CSS - box-align

Example

HTML

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<!DOCTYPE html>
<html>
<head>
<title>CSS box-align example</title>
<style>
div.example {
  display: box;                   /* As specified */
  display: -moz-box;              /* Mozilla */
  display: -webkit-box;           /* WebKit */
	
  /* Make this box taller than the children, 
     so there is room for the box-pack */
  height: 400px;           
	
  /* Make this box wider than the children
     so there is room for the box-align */
  width: 300px;

  /* Children should be oriented vertically */
  box-orient: vertical;           /* As specified */
  -moz-box-orient: vertical;      /* Mozilla */
  -webkit-box-orient: vertical;   /* WebKit */

  /* Align children to the horizontal center of this box */
  box-align: center;              /* As specified */
  -moz-box-align: center;         /* Mozilla */
  -webkit-box-align: center;      /* WebKit */
	
  /* Pack children to the bottom of this box */
  box-pack: end;                  /* As specified */
  -moz-box-pack: end;             /* Mozilla */
  -webkit-box-pack: end;          /* WebKit */
}

div.example > p {            
  /* Make children narrower than their parent, 
     so there is room for the box-align */ 
  width: 200px;
}
</style>
</head>
<body>
  <div class="example">
    <p>I will be second from the bottom of div.example, centered horizontally.</p>
    <p>I will be on the bottom of div.example, centered horizontally.</p>
  </div>
</body>
</html>

Syntax

CSS

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start <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> center <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> end <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> baseline <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> stretch

Values

start: The box aligns contents at the start, leaving any extra space at the end.
center: The box aligns contents in the center, dividing any extra space equally between the start and the end.
end: The box aligns contents at the end, leaving any extra space at the start.
baseline: The box aligns the baselines of the contents (lining up the text). This only applies if the box's orientation is horizontal.
stretch: The box stretches the contents so that there is no extra space in the box.

Description

The CSS box-align property specifies how an element aligns its contents across (perpendicular to) the direction of its layout. The effect of this is only visible if there is extra space in the box. See Flexbox for more about the properties of flexbox elements.

The direction of layout depends on the element's orientation: horizontal or vertical.

Initial value	`stretch`
Applies to	elements with a CSS `display` value of `box` or `inline-box`
Inherited	no
Media	visual
Computed value	as specified
Animatable	no
Canonical order	the unique non-ambiguous order defined by the formal grammar

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	(Yes)-webkit	(Yes)-moz^[1]	No support	(Yes)-webkit	1.1-khtml 3.0-webkit

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	?	?	?	No support	?	1.0-webkit

[1] In addition to the -moz prefixed support, Gecko 48.0 (Firefox 48.0 / Thunderbird 48.0 / SeaMonkey 2.45) added support for a -webkit prefixed version of the property for web compatibility reasons behind the preference layout.css.prefixes.webkit, defaulting to false. Since Gecko 49.0 (Firefox 49.0 / Thunderbird 49.0 / SeaMonkey 2.46) the preference defaults to true.

Notes

The edge of the box designated the start for alignment purposes depends on the box's orientation:

Horizontal	top
Vertical	left

The edge opposite to the start is designated the end.

If the alignment is set using the element's align attribute, then the style is ignored.

Specifications

Flexible Box Layout Module (W3C Working Draft)
Note: The current state of this specification does not reflect Mozilla's or WebKit's implementation.
Old Flexible Box Layout Module
Note: WebKit and Mozilla's implementations reflect this version of the specification

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/css/box-align

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