The border-right-width CSS property sets the width of the right border of a box.

Syntax

/* Keyword values */
border-right-width: thin;
border-right-width: medium;
border-right-width: thick;

/* <length> values */
border-right-width: 10em;
border-right-width: 3vmax;
border-right-width: 6px;

/* Global keywords */
border-right-width: inherit;
border-right-width: initial;
border-right-width: unset;

Values

<line-width>
Defines the width of the border, either as an explicit nonnegative <length> or a keyword. If it's a keyword, it must be one of the following values:
thin
 
A thin border
medium
 
A medium border
thick
 
A thick border

Note: Because the specification doesn't define the exact thickness denoted by each keyword, the precise result when using one of them is implementation-specific. Nevertheless, they always follow the pattern thin ≤ medium ≤ thick, and the values are constant within a single document.

Formal syntax

<line-width>

where
<line-width> = <length> | thin | medium | thick

Example

HTML

<div>Element 1</div>
<div>Element 2</div>

CSS

div { 
  border: 1px solid red;
  margin: 1em 0;
}

div:nth-child(1) {
  border-right-width: thick;
}
div:nth-child(2) {
  border-right-width: 2em;
}

Result

Specifications

Specification Status Comment
CSS Backgrounds and Borders Module Level 3
The definition of 'border-right-width' in that specification.
Candidate Recommendation No significant change.
CSS Level 2 (Revision 1)
The definition of 'border-right-width' in that specification.
Recommendation No significant change.
CSS Level 1
The definition of 'border-right-width' in that specification.
Recommendation Initial definition.

Initial valuemedium
Applies toall elements. It also applies to ::first-letter.
Inheritedno
Mediavisual
Computed valuethe absolute length or 0 if border-right-style is none or hidden
Animation typea length
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 3.5Safari Full support 1WebView Android Full support 2.3Chrome Android ? Edge Mobile Full support YesFirefox Android Full support 4Opera Android Full support 11Safari iOS Full support 1Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Last updated by: mfuji09,