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grid-auto-columns

The grid-auto-columns CSS property specifies the size of an implicitly-created grid column track or pattern of tracks.

If a grid item is positioned into a column that is not explicitly sized by grid-template-columns, implicit grid tracks are created to hold it. This can happen either by explicitly positioning into a column that is out of range, or by the auto-placement algorithm creating additional columns.

Syntax

/* Keyword values */
grid-auto-columns: min-content;
grid-auto-columns: max-content;
grid-auto-columns: auto;

/* <length> values */
grid-auto-columns: 100px;
grid-auto-columns: 20cm;
grid-auto-columns: 50vmax;

/* <percentage> values */
grid-auto-columns: 10%;
grid-auto-columns: 33.3%;

/* <flex> values */
grid-auto-columns: 0.5fr;
grid-auto-columns: 3fr;

/* minmax() values */
grid-auto-columns: minmax(100px, auto);
grid-auto-columns: minmax(max-content, 2fr);
grid-auto-columns: minmax(20%, 80vmax);

/* fit-content() values */
grid-auto-columns: fit-content(400px);
grid-auto-columns: fit-content(5cm);
grid-auto-columns: fit-content(20%);

/* multiple track-size values */
grid-auto-columns: min-content max-content auto;
grid-auto-columns: 100px 150px 390px;
grid-auto-columns: 10% 33.3%;
grid-auto-columns: 0.5fr 3fr 1fr;
grid-auto-columns: minmax(100px, auto) minmax(max-content, 2fr) minmax(20%, 80vmax);
grid-auto-columns: 100px minmax(100px, auto) 10% 0.5fr fit-content(400px);

/* Global values */
grid-auto-columns: inherit;
grid-auto-columns: initial;
grid-auto-columns: unset;

Values

<length>
Is a non-negative length.
<percentage>
Is a non-negative <percentage> value relative to the block size of the grid container. If the block size of the grid container is indefinite, the percentage value is treated like auto.
<flex>
Is a non-negative dimension with the unit fr specifying the track’s flex factor. Each <flex>-sized track takes a share of the remaining space in proportion to its flex factor.

When appearing outside a minmax() notation, it implies an automatic minimum (i.e. minmax(auto, <flex>)).

max-content
Is a keyword representing the largest maximal content contribution of the grid items occupying the grid track.
min-content
Is a keyword representing the largest minimal content contribution of the grid items occupying the grid track.
minmax(min, max)
Is a functional notation that defines a size range greater than or equal to min and less than or equal to max. If max is smaller than min, then max is ignored and the function is treated as min. As a maximum, a <flex> value sets the track’s flex factor. As a minimum, it is treated as zero (or minimal content, if the grid container is sized under a minimal content constraint).
fit-content( [ <length> | <percentage> ] )
Represents the formula min(max-content, max(auto, argument)), which is calculated similar to auto (i.e. minmax(auto, max-content)), except that the track size is clamped at argument if it is greater than the auto minimum.
auto
Is a keyword that is identical to maximal content if it's a maximum. As a minimum it represents the largest minimum size (as specified by min-width/min-height) of the grid items occupying the grid track.

Note: auto track sizes (and only auto track sizes) can be streched by the align-content and justify-content properties.

Formal definition

Initial value auto
Applies to grid containers
Inherited no
Percentages refer to corresponding dimension of the content area
Computed value the percentage as specified or the absolute length
Animation type discrete

Formal syntax

<track-size>+

where
<track-size> = <track-breadth> | minmax( <inflexible-breadth> , <track-breadth> ) | fit-content( [ <length> | <percentage> ] )

where
<track-breadth> = <length-percentage> | <flex> | min-content | max-content | auto
<inflexible-breadth> = <length> | <percentage> | min-content | max-content | auto

where
<length-percentage> = <length> | <percentage>

Examples

Setting grid column size

HTML

<div id="grid">
  <div id="item1"></div>
  <div id="item2"></div>
  <div id="item3"></div>
</div>

CSS

#grid {
  height: 100px;
  display: grid;
  grid-template-areas: "a a";
  gap: 10px;
  grid-auto-columns: 200px;
}

#grid > div {
  background-color: lime;
}

Result

Specifications

Specification Status Comment
CSS Grid Layout
The definition of 'grid-auto-columns' in that specification.
Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
grid-auto-columns 57
57
29
Disabled
Disabled From version 29: this feature is behind the Enable experimental Web Platform features preference. To change preferences in Chrome, visit chrome://flags.
16
16
12
Uses the non-standard name: -ms-grid-columns
70
70
52 — 70
Does not accept multiple track-size values. See bug 1339672.
40 — 59
Disabled
Does not accept multiple track-size values. See bug 1339672.
Disabled From version 40 until version 59 (exclusive): this feature is behind the layout.css.grid.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
10
10
Uses the non-standard name: -ms-grid-columns
44
44
28
Disabled
Disabled From version 28: this feature is behind the Enable experimental Web Platform features preference.
10.1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
grid-auto-columns 57 57
57
29
Disabled
Disabled From version 29: this feature is behind the Enable experimental Web Platform features preference. To change preferences in Chrome, visit chrome://flags.
52
52
Does not accept multiple track-size values. See bug 1339672.
40 — 59
Disabled
Does not accept multiple track-size values. See bug 1339672.
Disabled From version 40 until version 59 (exclusive): this feature is behind the layout.css.grid.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
43
43
28
Disabled
Disabled From version 28: this feature is behind the Enable experimental Web Platform features preference.
10.3 6.0

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/grid-auto-columns