# Subgrid

Status: Baseline 2023 (Chrome 117, Safari 16, Firefox 71); widely available.  
Source: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_grid_layout/Subgrid  
Page: https://designforai.dev/css/subgrid

A nested grid can adopt its parent's row or column tracks, so card titles, bodies and footers align across a row of cards even when content lengths differ.

## HTML

```html
<ul class="fx-005">
  <li><h3>Starter</h3><p>Short blurb.</p><a href="#">Choose</a></li>
  <li><h3>Team plan</h3><p>Much longer description that pushes the button down, but only here.</p><a href="#">Choose</a></li>
  <li><h3>Enterprise</h3><p>Medium copy.</p><a href="#">Choose</a></li>
</ul>
```

## CSS

```css
.fx-005 {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 16px;
  list-style: none;
  padding: 0;
  font-family: system-ui
}
.fx-005 li {
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 3;
  gap: 8px;
  padding: 16px;
  border: 1px solid #ddd;
  border-radius: 10px
}
.fx-005 a {
  align-self: end;
  justify-self: start;
  padding: 8px 14px;
  background: #111;
  color: #fff;
  border-radius: 6px;
  text-decoration: none
}
.fx-005 :is(a,button,input,select,textarea):focus-visible { outline: 2px solid currentColor; outline-offset: 2px; }
```

Fallback: Without subgrid each card lays out its own rows; buttons stop aligning but nothing overlaps.

## Prompt

Use CSS subgrid for aligned card rows: the list is a grid, each card sets `display:grid; grid-template-rows: subgrid; grid-row: span N` where N is the number of internal rows (title, body, action). Do not fix heights or use JS equal-height hacks; let subgrid align the tracks.