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

  • Initial value medium
  • Applies to multicol elements
  • Inherited no
  • Media visual
  • Computed value an absolute length; 0 if the column rule style is none or hidden
  • Animatable yes, as a length
  • Canonical order the unique non-ambiguous order defined by the formal grammar


/* 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;


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

Formal syntax


<br-width> = <length> | thin | medium | thick


#header {
  column-rule-width: thick;


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes)-webkit 3.5 (1.9.1)-moz 10 11.1 3.0 (522)-webkit
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? (Yes) ? ? ?

See also

Document Tags and Contributors

Last updated by: Sebastianz,