  </header>
  <main>
    <div class="content">content</div>
  </main>
  <footer>
    <div class="footer">footer</div>
  </footer>
</div>

从上面的代码笔中可以看出，这是行不通的。如果我remove the semantic tags it works ，显然必须有一个正确的方法来做到这一点

Answer 1

网格模板适用于直系后代。

语义元素应该通过标记名引用，而不是类:

/* changed from .header, which is a _child_ of header */
header {
  grid-area: header;
}

/* changed from .content, which is a _child_ of main */
main {
  grid-area: content;
}

/* changed from .footer, which is a _child_ of footer */
footer {
  grid-area: footer;
}

更正代码笔:https://codepen.io/c_bergh/pen/eYYvOmG