```html
<ui-grid class="demo-grid">
  <ui-grid-cell nested class="demo-parent-cell" columns="4">
    <ui-grid-cell class="demo-child-cell demo-cell" columns="4">
      <span>Child 4</span>
    </ui-grid-cell>
    <ui-grid-cell class="demo-child-cell demo-cell" columns="4">
      <span>Child 4</span>
    </ui-grid-cell>
    <ui-grid-cell class="demo-child-cell demo-cell" columns="4">
      <span>Child 4</span>
    </ui-grid-cell>
    <span>Parent 4</span>
  </ui-grid-cell>
  <ui-grid-cell class="demo-cell" columns="4">4</ui-grid-cell>
  <ui-grid-cell class="demo-cell" columns="4">4</ui-grid-cell>
</ui-grid>
```
