border-block-start-color

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

The border-block-start-color CSS property defines the color of the logical block-start border 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, border-right-color, border-bottom-color, or border-left-color property depending on the values defined for writing-mode, direction, and text-orientation.

Try it

Syntax

css
border-block-start-color: blue;
border-block-start-color: #4c5d21;

/* Global values */
border-block-start-color: inherit;
border-block-start-color: initial;
border-block-start-color: revert;
border-block-start-color: revert-layer;
border-block-start-color: unset;

Related properties are border-block-end-color, border-inline-start-color, and border-inline-end-color, which define the other border colors of the element.

Values

<color>

The color of the border.

Formal definition

Initial valuecurrentcolor
Applies toall elements
Inheritedno
Computed valuecomputed color
Animation typeby computed value type

Formal syntax

border-block-start-color = 
  <color>     |
  <image-1D>  

<image-1D> = 
  <stripes()>  

<stripes()> = 
  stripes( <color-stripe># )  

<color-stripe> = 
  <color>                            &&
  [ <length-percentage> | <flex> ]?  

<length-percentage> = 
  <length>      |
  <percentage>

Examples

Border color with vertical text

HTML

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

CSS

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

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

Results

Specifications

Specification
CSS Logical Properties and Values Level 1
# border-color

Browser compatibility

BCD tables only load in the browser

See also