title: Items that span all columns/rows using CSS grid layout
body: <p>With the CSS Grid Layout Module soon shipping in Firefox and Chrome, I thought that I'd try to get a handle of how to use it.</p>
  
  <p>I've tried to create a simple grid with one item <code>a</code> spanning the left side of all of the rows, with the other items (<code>b</code>, <code>c</code>, <code>d</code>, <code>e</code>, etc.) spanning the right side of individual rows. The amount of items spanning the right side of the rows is variable, so there might be any combination of <code>b</code>, <code>c</code>, <code>d</code>, <code>e</code>, etc., so I'm using the <code>grid-auto-rows</code> property. As such, I cannot define a fixed number of rows for <code>a</code> to span, but I would like <code>a</code> to span <em>all</em> available rows.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>#container {
      display: grid;
      grid-auto-flow: column;
      grid-auto-rows: auto;
      grid-template-columns: [left] 4rem [right] 1fr;
      margin: 0rem auto;
      max-width: 32rem;
  }
  #a {
      background: lightgreen;
      grid-column: left;
      grid-row: 1 / auto;
      justify-self: center;
  }
  #b {
      grid-area: auto / right;
      background: yellow;
  }
  #c {
      grid-area: auto / right;
      background: pink;
  }
  #d {
      grid-area: auto / right;
      background: lightskyblue;
  }
  #e {
      background: plum;
      grid-area: auto / right;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="container"&gt;
      &lt;div id="a"&gt;a&lt;/div&gt;
      &lt;div id="b"&gt;b&lt;/div&gt;
      &lt;div id="c"&gt;c&lt;/div&gt;
      &lt;div id="d"&gt;d&lt;/div&gt;
      &lt;div id="e"&gt;e&lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>What should I do to make <code>a</code> span all rows without knowing how many rows there will end up being?</p>