Published: September 28, 2023
> [!TIP]
> **Celebration:** This web feature is now available in all three major browser engines, and becomes **Baseline Newly available** as of September 15, 2023.
[CSS grid](https://web.dev/learn/css/grid.md.txt) is a very powerful layout engine, but the row and
column tracks created on a parent grid can only be used to position direct
children of the grid container. Any author defined [named grid areas and
lines](https://web.dev/learn/css/grid#named-grid-lines) were lost on any other element than a
direct child. With `subgrid`, track sizing, templates and names can be shared
with nested grids. This article explains how it works.
> [!TIP]
> Special thanks to Microsoft Edge's Web Platform
> engineers for their contribution of subgrid to Chromium! This CSS feature was
> made available thanks to their great work: Alison Maher, Ethan Jimenez, Kurt
> Catti-Schmidt, Ana Sollano Kim and Daniel Libby. An additional special thanks to
> Ian Kilpatrick from the Google Chromium team for helping this land as well.
> Shout outs and kudos all around!
**Before** subgrid, content was often hand tailored to avoid ragged layouts like
this one.
**After** subgrid, aligning the variably sized content is possible.
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/CSS/Guides/Grid_layout/Subgrid)
## Subgrid basics
Here is a straightforward use case introducing the basics of CSS `subgrid`. A
grid is defined with two named columns, the first is `20ch` wide and the second
is "the rest" of the space `1fr`. The column names aren't required but they're
great for illustrative and educational purposes.
```css
.grid {
display: grid;
gap: 1rem;
grid-template-columns: [column-1] 20ch [column-2] 1fr;
}
```
Then, a child of that grid, spans those two columns, is set as a grid container,
and adopts the columns of its parent by setting `grid-template-columns` to
`subgrid`.
```css
.grid > .subgrid {
grid-column: span 2;
display: grid;
grid-template-columns: subgrid; /* 20ch 1fr */
}
```
That's it, a parent grid's columns have been effectively passed down a level to
a subgrid. This subgrid can now assign children to either of those columns.
**Challenge!** Repeat the same demo but do it for `grid-template-rows`.
## Share a page level "macro" grid
Designers often work with shared grids, drawing lines over an entire design,
aligning any element they want to it. Now web developers can too! This exact
workflow can now be achieved, plus many more.
From macro grid to finished design. Grid named areas are created upfront and later components are placed as desired.
Implementing the most common designer grid workflow can provide excellent
insights into the capabilities, workflows, and potentials of `subgrid`.
Here's a screenshot taken from Chrome DevTools of a mobile page layout macro
grid. The lines have names and there are clear areas for component placement.
The following CSS creates this grid, with named rows and columns for the device
layout. Each row and column has a size.
```css
.device {
display: grid;
grid-template-rows:
[system-status] 3.5rem
[primary-nav] 3rem
[primary-header] 4rem
[main] auto
[footer] 4rem
[system-gestures] 2rem
;
grid-template-columns: [fullbleed-start] 1rem [main-start] auto [main-end] 1rem [fullbleed-end];
}
```
Some additional styles give the following design.
Inside this parent, are various nested elements. The design requires a full
width image under the nav and header rows. The furthest left and right column
line names are `fullbleed-start` and `fullbleed-end`. Naming grid lines this way
enables children to align to each simultaneously with the [placement
shorthand](https://rachelandrew.co.uk/archives/2017/06/01/breaking-out-with-css-grid-explained/)
of `fullbleed`. It's very convenient as you'll soon see.
With the overall device layout created with nice named rows and columns, use
`subgrid` to pass the well named rows and columns to nested grid layouts. This
is that `subgrid` magic moment. The device layout passes the named rows and
columns to the app container, which then passes it on to every one of its
children.
```css
.device > .app,
.app > * {
display: grid;
grid: subgrid / subgrid;
/* same as */
grid-template-rows: subgrid;
grid-template-columns: subgrid;
}
```
**CSS subgrid is a value used in place of a list of grid tracks.** The rows and
columns the element is spanning from its parent, are now the same rows and
columns it offers. This makes the line names from the `.device` grid available
to children of `.app`, instead of only `.app`. Elements inside of `.app` were
not able to reference the grid tracks created by `.device` before subgrid.
