The align-self CSS property aligns flex items of the current flex line overriding the align-items value. If any of the item's cross-axis margin is set to auto, then align-self is ignored.

The property doesn't apply to block-level boxes, or to table cells.

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 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

Example

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.

Initial valueauto
Applies toflex items, grid items, and absolutely-positioned boxes
Inheritedno
Mediavisual
Computed valueauto 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 typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Browser compatibility

 

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

36

291

21 -webkit-

12

202

18 — 203

49 -webkit-

48 -webkit- 4

1112.1 No
start and end ? ? Yes ? ? ?
left and right ? ?52 ? ? ?
baseline ? ? Yes ? ? ?
first baseline and last baseline ? ?52 ? ? ?
stretch ? ?52 ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support

36

291

21 -webkit-

36

291

21 -webkit-

Yes

Yes -webkit-

Yes No No ?
start and end ? ? ? ? ? ? ?
left and right ? ? ?52 ? ? ?
baseline ? ? ? Yes ? ? ?
first baseline and last baseline ? ? ?52 ? ? ?
stretch ? ? ?52 ? ? ?

1. 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.

2. Before Firefox 27, only single-line flexbox is supported.

3. 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.

4. 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.

 

See also

 

Document Tags and Contributors

Last updated by: rachelandrew,