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

Try it

border-block-start-width: thick;
writing-mode: horizontal-tb;

border-block-start-width: thick;
writing-mode: vertical-rl;

border-block-start-width: 4px;
writing-mode: horizontal-tb;

border-block-start-width: 4px;
writing-mode: vertical-lr;

<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: palegreen;
  color: black;
  border: 0 solid crimson;
  padding: 0.75em;
  width: 80%;
  height: 100px;
  unicode-bidi: bidi-override;
}

Syntax

/* <'line-width'> values */
border-block-start-width: 5px;
border-block-start-width: thick;

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

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

Values

<line-width>: Defines the width of the border, either as an explicit non-negative <length> or the keywords: thin, medium, or thick. The default is medium.

Formal definition

Initial value	medium
Applies to	all elements
Inherited	no
Computed value	the absolute `<length>`, snapped as a line width
Animation type	by computed value type

Formal syntax

border-block-start-width = 
  <'border-top-width'>

Examples

Border width 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: 1px solid blue;
  border-block-start-width: 5px;
}

Results

Specifications

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

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-block-start-width`	69	79	41	56	12.1	69	41	48	12.2	10.0	69	12.2
`medium`	69	79	41	56	12.1	69	41	48	12.2	10.0	69	12.2
`thick`	69	79	41	56	12.1	69	41	48	12.2	10.0	69	12.2
`thin`	69	79	41	56	12.1	69	41	48	12.2	10.0	69	12.2