grid-auto-rows

The grid-auto-rows CSS property specifies the size of an implicitly-created grid row track.

/* Keyword values */
grid-auto-rows: min-content;
grid-auto-rows: max-content;
grid-auto-rows: auto;
/* <length> values */
grid-auto-rows: 100px;
grid-auto-rows: 20cm;
grid-auto-rows: 50vmax;
/* <percentage> values */
grid-auto-rows: 10%;
grid-auto-rows: 33.3%;
/* <flex> values */
grid-auto-rows: 0.5fr;
grid-auto-rows: 3fr;
/* minmax() values */
grid-auto-rows: minmax(100px, auto);
grid-auto-rows: minmax(max-content, 2fr);
grid-auto-rows: minmax(20%, 80vmax);
/* multiple track-size values */
grid-auto-rows: min-content max-content auto;
grid-auto-rows: 100px 150px 390px;
grid-auto-rows: 10% 33.3%;
grid-auto-rows: 0.5fr 3fr 1fr;
grid-auto-rows: minmax(100px, auto) minmax(max-content, 2fr) minmax(20%, 80vmax);
grid-auto-rows: 100px minmax(100px, auto) 10% 0.5fr fit-content(400px);
/* Global values */
grid-auto-rows: inherit;
grid-auto-rows: initial;
grid-auto-rows: unset;

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

Initial value	`auto`
Applies to	grid containers
Inherited	no
Percentages	refer to corresponding dimension of the content area
Media	visual
Computed value	the percentage as specified or the absolute length
Animation type	discrete
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

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).
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 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>

Example

HTML Content

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

CSS Content

#grid {
  width: 200px;
  display: grid;
  grid-template-areas: "a a";
  grid-gap: 10px;
  grid-auto-rows: 100px;
}
#grid > div {
  background-color: lime;
}

Specifications

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

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Edge	Opera	Safari
Basic support	57.0^[1]	52.0 (52.0)^[2]	10.0-ms^[3]	20-ms^[3]	44^[4]	No support^[5]

Feature	Android Webview	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	57.0^[1]	57.0^[1]	52.0 (52.0)^[2]	10.0-ms^[3]	44	No support

[1] Implemented behind the experimental Web Platform features flag in chrome://flags since Chrome 29.0.

[2] Implemented behind the preference layout.css.grid.enabled since Gecko 40.0 (Firefox 40.0 / Thunderbird 40.0 / SeaMonkey 2.37), defaulting to false. Since Gecko 52.0 (Firefox 52.0 / Thunderbird 52.0 / SeaMonkey 2.49) it is enabled by default.

[3] Internet Explorer implements an older version of the specification using the -ms prefix. Therefore the property is implemented there as -ms-grid-rows.

[4] Implemented behind the Enable experimental Web Platform features flag in chrome://flags since Opera 28.0.

[5] Experimental implementation available in Safari Technological Preview.