border-block-start-color

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.

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Syntax

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

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'>

See border-color

Formal definition

Formal syntax

<'border-top-color'>

Examples

Border color 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-start-color: red;
}

Results

Specifications

Browser compatibility

See also

• This property maps to one of the physical border properties: border-top-color, border-right-color, border-bottom-color, or border-left-color.
• writing-mode, direction, text-orientation