`border-inline-start-color` CSS property

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-inline-start-color CSS property defines the color of the logical inline 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

border-inline-start-color: red;
writing-mode: horizontal-tb;

border-inline-start-color: #32a1ce;
writing-mode: vertical-rl;

border-inline-start-color: rgb(170 50 220 / 0.6);
writing-mode: horizontal-tb;
direction: rtl;

<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box with a border around it.
  </div>
</section>

#example-element {
  background-color: #eeeeee;
  color: black;
  border: 0.75em solid;
  padding: 0.75em;
  width: 80%;
  height: 100px;
  unicode-bidi: bidi-override;
}

Syntax

border-inline-start-color: red;
border-inline-start-color: #ee4141;

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

Related properties are border-block-start-color, border-block-end-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 value	currentcolor
Applies to	all elements
Inherited	no
Computed value	computed color
Animation type	by computed value type

Formal syntax

border-inline-start-color = 
  <'border-top-color'>

Examples

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-inline-start-color: red;
}

Specifications

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

Browser compatibility

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`border-inline-start-color`	69	79	41 3	56	12.1	69	41 4	48	12.2	10.0	69	12.2
`currentColor`	69	79	41	56	12.1	69	41	48	12.2	10.0	69	12.2
`transparent`	69	79	41	56	12.1	69	41	48	12.2	10.0	69	12.2