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The column-rule-width CSS property lets you set the width of the rule drawn between columns in multi-column layouts.

/* Keyword values */
column-rule-width: thin;
column-rule-width: medium;
column-rule-width: thick;

/* Length values */
column-rule-width: 1px;
column-rule-width: 2.5em;

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

Initial valuemedium
Applies tomulticol elements
Computed valuethe absolute length; 0 if the column-rule-style is none or hidden
Animation typea length
Canonical orderper grammar


A single <br-width> value.


Is a <length> or one of the thin, medium or thick keyword describing the width of the rule separating two columns.

Formal syntax



#header {
  column-rule-width: thick;


Specification Status Comment
CSS Multi-column Layout Module
The definition of 'column-rule-width' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes)-webkit
(Yes)-webkit 3.5 (1.9.1)-moz
50.0 (50.0)[2]
10 11.10 3.0 (522)-webkit
Feature Android Android Webview Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support ? ?
(Yes)-webkit (Yes)
50.0 (50.0)[2]
? ? ? ?

[1]  Unprefixed as of Chrome 50.

[2] Unprefixed as of Gecko 52, with prefixed aliases still available.