border-block-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-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.

Try it

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

css
border-block-color: yellow;
border-block-color: #f5f6f7;

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

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

<border-top-color> =
<color> |
<image-1D>

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

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

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

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

Examples

Border 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-color: red;
}

Results

Specifications

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

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
border-block-color

Legend

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Full support
Full support

See also