The column-width CSS property specifies the minimum column width. The number of columns will be the maximum number of columns that can fit without any column having a width less than the column-width value. The actual column width may be smaller than the value of column-width if the width of the container is smaller.

/* Keyword value */
column-width: auto;

/* Different <length> values */
column-width: 6px;
column-width: 25em;
column-width: 0.3vw;

/* Global values */
column-width: inherit;
column-width: initial;
column-width: unset;

This allows you to achieve scalable designs that fit different screen sizes. Especially in presence of the column-count CSS property which has precedence, to set an exact column width, all length values must be specified. In horizontal text these are width, column-width, column-gap, and column-rule-width.

Initial valueauto
Applies toBlock containers except table wrapper boxes
Inheritedno
Mediavisual
Computed valuethe absolute length, zero or larger
Animation typea length
Canonical orderper grammar

Syntax

Values

<length>
Is a <length> value giving a hint of the optimal width of the column. The actual column width may be wider (to fill the available space), or narrower (only if the available space is smaller than the specified column width). The length must be strictly positive or the declaration is invalid.
auto
Is a keyword indicating that the width of the column should be determined by other CSS properties, like column-count.

Formal syntax

<length> | auto

Examples

HTML Content

<div class="content-box">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.
</div>

CSS Content

.content-box {
  border: 10px solid #0ff;

  /* Chrome, Safari, Opera prefix */
  -webkit-column-width: 100px;

  /* Mozilla Firefox prefix */
  -moz-column-width: 100px;

  column-width: 100px;
}

Specifications

Specification Status Comment
CSS Writing Modes Module Level 3
The definition of 'column-width' in that specification.
Candidate Recommendation Adds intrinsic sizes via the keywords min-content, max-content, fill-available and fit-content.
CSS Multi-column Layout Module
The definition of 'column-width' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

50

Yes -webkit-

Yes

Yes -webkit-

50

1.5 -moz-

1011.13 -webkit-
Intrinsic sizes No ? No No No No
On display: table-caption Yes Yes37 Yes Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic support Yes

50

Yes -webkit-

Yes

Yes -webkit-

50

1 -moz-

Yes Yes Yes
Intrinsic sizes No ? ? No No No No
On display: table-caption Yes50 Yes37 Yes Yes Yes