border-block-color

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The border-block-color CSS property defines the color of the logical block borders of an element, which maps to a physical border color depending on the element's writing mode, directionality, and text orientation. It corresponds to the border-top-color and border-bottom-color, or border-right-color and border-left-color property depending on the values defined for writing-mode, direction, and text-orientation.

border-block-color: yellow;
border-block-color: #F5F6F7;

The border color in the other dimension can be set with border-inline-color which sets border-inline-start-color, and border-inline-end-color.

Syntax

Values

<'color'>
The color of the border. See color.

Formal definition

Initial valuecurrentcolor
Applies toall elements
Inheritedno
Computed valuecomputed color
Animation typediscrete

Formal syntax

<'border-top-color'>{1,2}

Examples

Border with vertical text

HTML

<div>
  <p class="exampleText">Example text</p>
</div>

CSS

div {
  background-color: yellow;
  width: 120px;
  height: 120px;
}

.exampleText {
  writing-mode: vertical-lr;
  border: 10px solid blue;
  border-block-color: red;
}

Results

Specifications

Specification Status Comment
CSS Logical Properties and Values Level 1
The definition of 'border-block-color' in that specification.
Editor's Draft Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
border-block-colorChrome Full support 69
Disabled
Full support 69
Disabled
Disabled From version 69: this feature is behind the Experimental Web Platform Features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.
Edge Full support 79
Disabled
Full support 79
Disabled
Disabled From version 79: this feature is behind the Experimental Web Platform Features preference (needs to be set to enabled).
Firefox Full support 66IE No support NoOpera Full support 56
Disabled
Full support 56
Disabled
Disabled From version 56: this feature is behind the Experimental Web Platform Features preference (needs to be set to enabled).
Safari No support NoWebView Android No support NoChrome Android Full support 69
Disabled
Full support 69
Disabled
Disabled From version 69: this feature is behind the Experimental Web Platform Features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.
Firefox Android Full support 66Opera Android Full support 48
Disabled
Full support 48
Disabled
Disabled From version 48: this feature is behind the Experimental Web Platform Features preference (needs to be set to enabled).
Safari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
User must explicitly enable this feature.
User must explicitly enable this feature.

See also