column-rule

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2017.

The column-rule shorthand CSS property sets the width, style, and color of the line drawn between columns in a multi-column layout.

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Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

css
column-rule: dotted;
column-rule: solid 8px;
column-rule: solid blue;
column-rule: thick inset blue;

/* Global values */
column-rule: inherit;
column-rule: initial;
column-rule: revert;
column-rule: revert-layer;
column-rule: unset;

Values

The column-rule property is specified as one, two, or three of the values listed below, in any order.

<'column-rule-width'>

Is a <length> or one of the three keywords, thin, medium, or thick. See border-width for details.

<'column-rule-style'>

See border-style for possible values and details.

<'column-rule-color'>

Is a <color> value.

Formal definition

Initial valueas each of the properties of the shorthand:
Applies tomulticol elements
Inheritedno
Computed valueas each of the properties of the shorthand:
Animation typeas each of the properties of the shorthand:

Formal syntax

column-rule = 
  <gap-rule-list>       |
  <auto-gap-rule-list>  

<gap-rule-list> = 
  <gap-rule-or-repeat> [ / <gap-rule-or-repeat> ]*  

<auto-gap-rule-list> = 
  [ [ <gap-rule-or-repeat> ] / ]* <auto-repeat-gap-rule> [ / [ <gap-rule-or-repeat> ] ]*  

<gap-rule-or-repeat> = 
  <gap-rule>         |
  <repeat-gap-rule>  

<auto-repeat-gap-rule> = 
  repeat( auto , [ <gap-rule> ]# )  

<gap-rule> = 
  <line-width>  ||
  <line-style>  ||
  <color>       

<repeat-gap-rule> = 
  repeat( [ <integer [1,∞]> ] , [ <gap-rule> ]# )  

<line-width> = 
  <length [0,∞]>  |
  thin            |
  medium          |
  thick           

<line-style> = 
  none    |
  hidden  |
  dotted  |
  dashed  |
  solid   |
  double  |
  groove  |
  ridge   |
  inset   |
  outset

Examples

Example 1

css
/* Same as "medium dotted currentcolor" */
p.foo {
  column-rule: dotted;
}

/* Same as "medium solid blue" */
p.bar {
  column-rule: solid blue;
}

/* Same as "8px solid currentcolor" */
p.baz {
  column-rule: solid 8px;
}

p.abc {
  column-rule: thick inset blue;
}

Example 2

HTML

html
<p class="content-box">
  This is a bunch of text split into three columns. Take note of how the
  `column-rule` property is used to adjust the style, width, and color of the
  rule that appears between the columns.
</p>

CSS

css
.content-box {
  padding: 0.3em;
  background: #ff7;
  column-count: 3;
  column-rule: inset 2px #33f;
}

Result

Specifications

Specification
CSS Multi-column Layout Module Level 1
# column-rule

Browser compatibility

BCD tables only load in the browser

See also