`display: grid` is required on every element that wishes to
subscribe or pass on rows and columns.
With this all defined, the nested image is now able to go full bleed in the
layout thanks to `subgrid`. No negative values or tricks, instead a nice
one-liner that says "my layout spans from `fullbleed-start` to `fullbleed-end`."
```css
.app > main img {
grid-area: fullbleed;
}
```
There you have it, a macro grid like designers use, implemented in CSS. This
concept can scale and grow with you as needed.
## Check for support
Progressive enhancement with CSS and subgrid is familiar and straightforward.
Use `@supports` and inside the parenthesis ask the browser if it understands
subgrid as a value for template columns or rows. The following example checks if
the `grid-template-columns` property supports the `subgrid` keyword, which if
true, means that subgrid can be used
```css
@supports (grid-template-columns: subgrid) {
/* safe to enhance to */
}
```
## Devtools
Chrome, Edge, Firefox and Safari all have great CSS grid DevTools, and Chrome,
Edge and Firefox have specific tools for helping with subgrid. [Chrome announced
their tools in
115](https://developer.chrome.com/blog/new-in-devtools-115#subgrid) while
Firefox has had them for a year or more.
The subgrid badge acts like the grid badge but visually distinguishes which
grids are subgrids and which aren't.
## Resources
This list is a compilation of subgrid articles, demos and overall inspiration
for getting started. If you're looking for the next step for your subgrid
education, have fun exploring all these great resources!
- [MDN](https://developer.mozilla.org/docs/Web/CSS/CSS_grid_layout/Subgrid)
- [Rachel Andrew with aligned captions](https://codepen.io/rachelandrew/pen/VVGZVW)
- [Rachel Andrew with 10 great examples](https://12daysofweb.dev/2022/css-subgrid/)
- [Rachel Andrew with a site of examples](https://gridbyexample.com/examples/#css-grid-level-2-examples)
- [Ahmad Shadeed article](https://ishadeed.com/article/learn-css-subgrid/)
- [Michelle Barker at CSS Day 2022](https://youtu.be/tueTFd2TQUA?t=2266)
- Cards
- [Codepen by Jhey](https://codepen.io/jh3y/pen/abKaYqO)
- [Codepen by Ahmad Shadeed](https://codepen.io/shadeed/pen/qBpQNQY)
- [Codepen by Takeshi Kano](https://codepen.io/tonkotsuboy/pen/LYexpZp)
- [Codepen by Arvid](https://codepen.io/ArvidW/pen/rNrGjvW)
- [Codepen by Chris Coyier](https://codepen.io/chriscoyier/pen/bGRXmEe)
- [Codepen by Miriam
Suzanne](https://codepen.io/miriamsuzanne/pen/xxKRpmq)
- [Chris Coyier with forms](https://codepen.io/chriscoyier/pen/YzxqJap)
- [Facundo Corradini with form alignment](https://codepen.io/facundocorradini/pen/wvBBpJM)
- [Chris Coyier with aligning list item markers](https://codepen.io/chriscoyier/pen/mdemZaw)
- [Michelle Barker popping out of container to align with parent grid](https://codepen.io/michellebarker/pen/wvyBjOz)
- [Miriam Suzanne showing named line names and subgrid interactions](https://codepen.io/miriamsuzanne/pen/ZEEbxro)
- [Kevin Powell with named area basics](https://codepen.io/kevinpowell/pen/RwgvMMb)
- [Kevin Powell with aligned lists](https://codepen.io/kevinpowell/pen/XWgoWRx)
- [Shannon Moeller with aligned lists](https://codepen.io/shannonmoeller/pen/poLQLoO)
- [Kevin Powell with a page level grid passed down to components](https://codepen.io/kevinpowell/pen/LYVmpqY)
- [Elad Shechter with a devtool overlay and fallback](https://codepen.io/elad2412/pen/KKaXOPG)
- [Aaron Iker with a nice typographic use of subgrid for baseline alignment of
footnotes](https://codepen.io/aaroniker/pen/OeyayK)
- [Adam Argyle with a fullbleed image inside an article](https://codepen.io/argyleink/pen/ExbzqWp)