box-pack

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Warning: This is a property of the original CSS Flexible Box Layout Module draft, and has been replaced by a newer standard. See flexbox for information about the current standard.

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.

/* 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;

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

Syntax

The box-pack property is specified as one of the keyword values listed below.

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.

Notes

The edge of the box designated the start for packing purposes depends on the box's orientation and direction:

  • For horizontal elements, the start is the top edge.
  • For vertical elements, the start is the left edge.
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.

Formal definition

Initial valuestart
Applies toelements with a CSS display value of -moz-box, -moz-inline-box, -webkit-box or -webkit-inline-box
Inheritedno
Computed valueas specified
Animation typediscrete

Formal syntax

start | center | end | justify

Examples

Examples of box-pack

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>

Specifications

Not part of any standard.

Browser compatibility

BCD tables only load in the browser

See also