Warning: This is a property of the original CSS Flexible Box Layout Module standard which is being replaced by a new standard.
See Flexbox for more information.
Summary
The -moz-box-pack
and -webkit-box-pack
CSS properties specify how a -moz-box
or -webkit-box
packs its contents in 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 | start |
---|---|
Applies to | elements with a CSS display value of -moz-box , -moz-inline-box , -webkit-box or -webkit-inline-box |
Inherited | no |
Media | visual |
Computed value | as specified |
Animatable | no |
Canonical order | the unique non-ambiguous order defined by the formal grammar |
Syntax
/* Keyword values */ box-pack: start; box-pack: center; box-pack: end; box-pack: justify; /* Global values */ box-pack: inherit; box-pack: initial; box-pack: unset;
Values
start
- The box packs contents at the start, leaving any extra space at the end.
center
- The box packs contents in the center, dividing any extra space equally between the start and the end.
end
- The box packs contents at the end, leaving any extra space at the start.
justify
- The space is divided evenly in-between each child, with none of the extra space placed before the first child or after the last child. If there is only one child, treat the value as if it were
start
.
Formal syntax
start | center | end | justify
Examples
div.example { border-style: solid; display: -moz-box; /* Mozilla */ display: -webkit-box; /* WebKit */ /* Make this box taller than the children, so there is room for the box-pack */ height: 300px; /* Make this box wide enough to show the contents are centered horizontally */ width: 300px; /* Children should be oriented vertically */ -moz-box-orient: vertical; /* Mozilla */ -webkit-box-orient: vertical; /* WebKit */ /* Align children to the horizontal center of this box */ -moz-box-align: center; /* Mozilla */ -webkit-box-align: center; /* WebKit */ /* Pack children to the bottom of this box */ -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; }
<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>
Notes
The edge of the box designated the start for packing purposes depends on the box's orientation and direction:
Normal | Reverse | |
---|---|---|
Horizontal | left | right |
Vertical | top | bottom |
The edge opposite to the start is designated the end.
If the packing is set using the element's pack
attribute, then the style is ignored.
Specifications
This property is non-standard, though a similar property appeared in an early draft of CSS3 Flexbox, which has been superseded in newer versions of the specification.
Browser compatibility
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 | ? | ? | (Yes)-moz[1] | 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
.