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align-self

The align-self CSS property overrides a grid or flex item's align-items value. In Grid, it aligns the item inside the grid area. In Flexbox, it aligns the item on the cross axis.

The property doesn't apply to block-level boxes, or to table cells. If a flexbox item's cross-axis margin is auto, then align-self is ignored.

Syntax

/* Keyword values */ 
align-self: auto; 
align-self: normal; 

/* Positional alignment */ 
/* align-self does not take left and right values */
align-self: center; /* Put the item around the center */ 
align-self: start; /* Put the item at the start */ 
align-self: end; /* Put the item at the end */ 
align-self: self-start; /* Align the item flush at the start */ 
align-self: self-end; /* Align the item flush at the end */ 
align-self: flex-start; /* Put the flex item at the start */ 
align-self: flex-end; /* Put the flex item at the end */ 

/* Baseline alignment */ 
align-self: baseline; 
align-self: first baseline; 
align-self: last baseline; 
align-self: stretch; /* Stretch 'auto'-sized items to fit the container */ 

/* Overflow alignment */ 
align-self: safe center; 
align-self: unsafe center; 

/* Global values */ 
align-self: inherit; 
align-self: initial; 
align-self: unset;

Values

auto
Computes to the parent's align-items value.
normal
The effect of this keyword is dependent of the layout mode we are in:
  • In absolutely-positioned layouts, the keyword behaves like start on replaced absolutely-positioned boxes, and as stretch on all other absolutely-positioned boxes.
  • In static position of absolutely-positioned layouts, the keyword behaves as stretch.
  • For flex items, the keyword behaves as stretch.
  • For grid items, this keyword leads to a behavior similar to the one of stretch, except for boxes with an aspect ratio or an intrinsic sizes where it behaves like start.
  • The property doesn't apply to block-level boxes, and to table cells.
self-start
Aligns the items to be flush with the edge of the alignment container corresponding to the item's start side in the cross axis.
self-end
Aligns the items to be flush with the edge of the alignment container corresponding to the item's end side in the cross axis.
flex-start
The cross-start margin edge of the flex item is flushed with the cross-start edge of the line.
flex-end
The cross-end margin edge of the flex item is flushed with the cross-end edge of the line.
center
The flex item's margin box is centered within the line on the cross-axis. If the cross-size of the item is larger than the flex container, it will overflow equally in both directions.
baseline
first baseline

last baseline
Specifies participation in first- or last-baseline alignment: aligns the alignment baseline of the box’s first or last baseline set with the corresponding baseline in the shared first or last baseline set of all the boxes in its baseline-sharing group.
The fallback alignment for first baseline is start, the one for last baseline is end.
stretch
If the combined size of the items along the cross axis is less than the size of the alignment container and the item is auto-sized, its size is increased equally (not proportionally), while still respecting the constraints imposed by max-height/max-width (or equivalent functionality), so that the combined size of all auto-sized items exactly fills the alignment container along the cross axis.
safe
If the size of the item overflows the alignment container, the item is instead aligned as if the alignment mode were start.
unsafe
Regardless of the relative sizes of the item and alignment container, the given alignment value is honored.

Formal definition

Initial value auto
Applies to flex items, grid items, and absolutely-positioned boxes
Inherited no
Computed value auto computes to itself on absolutely-positioned elements, and to the computed value of align-items on the parent (minus any legacy keywords) on all other boxes, or start if the box has no parent. Its behavior depends on the layout model, as described for justify-self. Otherwise the specified value.
Animation type discrete

Formal syntax

auto | normal | stretch | <baseline-position> | <overflow-position>? <self-position>

where
<baseline-position> = [ first | last ]? baseline
<overflow-position> = unsafe | safe
<self-position> = center | start | end | self-start | self-end | flex-start | flex-end

Examples

HTML

<section>
  <div>Item #1</div>
  <div>Item #2</div>
  <div>Item #3</div>
</section>

CSS

section {
  display: flex;
  align-items: center;
  height: 120px;
  background: beige;
}

div {
  height: 60px;
  background: cyan;
  margin: 5px;
}

div:nth-child(3) {
  align-self: flex-end;
  background: pink;
}

Result

Specifications

Specification Status Comment
CSS Box Alignment Module Level 3
The definition of 'align-self' in that specification.
Working Draft Update to latest syntax definitions.
CSS Flexible Box Layout Module
The definition of 'align-self' in that specification.
Candidate Recommendation Initial definition.

Browser compatibilityUpdate compatibility data on GitHubUpdate compatibility data on GitHub

Support in Flex layout

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Supported in Flex Layout 36
36
29
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
21
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
12 20
20
Before Firefox 27, only single-line flexbox is supported.
18 — 20
Disabled
Disabled From version 18 until version 20 (exclusive): this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
48
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 48: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
11 12.1 9
9
6.1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
baseline 57 79 45 No 44 No
first baseline and last baseline 57 79 52 No 44 No
left and right No No 52 No No No
safe and unsafe No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
63 No No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
start and end 57 79 45 No 44 No
stretch 57 79 52 No 44 No
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Supported in Flex Layout 37
37
4.4
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
≤37
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
36
36
29
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
25
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
20
20
Before Firefox 27, only single-line flexbox is supported.
18 — 20
Disabled
Disabled From version 18 until version 20 (exclusive): this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
48
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 48: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
12.1 9
9
6.1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
3.0
3.0
2.0
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Samsung Internet 6.0.
1.5
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
baseline 57 57 45 43 No 7.0
first baseline and last baseline 57 57 52 43 No 7.0
left and right No No 52 No No No
safe and unsafe No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
63 No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
start and end 57 57 45 43 No 7.0
stretch 57 57 52 43 No 7.0

Support in Grid layout

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Supported in Grid Layout 57 16 52 10
Prefixed
10
Prefixed
Prefixed Implemented with the vendor prefix: -ms-
Internet Explorer 10 and 11 have the property -ms-grid-row-align, which acts in a similar way to align-self.
44 10.1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Supported in Grid Layout 57 52 52 43 10.3 6.2

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/align-self